palehorse
Scoot Member
Off grid in Idaho
Posts: 22
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Post by palehorse on Jun 13, 2024 15:45:42 GMT -5
OK so it runs. But when it starts the starter drags and doesnt retract when it fires up. Problem 2 is it seems to have a variator fan wobble like it a record pressed off center. Is the variator fan supposed to have splines? The splines on mine are gone and its smooth but tight. Also does the head use studs for the muffler or are they bolts? I am missing those for some reason. The way the variator is moving around it almost looks like the end of the crank is bent or  Watch the video and see if you see it. Strange! |
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Post by aeroxbud on Jun 13, 2024 17:27:02 GMT -5
On dear it looks like the crank is bent to me.
Take the variator off. Then using a piece of thick wire or old coat hanger. Wrap a few turns round a couple of the case bolts loosely inserted, with a tail ending by the crank. This should hold the wire steady in a fixed place. Then by turning the crank by the fan you should be able to determine any wobble.
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Post by Psychedelicode on Jun 13, 2024 20:22:40 GMT -5
I agree with aeroxbud.
That drive face is not centered (possibly because it has no splines).
Or, the crank is bent.
I have a variator face that came in that does not have spline but works great.
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palehorse
Scoot Member
Off grid in Idaho
Posts: 22
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Post by palehorse on Jun 13, 2024 21:42:58 GMT -5
On dear it looks like the crank is bent to me. Take the variator off. Then using a piece of thick wire or old coat hanger. Wrap a few turns round a couple of the case bolts loosely inserted, with a tail ending by the crank. This should hold the wire steady in a fixed place. Then by turning the crank by the fan you should be able to determine any wobble. How would the crank get bent? Could it be a bad bearing on that side? Or a bad variator in total? I will take it off tomorrow and start it and see it the crank wobbles. |
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palehorse
Scoot Member
Off grid in Idaho
Posts: 22
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Post by palehorse on Jun 13, 2024 22:15:48 GMT -5
Well.........It's bent. Can I run it like that? How the heck could it get bent? FUDGE! All this work and $$$ on gaskets rollers, clutches, springs, reeds, batteries etc down the drain. CRAP! If I had time and money I would just tear it down and make it fast but for the same money I can buy a running bike. Double crap!
Can I bend it back? Maybe give it a wack with a rubber mallet? Or am I going to F the bearing?
Its off by maybe a 32nd of an inch.
Could this have happened when the last owner stuck the piston for lack of injector oil?
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Post by Psychedelicode on Jun 14, 2024 2:53:12 GMT -5
Well.........It's bent. Can I run it like that? How the heck could it get bent? FUDGE! All this work and $$$ on gaskets rollers, clutches, springs, reeds, batteries etc down the drain. CRAP! If I had time and money I would just tear it down and make it fast but for the same money I can buy a running bike. Double crap! Can I bend it back? Maybe give it a wack with a rubber mallet? Or am I going to F the bearing? Its off by maybe a 32nd of an inch. Could this have happened when the last owner stuck the piston for lack of injector oil? I can only assume that someone tried to pry the C.V.T. belt on to the variator. Straightening a crankshaft can be done. It's too advanced for me. (I've never needed it) |
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Post by Psychedelicode on Jun 14, 2024 3:13:37 GMT -5
Don't be discouraged. A bit of frustration is par for the course in any mechanical endeavor.
It looks like you have a solid platform and have a mechanical mind.
Search on the forum here. I'm fairly confident 90GTVert did a write-up on crank straightening.
There may be a video too.
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Post by aeroxbud on Jun 14, 2024 4:30:45 GMT -5
The chances of getting it straight without first removing it is very slim I would think. Cranks are fairly cheap if you go for a standard one.
Would be better off just replacing it. It's not a great deal of money. But time consuming.
You would need new seals, crank and bearings. A gasket set and some RTV. A torque wrench would be a good idea too.
Probably looking around about $80 for a crank. Seals and bearings, about $50.
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palehorse
Scoot Member
Off grid in Idaho
Posts: 22
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Post by palehorse on Jun 14, 2024 7:36:54 GMT -5
The chances of getting it straight without first removing it is very slim I would think. Cranks are fairly cheap if you go for a standard one. Would be better off just replacing it. It's not a great deal of money. But time consuming. You would need new seals, crank and bearings. A gasket set and some RTV. A torque wrench would be a good idea too. Probably looking around about $80 for a crank. Seals and bearings, about $50. Can you post a link to an 80 dollar crank? All I see is 200 plus tax plus shipping so 250. Im guessing I cannot drive it like this, correct? If I have nothing to lose (crank + bearings) I might as well give it a wack with a mallet and see what happens unless it will damage case??? |
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Post by aeroxbud on Jun 14, 2024 9:57:37 GMT -5
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palehorse
Scoot Member
Off grid in Idaho
Posts: 22
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Post by palehorse on Jun 14, 2024 12:08:33 GMT -5
Not sure if you're is a 10, or 12mm crank without an engine code. www.partsforscooters.com/161-194-Crankshaft-50cc or www.scootertuning.ca/en/crankshafts-replacement/25013-crankshaft-teknix-standard-12mm-16mm-cpi-vento-keeway-1000000002306.html just to give you an idea Its a 10mm, are those cranks any good? Can I run a big bore with them? So I need everything in the pic, the c-clip, the bearings, the oil seals, head, cylinder gasket, honda bond, a new variator (mine is old), what else? Does anyone sell the crank puller tools cheap? Am I missing anything? Thanks for your help by the way. I just sent you an E-Ribeye and brewski.  |
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Post by aeroxbud on Jun 14, 2024 12:48:52 GMT -5
Parts for scooters isn't the cheapest. But they stand by what they sell. So it should be at least the equivalent to a stock one. Probably better.
I've never really looked for a crank puller so I'm not sure the best place.
The circlips that hold the oil pump drive on are reusable. But the clips that hold the small end in are not.
Just by a complete gasket set. I wouldn't re-use them.
These engines are not so complicated to rebuild. Lots of information on here, and people to help if you get stuck.
The crank puller does make it easier.
You would also need a heat gun, or torch to beat the cases.
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palehorse
Scoot Member
Off grid in Idaho
Posts: 22
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Post by palehorse on Jun 14, 2024 12:58:00 GMT -5
Parts for scooters isn't the cheapest. But they stand by what they sell. So it should be at least the equivalent to a stock one. Probably better. I've never really looked for a crank puller so I'm not sure the best place. The circlips that hold the oil pump drive on are reusable. But the clips that hold the small end in are not. Should I use their crank and oem yamaha bearings or.... Standing by a crank that fails makes me cringe. Its not like an oil filter you can spin off and say "here" give me a new one. The oem lasted 20 years and 27k miles and xx years of that was with a BB kit so oem is tough. Maybe I will make this next winters project. What type of bearing is on the bottom of the rod? This is the one I want but no cash for that. www.youtube.com/watch?v=H2JIqOJne10Check this deal out. seattle.craigslist.org/est/mcy/d/bellevue-vespa-gtv/7755207935.html I have a 6.5Kw solar system to install before it starts snowing again. |
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Post by aeroxbud on Jun 14, 2024 14:36:47 GMT -5
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Post by aeroxbud on Jun 14, 2024 14:39:08 GMT -5
I had an 02 BWS, which is the same as your Zuma. They are a great bike with strong engines. And a lot of fun to ride.
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Watch the video and see if you see it. Strange!
