1971 CB750-K1, hard starting, runs poorly, lot's more! ORIGINAL SURVIVOR BIKE! Video 1
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- Опубликовано: 14 окт 2024
- Survivor bike, this 1971 CB750 needs love! Very hard starting, needs carb work, clutch work, bodywork and tank replacement (Motorcycle YAMIA Japan) plus lots more! Join us as we delve into the 18 thousand and change mileage bike in original condition!
Gas tank sealing work outsourced to:
Craig Paints Bikes, Tampa, FL
craigpaintsbik...
I don't know if you realize how much we wait for your videos? Always a treat.
I agree.
Very kind.
The quintessential bike of the 70's. I actually acquired one to restore, finally.
Beautiful clean looking bike glad you were able to get the carbs sorted out, you are the carb whisperer.
Another great video. I raced a K0 in 1971 in production. Old style carbs with 4 individual cables. Nightmare. I switched over to the style carbs you just finished. Great job in the diagnostics and catching a highly unusual issue. Most would not have caught those air screws.
One thing you may want to look at. There are small rubber seals at the top of the carbs where the slide rods pass through. A small shot of silicone lube can help keep them from interfering with the action. It can possibly hold the slide open. I found out the hard way.
Porland International Raceway. Turn 1.....at the end of the long straight. It would not shut off. It took a little while to understand i needed to hit the kill switch.
Quite a moment. APV factor of 10...Anal Pucker Value. Sucked the vinyl right off the seat.
Thanks again for making my day. Be good. Remain safe.
They were so cool! I was jealous, I had a 71 CL350... Oh well.
The air screw differences were subtle but obviously important. Nice catch. We allnlearn today, thank you sir!
There’s more drama in those I’ll talk about in video 2. I found some reference material online, some contradicts the other but according to what I found, there’s a period of time with these carbs during the k1-k2 phases where they used the air screws with the holes and different jetting and some with solid ones. It’s really confusing.
@@MotoRestoFL I'm about to start a 78 KZ1000 resto/restomod. 1075 wiseco kit, balanced welded crank, flat slides for carbs. Not looking for high hp, just smooth and fat on the bottom. I want to use the reproduction 4 into 4 900 pipes, and a metallic brown with 76 900 stripes. Looking for a set of 79 MKII wheels and brakes now. Bike is a barn find, hasn't run in 15-20 years or more. I'm hoping this one is a keeper.
Thanks for the videos! Are you going to Barber this fall? I was thinking of going, tho a long way from Nova Scotia.
Sounds like a neat project. Regarding Barber, no I'm not going this year. I have an out of state trip planned first week of October which ends about the time Barber starts. If I headed from GA to Alabama for that gig, I'd be gone for about 2.5 weeks and the wife would hand me my hat, plus the dog would miss me too much. lol...
Really enjoy your videos, this is another good one.
Very kind.
I had one....had to clean the carbs to get it to run.
It was literally dumped off in my yard. They got away before I could get them to take it back.
Traded it off on about 6 cord of hickory
Well, no one can say that the old Honda didn't give you wood! lol
Moto-Resto doesn't mow his grass, he stands on his front porch and DARES it to grow!
Ha! If you only knew. I’ve been trying to get seeded spots to pop and it’s been a battle. I had a large bare spot where f’king Amazon drivers would drive over turning around even though I’ve got a pull through driveway and with all the rain it’s finally getting mowed.
Nice bike almost NOS condition,I like yours Video they are all in detail😎I just have buy old Kawasaki GPZ900R A2 that need restoration ,Greetings from Croatia!
Wow, Croatia! Awesome. Thanks.
Wow. I went thru a similar issue on a 400 Four I did a few months ago but it was the reverse of what happened to you. The Four into one kit had different jets and screws than what was stock. I was pulling my hair out trying to get it to run right, eventually put the stock parts back in and boom! All was right in the world again. I have sworn off all aftermarket carb kits now and was ordering only OEM stuff from sudco and then they went under Doh!... My next bike that needs stuff like that I'm going to have to figure out where to Source OEM parts from. Past couple of bikes I've just been doing the best I can to rehab the stock stuff using micro bits. Great vid. You and I work on many similar bikes. I've noticed the Magna in the background on a few other vids but never realized what a cool front end it had. Big fan of the V4 anything from Honda and just took in a ST 1100 which is an incredible machine. V65 Sabre or Mag is a bucket list bike for me. Keep up the good fight!
It’s a Magna actually and it’s a custom front end for sidecars only.
Oh and thanks for the info.
We're you gonna do a valve check? Or did you and I missed it? Just asking. Enjoyed the video Tom and RIDE SAFE OUT THERE!
Yes there's some ticking I can hear and they should ideally be checked before a carb sync. I cant hear it on the @54.20 and later start ups though.
Yes, checked twice. The ticking is coming from 1-2 side. Double checked the tightness on the stem nuts also. All the intakes were big and 2 exhaust by only a smidge. I’m gonna check them one final time just to be sure but it may actually be an exhaust leak. The exhausts have some rot on the underside where the drain hole for water is located where the header meets the muffler. It may even be at the header and exhaust port. There’s a quick clip at the end of doing the valve check. It was done before synchronization. Cheers.
@@MotoRestoFLyep your right I missed it. Very nice, look forward to the next installment
I checked it again yesterday morning stone-cold on #1 and #2. Exhausts bang-on. Intakes were big again, but I chalk that up to operator error. I don't have a .002 thou feeler (well, I sorta do, but it's difficult to use) and I was trying my .0025 feeler and going snug. I reluctantly used the .002 feeler which is a pain to use (it's really small) and triple checked the intakes and tightened the stem nuts, so we'll see. If it still makes noise, it's an exhaust leak, but I couldn't find any of those either.
On the air screw, did you end up using the K1- -014 or the K2- -024? I'm just guessing, but since nothing else about the carburetor appeared to be different, K1 to K2, maybe this was an upgrade to fix a problem that rarely happened in normal use, but happened under unusual conditions.
I'm not sure, but from what I can glean from a few guys who publish carb charts for the CB750 and have some additional narratives written, The K2 is the one that had the hole in the air screw, then it didn't, or then it did, it's very confusing, sounds like Honda went back and forth on it for at least that model year. I believe the one I put in, the sold one without holes, is typically what is found in the K1 and likely the K0 as well. I would like a chance to go through Mark Paris's CB750 book, where he supposedly goes through the tech and model variations, but it's $90 bucks and up for a copy, I have to watch my pennies so, that's a Negative Ghost Rider on that one. Cheers.
Interesting, I don't think the early Honda CBFours had cylinder fin rubber dampers.
Me neither. First thing I mentioned to the owner when I saw it.
I was told that the final 3 digits are revisions of the same part. 24 revisions are a lot!!
I'm not sure on this one. As opposed to the old Kawasaki's, I am finding these early Honda's seeming had a lot of changes during model years regarding jetting, air screws, etc. Mark Paris's book on CB750's would probably be the best central resource for information, however, it's $90 bucks plus shipping and frankly, not to offend anyone, but this 750 doesn't float my boat like the old KZ's or a Honda V4 does.
What brand of e-ignition is installed?
Charlie’s Place. But with Dyna coils.
👍👍👍👍👍
Great bike. Looks like he replaced the coils with some Dyna coils... so it's probably got an electronic ignition. I think it should have 40 pilot jets.
I'm not sure I understand why he's buying all these new parts when the stuff on the bike looks great, including the paint. If the decal is coming up on the tank, can't he just sand down some clear coat then get a new decal...or repaint the current tank and put new decals on it....rather than buying a new one?
You’d have to ask him that. The inside of the tank is likely the reason. He wanted a fresh tank I guess.
Yea it has a Charlie’s Place ignition with dyna coils. I cannot explain the jet deal. If I’m missing something I have zero clue what it may be.
😎
Ha keyboard warriors know everything lol,,,Keep up the great work that you do,,,for fun
True but some do. The seat is NOT original. Purists know this.
When he says 'slow' jets he means pilot jets. Annoying about those Part No. inaccuracies.
Typical restoration............lotta polish.......not much wrench knowledge.............
My part isn’t restoring, just repairing. If this was a bolt by bolt resto I’d have sent the OG stuff out for paint and probably purchased Mark Paris’s CB750 book and followed it to the letter. Remember, I can only do what the owner instructs me to do.
True, you are just going by what you were told. But....the seat is not original. Not telling you, just others who are interested in acquiring vintage Hondas.