1973 Honda CB750 Tank Dent vs Inner Tube
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- Опубликовано: 27 авг 2024
- 1973 Honda CB750 Tank Dent vs Inner Tube #Honda CB750 #cb750 #vintagemotorcycles
Welcome to our latest video where we attempt to repair a dent on the gas tank of a 1973 Honda CB750 using a paintless dent repair technique. In this video, we take you through our process of trying to push the dent out from the inside using an inner tube, and then using a rod and hammer to work on the dent.
While we did not achieve a perfect result, we were able to make some improvements to the dent, making it better than before. Along the way, we also had some fun trying out different techniques and tools to see what works best.
If you're interested in learning more about paintless dent repair and seeing how we tackled this particular dent, then be sure to watch the full video. Whether you're a seasoned mechanic or just someone who enjoys working on classic motorcycles, there's sure to be something in this video that you'll find interesting. So sit back, relax, and join us as we attempt to beat this dent into submission!
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The best way is to fill it with water and put it in a freezer... you will have to do that several times, but it does work!
That sounds like fun. I have another dented tank may have to give it a shot. 😂🤣😂 Thanks for watching
@@motorcyclerewind OH, I got to see this!! Doooo IT! 😉😉
Ratchet strap for tank, Shut the gas cap and blow air in the pet cock,
I was just going to make that comment! 👍
This idea wins the budweiser real men of genius award. great idea Mike.
Ahhhh love the sound of a bike tank scraping across bare concrete😳🫣
Thanks for watching.
Funny I was thinking the same thing !
my fav part as well
I had to leave. maybe next time.
Haha! I was cringing!
I used a blood pressure cuff with a squeeze bulb. Worked fine on my 1978 Honda 750. Easier to control where it is pushing. Saw it demonstrated on a RUclips video. Great for a tank that you don't want to re paint. Yes finished of the job with a short wooden broomstick handle. Most people would never know that the tank had been dented...
That’s a great idea. Thanks for sharing.
Went to a high end shop in Santa Cruz bitd for a tank dent. He went to his tool box and dropped in a lady fingers firecracker after water rinse. Worked great that particular dent. He joked about having only a few firecrackers left. Me and my friend brought him some to fill the one particular drawer. This was in late 80’s.
Sound like I need to go firework shopping this July 4th.
👀 as longʻ as there's no trace of fuel...
Yeah
Always remove gas and vapors
I love hare-brained schemes like this.....I must; I've engaged in a whole bunch of them.....and I have the scars. I have even put water into dirt bike expansion chambers and put in a chest deepfreeze to push out dents. Great video!! P.S. ALWAYS keep your leg under the tank when you drop it at speed on the highway!!! LOL.
Glad to hear from another “hare brain” 😂 Great minds think alike. Thanks for watching
I agree with last posters put a peice of rope around the tube .an the pump it up after you warmed the tank up as hot as you cani did the same thing on my tanki filled it with very hot water then pumped it up also heat gun it pushed the hot water out but it kept it warm to pop out dents . Even ones i didnt notice .After i done the tank a part on the bottom (where your nuts go) was a lot smoother i just thought it was supposed to be like that .
That’s a great idea. I am going try some heat with the next one. Need to find a dented tank.
When we used to pressurise our tanks back in the day, the trick was to use a 27" mountain bike tube. You fill it to thr point where the tank is under pressure, and tap the edges of the dent with a nylon hammer. It pops out gradually as you tap and add pressure. Its not meant to pop the dent, just put some force on the inside to work with. The bike tube comes out easy too.
Using a smaller tube would have been better. Thanks for sharing.
I had a brown K3 just like that. I bought it new for $1,550. I remember when they did the push button latch recall for the key latch. It sure brings back memories of the good ole days. Thanks.
Thanks for watching.
Very cool! I found it difficult to place the tube exactly where needed. You definitely had a firm dent so perfection can't be the goal but nothing ventured nothing gained!
Shooting in the dark, hoping the tube is in the right place. You’re right not looking for perfect just better. Thanks for watching.
I had a friend call and say he was yelling at his phone to put some soap on the inner tube to help putting it in. That would've helped sooner! 😀
I’ve never heard of the innertube trick. Worth a try. I just had my pdr guy do a tank for me so I could minimize the paint area.
Didn’t think I could make it worse. I have a PDR kit and may use it later to get out some of the dings. Thanks for watching. I really appreciate it!
I've seen videos of people using basketballs to push dents out on car panels
That will fix the dent
I agree that better is good. Doesn't have to be perfect just better than before. I fix what jumps out at me first.
I worked with a guy who said he filled his dented tank with water, sealed it up then put it on a campfire. He said it exploded with a ruptured seam, flew through the air like a missile, then landed on one of those farming, tilling things with all the disks, destroying what was left of the tank. It was quite a story! Lol.
As long as it’s better than where we started I’m good. Wow on the campfire tank missile. Thanks for watching.
Well worth a try nice one.
Thanks for watching
@@motorcyclerewind blood pressure cuff works well or plastic bottle
The inner tube was a good idea. If you had used your body hammer or PDR tools around the perimeter of the dent while under pressure it may have gotten you a lot closer. It was trying to move which is always a promising sign.
Thanks for the tip. Lords know I need the help. Thanks for watching.
rubber bands around the inner tube use the wasted as a liner and lots of soap suds. Knock a diamond loose on that ring and you are so in trouble.
Thanks for watching.
El Cheapo dent removal tool with glue. I have been thinking about practicing to prepare on a good deal on an appliance bargain at a scratch and dent sale. First get good on a washer or dryer, then someday - REFRIDGERATOR!!!
I really like the PDR kit I have. Not expensive and rewarding to do. Even if you don’t get the dent completely out. It’s still better than before. Thanks for watching.
2 mins in am gone tank on concert 😂😂😂
Thanks for watching.
Should heat the dent up with a hair drier or pour boiling water on the dent. You did a good job pulling out the dent looks good
Thanks. It’s not perfect but way better than before. I really enjoy trying to make these old tanks better. Thanks for watching.
Interesting how the inner tube worked, most garages would drilled and pulled the dents out, but fellow Brit suggested water and freezer sounds interesting 🤗 or could a case of 🤬
Need to wait till my wife goes out of town so I can put a tank in the freezer.
Several different ways you can go at it...heres one. Wash it out getting rid of the fumes.... take a propane torch.... induce propane into the tank' then light it with the torch....tap down eyebrows/high spots during the process.
Start out with small amounts of propane increasing and repeating if necessary.
I'm not suggesting you do this but that's how we did it back in the early 70's when I first started doing Auto body and paint.
Back then we used acetylene/tank/torch.
This sounds like something that would involve the fire department.
Years ago I removed all the dents from a freinds dented Honda 4 tank using different levers through the fuel cap hole
I have the levers just not very good at it. Thanks for watching.
It hurts to watch the bottom edge scratched to concrete when wet sanding it.
Good tip. I probably should have put something down to protect it. I need to replace the bottom trim. One side has it and one doesn’t. Thanks for watching!
Was thinking the same thing!
I think a better more controllable method would be to seal the filler,turn the tank upside down,fill with water and pressurise through the fuel tap fitting
That sounds like it could be fun. I wonder how much pressure the filler seal can hold?🤔 May have to find out. 🤣😂🤣
that is the best method to raise a big dent and no danger of exploding anything like there is with compressed air.
Use of an electric pressure washer works the best. No risk of the tank exploding like with air.
I had a buddy just drop an m 80 in a dented tank and bang. Dent gone and increased capacity.
Concrete mold with reinforcement and water pressure. The first two-piece mold and its dent repair. Tank in and high water pressure in.
This sounds fun. Time to make a mold.
I haven't seen this technique used, but I'm thinking that a rubber plumbing test ball could be used. These devices have a Schrader valve and are designed to fill the interior of a drainpipe to force open a blocked sewage system. They are available in most any plumbing supply store, in a variety of diameters from about 1-1/4" to 6". Each is expandable to fit a range of diameters. Fill the tank mostly with water, insert a test ball and inflate with an air compressor. This will seal the ball inside the fill neck and continue to pressurize the interior of the tank, applying equal pressure to all inner surfaces and hopefully pop out the dent.
That’s a great idea. Off to Home Depot I go. Thanks for watching.
I owned a 1980 CB 650 Custom, the same color.
Awesome! It’s a great color. Thanks for watching.
Using a heatgun from a far while doing this I bet would do wonders!
That’s a great idea. The reinforcement behind the badge was the hold up. Would have been easy breezy without it. Thanks for watching. I really appreciate it!
I would try heating the dent area with a hot air gun to relax the metal before trying to pop the dent.
That’s a great idea. Thanks for watching.
Simply brilliant for some tanks, and I found out that apple cider vinegar will eat the rust in any gas tanker anything rusted. Put some fish tank rocks in the air and speed it up.
Aquarium rocks is a good idea. Thanks for sharing.
@motorcyclerewind no it isn't
Lengths of dog chain easier to get out
Attack from the outside use those puller rods that you spot-weld on and then cut and file off..
The last time I tried to stud weld dents ended up having a welder fix all the holes. 🤣😂🤣
You can use the pullers that use hot melt glue to get the dents out.
I did some of that. You can get PDR kits affordably on Amazon. Thanks for watching.
There are kits available that pump water into expansion chambers to force dents out. Both ends of the exhaust have to be plugged. This can also be used on fuel tanks. Water doesn't compress like air, so there won't be an explosive rupture if there's a crack in the tank or a bad weld.
Thanks for the tip. I am gonna see if I can find one. Thanks for watching.
@@motorcyclerewind I wish you luck. I think you'll find more uses for it.
Worked on my MZ50 Simpson back in the day. Id dented the top i just infront of the seat by having someone sitting on it while messing about. Hardest part was squeezing the 110/80/18 innertube in the fill. hole. Getting it out wasnt as bad as you can yank it. Did mine through a spare cap though.
That’s awesome. Thanks for watching.
What is a "MZ50 Simpson "? ^^"
@@fuselpeter5393 80's moped. Google it. Very industrial looking but they tune well.
@@fuselpeter5393A MEGA moped.. 50cc of class! Mz we're a German brand. 😁
@@andrewtodd3242 "A MEGA moped.. 50cc of class! Mz we're a German brand.
"
Well there was never a "MZ50 Simpson" so I was curious what he meant.
MZ and Simson are different Brands and MZ never had a 50cc. Smallest MZs were 125cc.
I’ve watched ALOT of RUclips videos! I would recommend using a deflated football, glue puller, heat and tapping around outside of dent. Thanks 😊.
I to have heard about the football. 🏈 one more thing. Lots of patience. Thanks for watching.
Think heating the area with a heat gun before adding air would of helped. I've done many dent removals in tanks with air, I just seal the gas inlet and add air to the tank with very good results.
Thats a really good tip. Will give it a try on the next one!
👍@@motorcyclerewind
I tried testing a tank for leaks by pressurizing it with air. Didn't take much pressure to bulge the thing.
That’s the big fear.
Dude... scraping that tank in the concrete
Thanks for watching.
I love this color so much, I'm going to add some of it to my sidewalk.
I would probably tie a piece of wire or string around the tube for removal. Also some silicone spray would help.
The wire and silicone spray are great ideas. I really appreciate you watching.
should have let one of those paintless dent guys fix it
That’s a good idea! Thanks for watching.
I had a piece of pvc pipe fall from my garage rafters and dent my triumph bonneville tank. I used a $20.00 hot glue paintless dent puller kit on it. It took several tries and some engineering,(the curve of the tank and thickness of the sheet metal were challenges) but you have to really look for the dent to see where it was now.
Why not tap around the dent while the tank is under pressure?
I am sure that is what someone who knew what they were doing would do. I'm not that guy. LOL!! Next time I will give it a try. Thanks for watching!
Yes 👍
Nice to see Keri out in the shop with you....maybe some time this month we'll see you guys out riding :)
I am thankful Keri is willing to help me anytime. Definitely will be out riding together. I have to replace some leaky floats on her Hondamatic. Video coming soon. lol.
Instead of knocking from the inside you should just apply pressure to the center of the dent whilst slapping the outer edge of the dent with a metal padle from the outside
Thanks for the tip!.
Maybe fill with water and seal cap with sheet of runber gasket material. Apply air pressure through gas shutoff valve. Then use body repair hot glue and maybe tap while pulling. Water is not very compressable. If the tank fails from pressure it will just spray water. If you only use air it could explode.
That sounds like a great idea. I need to do a follow up video using all the suggestions.
water would make it explode too ...if too much p, l thought..but no ...Water doesn't compress like air, so there won't be an explosive rupture if there's a crack in the tank or a bad weld.
Next time, place pressure at midpoint from the inside and then, Ding off the dolly" with a small plastic mallet. That dent would have walked right out. Do a web search for "ding off the dolly".
All the years I thought, “ding off the dolly” meant something else. 🤣😂🤣
how does the inner tube know what part of the tank is dented?
I was using a new SMART tube that uses nano rubber that seeks out dents. 🤣😂🤣 Thanks for watching.
Put your dolly in an old sock to help protect the paint.
That’s a great idea. Thanks for watching.
Soap would help putting the tube in the tank
That’s a great idea.
Why don’t you just take it to a painless dent guy, they’re quite good at this kind of thing.
I could. I just like to try to sort things out on my own. Sometimes it works. 🤣 I felt I could not make the tank any worse than what it was. Thanks for watching.
Another thought about the tube... Put sand in to take up some of the expansion space... Give the tube something to push against
That’s a good idea. Thanks for sharing
As a guy who repairs dents for a living 20-plus years. That ain't how it's done. We use specialized tools and lots of experience.
🤣😂🤣 please know I was not trying to insinuate I knew what I was doing. You guys are artists. I am not!!!
I picked up on that from the title but I couldn't look away.
I guess this guy doesn't like to see his things 'pretty messed up' so he upgrades them to just 'messed up.'
need a camera on a cable so you can see the proper placement with your basher!( bore scope?)
That’s a great idea.
I tried this method once and ruined a CL tank that was pristine inside. The inner tube pushed out the opposite side-wall from the dent side of the tank. The tank deformed and is ruined unfortunatley. Just want to offer my experience if others are thinking of trying this method. Cheers
Thanks for sharing. Not sure I would do it again. Thanks for watching.
LOL, you know I won't!
@@motorcyclerewind
Same mistake he makes here. You forgot to heat up dent.
I have a 1974 Honda ST90 AND LOOKING FOR PARTS.ANY IDEA.CAN YOU HELP.THANKS@@motorcyclerewind
Honestly that's the result I expected to happen...
Pretty cool.. one thing though. Your voice is pretty low and the music is BOOMIN
Apologies. I was so happy I finished editing it and uploaded 18 hours before I missed it. I will try to edit it on RUclips. Thanks.
Fill with water and hook up a pressure washer to the fuel line.
That sounds like fun! Thanks for watching.
I got a nos set of tank Honda badges !
Awesome. Send me an email motorcyclerewind@gmail.com
Next time try heating the area with a heat gun
In your opinion, should I do it before, during or both.
@@motorcyclerewind Both. I've seen it done and it works great on any body metal including motorcycle tanks.
One more point. When I saw it done on a bike tank he put a huge stopper in the fuel fill hole and injected compressed air into the tank rather than using an inner tube like you did
what was the hammering rod tip filled with? I’m thinking of making one of my own. Good video
It was hollow. Filling with sand would have been a good idea thanks for watching.
Soapy water maybe help? . Dry rubber is bad.
I bet it would help. Thanks for watching.
The inner tube may have worked better if you would have heavely lubricated the tube with vaseline (olive oil for you fancier guys) so as to allow the tube to mate with the tank's inner surface ... Well that was my plan anyway. Regards !
Thanks for sharing
Heat up the dent!
That’s a great idea. Thanks for watching.
Rusty tank?
Drain it. Dry it with compressed air. Slosh acetone in it to remove any oil residue dry it again with compressed air OUTSIDE as clouds of rust will be incredible.
Fill tank completely with Evaporust. Let sit for two days.
Drain rinse thouroughly with water immediately dry with compressed air. Tank will be like new inside.
I really like Evaporust. Does such a great job. I use the shop vac to dry tanks. Just let it blow into the tank for 30 minutes or so. Works great hands free.
@@motorcyclerewind
You can also use it to clean/flush rusty cooling systems. You can run it as coolant full strength then rinse /flush with distilled water.
i use cut off bicycle handlebars
That’s a great idea.
@@motorcyclerewind done it for 30 yrs
@@motorcyclerewind done it 30 yrs, there are 100 bends of bars, get into anywhere, just put a cheap grip on and work the dents out
honestly i used to buy dented CB750 original paint tanks, push the dents out, polish or clear them and sell them for obscene money.
Tap down the crown of the dent and the tube should do it easier.
Thanks for the tip. Will definitely use this when I do dent repair again. Thanks for watching.
Glue puller ?
I think using a hot glue puller is the way to go. Use a suitable custom made tool to carefully knock/help from the inside while pulling. There are many videos showing how to remove dents in cars that way.
I like the glue puller I have.
Thanks for watching
Boom!
It was so intense. I thought the tank was gonna explode. 💣
Okay now I guess 12
That’s a good guess. Thanks for watching.
I woulda kept that yube inflated and tapped around the outer high spot of the dent with a rag over the tank and i bet it woulda popped out
Thanks for the tip. I can use all the help I can get.
Maybe put the tire inflator tube on the valve before losing it inside the tank…
That’s a great idea.
Inflate tube, release pressure, let the tube settle just like on a car or bike.
Thanks for the tip. Will definitely do this next time. Thanks for watching.
Could ya loop a piece of rope around the inner tube in order to be able to pull it back out?
That's a great tip for next time. That sounds like you are speaking from experience.Thanks for sharing!
Ya needed some heat
Gonna try adding some heat next time.
Y not pressurize rhe tank without the tube?
Gonna have to try that next time.
Soap up the tube
That’s a great idea. Thanks for watching.
Use a pressure washer...you tube dirt bike exhaust pipes...
Thanks for watching.
"You're going to need a bigger tube..."
😂🤣😂 gonna need more than that.
I’ve used ice to remove a dent in a motorcycle tank.
I’ve heard about that. I’m gonna have to try it. Where’s my 🔨 😂. Thanks for watching.
Yeah but you'd need to very careful not to overfill it or your tank will be transformed into something that looks more like a Soccer ⚽ Ball😉
that's not how you PDR. Proper tools are key.
I agree 100%. Thanks for watching.
A 2 liter pop bottle will hold over 100 psi so I seriously doubt that tank will rupture
I did not know that about pop bottles. Thanks for sharing.
I ripped one apart at about 30 psi. Pretty gnarly explosion. Small weak rust area in a bottom seam that was invisible.
The air compresses like a spring and unloads violently.
Those toilet cleaner and aluminum foil "bombs" in a 2 liter bottle......... I don't know what pressure they go off, but they are loud.
Operative phrase: Paintless Dent Repair
Yes sir. Thanks for watching.
Try heating the dents
That has been the most consist by tip. Need to go dent a tank so I can give it a try. 🤣😂🤣thanks for sharing.
I would not go over 35-40 PSI.
Thanks for watching.
Used do this but my methods are to dangerous to explained
Living dangerously🤣😂🤣
you could put at least 20 pounds and warm the tank. wear ear protection and goggles. no worries.
Definitely some eye and ear protection.
the worst thing that can happen is something bad
🤣😂🤣thanks for watching.
20 secs of actual content stretched over a time wasting 15+min.
Thanks for watching.
Chicken lol crank it up!!
🤣😂🤣
The size tube you need will not fit in the tank.
What size tube do you think would be best?
Just use extreme heat in area
Heat seems like a great idea. Thanks.
@@motorcyclerewind when metal is hot it expands
pdr in conjuction would make short work of it......I think
At least 30psi
Thanks for watching.
freezer
Wife🤣😂🤣
when will it explode .it,s an empty tank ,not c4 . calm your knickers down .
You sound like my wife. 🤣😂🤣She tells me to stop overreacting!!! Thanks for watching.
PDR
Thanks for watching.
I think I would have done a full send with the inner tube -- but that's just me.
Next time I think I’ll do that. Thanks for watching.
Ill bet it explodes at about 35psi!
The tank or the tube?
Your wife is more patient than me. I’m out!
Thanks for watching.
70
I think the tank is a 72 or 73.
heat gun.
I will try that next time. Thanks
Put a heat gun on it
That seems like the bit of advice I could have used while doing it. Will definitely add heat next time. Thanks for watching.
18
Thanks for watching.
Put some bondo on the dents and repaint the tank.
Yes sir. That will get them out. Thanks for watching.