What is wrong with YZ250 engine?? - YZ250 build
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- Опубликовано: 7 фев 2020
- Hey guys today we are going to work on our YZ250 build, we will take apart the engine and see all the damage. At this point I only know about the crank, check out the video and let me know your feedback. We are working with Brad from Parapros garage, you can find him at instagram @parapros
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yamaha yz250 2 stroke dirt bike build - engine 
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It's quite apparent that this isn't his first time! Great vid
thanks Vince, appreciate it!
He was so aggressive tearing that poor engine down😂😂😭
Ikr i was thinking the same thing
not really, its made in metals, not from ceramics/porcelains.
I think he was doing just fine .. prlly torn down hundreds of motors
nothing to worry about
Can you not find anyone more heavy handed to strip the motor? LOL.
Lmao
Brad at Parapro's Racing is the best mechanic. If you want it done right. Take it to The Parapro's Team. 👍👍👍
What, like you LMFAO
@@scoobgirl yes like me, a mechanical engineer by trade.
Nice work Brad!
Great video enjoyed watching the strip down. Brad knows his stuff. Loads of information. looking for to next video. keep up the good work.
thanks, will do my best!
You are so lucky Rado. That mechanic is a professor.
Congratulations for his baggage of knowledge.
Yes, thank you! I really like working with Brad!
Brad is good but not great. Anyone can work on a dirt bike motor it's not hard. I would never have him do work on my engines to heavy handed foes not take his time.
Love your work mate keep up the top job can’t wait till this engine is fully rebuilt and back together god bless
thanks bro, appreciate it! will do my best ;)
All the bad will be forgotten when ya rip down the trail the first time on the bike😉 nice vid Rado👍
thanks Barry, I think so too ;)
Look forward to seeing this beauty
By the looks of that piston, that mills got a shit ton of hard hours. The beauty of 2 smokers is the cheap rebuilds.
yea, she had some time on.. thats for sure
As for cheap rebuilds, this wasn't one of them.
Enjoyed the video. Loved the intro. Awesome. Good luck brother!
Glad you enjoyed it! thanks brother!
I was worried about the haircracks on my cases as well... Glad to hear they are fine.
Yea.. they look scary for sure
Can,t wait to hear this Tom Morgan ripper fire up. Millenium didn,t leave quite enough clearance one time on a 06 rm250 of mine. Give it a check to be safe. good luck on the project fellas
thanks for sharing, I will check it, but I am sure Tom did great job
That guy is professional he did a great job tearing down that motor
yes he is really good!
Good work guys
thanks bro!
He's so confident when splitting the cases he does it with an impact gun!! Meanwhile I'm over here taking 1/8 turns with my wrench then checking everything softly with a rubber mallet.....
another good job Rado ....
thanks Brad!
Really nice video! lot's of your you got with this build haha :)
thanks Nir! long time no see ;)
@@dirtniron haha...indeed my friend! :)
I'm back now for this YZ project
Good to see you working with a 2-stroke! Don't know how many of these I've done.....looks like whoever had it got the last mile out of it....LOL! This should be interesting after you stuff a bunch of dollar bills into it! Rado, we must be related as you sound like all my cousins with the accent! Good luck in all you do! Tom
I have no idea what accent are you talking about. 😂😂
yea, the bike was ridden hard and till the end.. should be sweet package once we are done!
It’s like Christmas. Open it up and see what you got 😂
hahaha, exactly! what a gift it is ;)
I'd guess the broken power valve actuator arm, saved the powervalve componants from wearing out - perhaps from some earlier attempt to retime/adjust the valve via some ilconceived previous owners different ECU/Ignition failed 'home-tuning' (or very unknowledgable garage/shop) mod ?
..or something, that caused the valve to hit the port bridge/stop at the wrong exhaust flow time and cause the arm to fail ?
Don't forget to measure and correct the compression squish height, a known issue with these YZ250 engines.
yes, sent it to Tom Morgan - one of the best 2 stroke tuners in US
Hey - can you do kid junior el. bike video , tips - thinking of getting 1 or 2 til sommer - was thinking 1 trail bike for a 12 y.o and/or 1 cross/dirtbike for a 9 y.o
That face on the thumbnail. I know that very good
hahaha
Wrench rabbit kit in that engine. no wonder. Hotrods Chinese crank and bearings 🔧🔧 hopefully you put better parts back in it
yz250 pressure plate , pressue springs, ? new bike looks diff......... what is old bike function
I'm interested to know how the wide raito compares to the ktm xcw trans.
1st and 2nd are same as MX bike YZ250, 3rd is shorter and 4th and 5th are longer.. lets see how it feels on the trails
Qué año es la moto yo tengo una del año 1986 es el mismo motor
If you are going to do an entire top and bottom why wouldn't you replace the PV springs since they are probe to break?
Do a esr 325 big bore kit
I want to keep this one stock 250 and do some porting work..
I put brandnew vforce reeds in my 2018 yz250, I ride mostly hard enduro, after 1 ride, I took the vforce reeds out and they been on the shelf since. I lost alot of slow end lugability. Up top n mid range they were a improvement over stock reeds but most of my riding is lugging around.
thanks for sharing Ernie, I will run vforce too, lets see how it feels
Do you want them? I can send you them in trade for a XL T shirt 🍻
@@dirtniron something I did on my yz250 that is the best mod I did,,, motion pro coolant recovery system tank, I do alot of really slow speed hard enduro riding. I've never once had my bike steam up or foul a spark plug. Best 27 dollars I've ever spent
@@dirtniron I posted a video of me climbing a mountain in the snow on my yz250, check it out.
I feelt the same, the nice smooth power in bottom dissapered with Vforce.
looks like the thingymajig has been rubbing on the whatchamacallit.
😂😂😂 that sounds about right
Looks like the "armchair master engineers" came out in force for this video.
:)
I agree it’s crazy ... I send my motors out with pride and they win ! My motors have one multiple championships .. it’s crazy what these guys say .
clutch taking out a bigend - what planet. Just put a clutch basket it in so it disengages easily. The trans will be fine, maybe 2nd gear and measure the shift fork finger thickness, they get false neutrals
Are you using the yz250x transmission in this build ?
Just curious as you say you have a wide ratio gear box and wondered if it’s a straight swap
Thanks
yes, it is a 250x transmission, just as Kris said, 3rd, 4th and 5th are different. It is straight swap
Yes all correct
Ah. So how bad is it if there are scratch marks on the inside of the crankcase from a bearing going out? No cracks all the way through, but I'm looking at a decent wear mark almost all the way round. Thought i'd sandpaper/scotchbrite it out?
I'd touch it up very lightly just to get any flakes off that might break off.
that was just a tear down ... wait to you see the assembly ...
Will do! Then I might finally get this motor rebuild ...started. :)
Sneeuw send me a pic of it on IG and I’ll look at for you ..@parapros ..
@@brad5664 Hey Brad, I don't have IG or FB but I've made a clip of it: ruclips.net/video/YiJOY598nK4/видео.html
Doesn't look too bad, I think?
One bag with all the parts mixed lol
thats bc he knows exactly where everything goes! and it wasnt just one bag ;)
not one bag but i know where every bolt goes and washer and nut ...
Imagine thinking he doesn't know what he's doing. Dude is a pro at building engines.
So funny, I felt panic when he started tossing it all in that bag. Would be so satisfying to have it all down to memory like that. It’s like watching kids clearing the triple at the mx track. Envy.
I wonder if it would be cheaper to replace the whole engine than pay someone to replace everything except the casing.
I was scared, reminds me of chef from the Muppets, wot teardown
Have Tom Morgan port the cylinder.
64maxpower yes we sent to Tom Morgan for the re plating And have a little bit of work done it will be really nice motor when all said and done
@@brad5664 have you considered a Stic for the carburator? I ve heard only good things about it
we are going to use SmartCarb for this engine
Hello im a mechanic in dirtbikes for extra money where do u get tjose tools to push the crankshaft out
motion pro case spliter
rocky mountain sell them , tusk brand is cheaper works just as good
If the clutch overheated how will that make the rod fail??
Ryan Muller when the clutch goes out like that the motor RPM will be really high and bike going nowhere witch in turn would cause heat to build in rod bearing
Because motor if flying and going nowhere
@@brad5664 bearings need a bit of a load or it just kinda revolves around and is able to slightly float in a way. For lack of a better term. That's how I see it. Be nice internet I'm not an engineer 😆
@@robbed_of_sanity when a clutch goes out tho and you are pinned because your think your going slow so you just keep it pinned your motor will over heat and lean out there for on a rod bearing that is already worn out it would just burn up the bearing ,,
And I probably should have said that could be 1 of the reasons why the rod failed . It’s just some people think they can just keep it pinned when there clutch is slipping that bad ... I had where you could put in gear let out clutch and gas it and go nowhere!
That’s bad o the hole motor
Hmm, I may jump in here. I'm not a mechanic, but I am clued up on motors.
Unless the design changed over the years. 2t rods have a roller bearing both top and bottom. They do wear out. But the crank pin big end likely would come up to spec if mic'd. And those crank wheels too would have been fine. The shafts don't spin in the bearings.. So this uneven wear about the clutch going bad causing excessive wear on the crank/ big end, seems like some theory some one has come up with.
Now if we where talking harmonics. Or excessive rpm throwing the big end into excessive load from inertia, that too would be a feasible approach. But I'm not buying the heat generated. More parts would fail before the big end would be effected by such heat to cause failed. IMHO.
Gk jual blok yz250
I need a “stay #Moto vated” sticker 👌🙌
I should get some..
Says make sure you get all washers. Then proceeds to throw everything in the same ziplock baggie real professional 😂😂😂😂
thats because i know where every ones goes ....
Why would you put it to separate bags, and how many bags? The main reason is to know how to put it back together and dont loose any small parts, right? So imagine that you know exactly where every small washer and spring goes, because you build like 6-8 engines weekly, would you still bag it all separately?
At 8:24 it looks like there's a crack in the case going down from the main bearing, through to the exterior of the engine about 1" long. Doesn't look like a manufacturing mark, that one. It veers off around the bolt hole.
hello.... they are just case marks all the yz250 have them they do look scary but its cast making i can clean them up and you would not see them
when we do the motor in the next i will show more on what they are
do you have your old transmission still for sale haha
i do, but I want to keep it
Barsel me that engine I need it plz 😌
:)
this is how to god tear down poor engine :D
cool
all mention of pressure plate is clutch not engine
well technically the pate is called a holder but it uses pressure to keep the valve so it doesn't move around so we just call it pressure plate the springs are called compression springs but again it uses pressure ...thats why we just call them pressure
@@brad5664 thank you, i am accustomed to old simple ones. ha ha
Is dude in a wheelchair?
I thought side to side movement was okay.
yea, Brad was in a freaky dirt bike accident long time ago, thank God he made it!
Casting flaws.
yes..
Put a 300 kit in it... or bigger
i want to keep this one 250, previous 2 stroke build was 300 big bore ktm..
All those precision ground washers bashing around in the bag against the gears, nice......
Port before plating
it will be done at the same place.. I realized after the video
Hate watching guys slapping the rod around and taking it apart with piston still on the rod take a rag or something and at least stuff it in there kind of a hack
Why not buy new engine for back up incase have same trouble happening again and build old engine used now! Mostly I be doing same thing because my engine on my scooter is Quasar engine hard to find parts for it!
no need for that around here.. yz250 has all the parts available .. its very popular engine
@@dirtniron Ok thanks engine on my bike stops making 2010 parts for it over sea but one place find parts Calif.
First
Why are you so rough with the engine if you did that to mine and I was around it wouldn't end well. I don't care if it needs a whole engine rebuild. That's my baby 😕
emmanuel Bent
Like what was so rough?
Please tell us ...
Yes, i am interested too. What is so rough?
@@brad5664 I bet that guy sends his bike to the shop to get the oil changed. Some people have no idea what sort of force is required to dismantle an engine.
Xterrential yes very true .. thx man
Lol I have an opinion, I've said it, I do all my work myself 4 strokes and 2. I save my bikes from work shop warriors, like that guy in the video roughing up that engine 😂lol I'm not going to get into a RUclips keyboard war. I like dirt n iron. So go war with another comment. Keep up the videos 😀