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  #1  
Old 01-21-2013, 06:30 PM
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Default Engine problem

     

On my 1986 cr125 I was riding and then the back tire grabbed
And let go so I kept riding well 10 minutes later the bike shut off and I can't push the kick down or put it in gear and the back tire does not spin any help please?
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Old 01-21-2013, 06:47 PM
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Most likely cause-you have fried your piston. Take exhaust off and look at the piston through the ports, if it's scored real bad then it's probably seized.
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Old 01-21-2013, 07:17 PM
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Thanx for the info I also forgot to mention that the clutch has no play to it I just don't get it cuz the bike ran fine all day but I will check that piston though
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Old 01-21-2013, 07:26 PM
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A seized piston won't show signs of breaking down til it goes.
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Old 01-21-2013, 08:12 PM
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What would explain the clutch though? It has no pressure what so ever
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Old 01-21-2013, 08:31 PM
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The clutch pulls like it isn't there?? Is that what u r saying or it just isn't dissengaging after this lock up?

Regardless If it locked up it needs to be pulled apart...start by pulling your exhaust like stated to c the top if it doesn't look cooked then pull clutch cover to c if anything is wrong there if not tear it down u will find it eventually
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Old 01-21-2013, 09:00 PM
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No the clutch pulls like it isn't there that's correct. Thanx for the info bro imma tear it down tommorow and see what happens may just go with a big bore kit if I can find one for that bike
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Old 01-21-2013, 09:24 PM
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Possible broken main shaft. bike wont roll in neutral?
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Old 01-21-2013, 09:41 PM
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Na the bike won't even let me shift it into any gear it's like it's stuck and the clutch lever doesn't have tension, the kick won't go down and the rear tire doesn't roll at all 0.o
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Old 01-21-2013, 09:45 PM
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its transmission related it sounds like. the clutch is mounted on the mainshaft. no telling how much needs replacement without a teardown. you need a flywheel puller and a manual.
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Old 01-21-2013, 09:54 PM
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Agreed ^ sounds more transmission related for sure
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Old 01-22-2013, 06:22 AM
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maybe heat seized. my mates husky wr125 locked up one time he left over night and funnily enough it kicked over the next morning. you gotta expect these things damn 2strokes.
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Old 01-22-2013, 10:51 AM
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Dave, It's not the 2 strokes fault it heat siezed! If your friend doesn't let his bike warm up before he beats the piss out of it than he's retarded!

As for the engine problem I agree it's the transmission, If you have a manual with pictures I'd take the whole trans apart clean and inspect, and check all the bearings.
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Old 01-22-2013, 11:10 AM
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Any idea where I can get the flywheel puller?
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Old 01-22-2013, 03:54 PM
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Just about any auto parts store will have one.
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Old 01-22-2013, 05:08 PM
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Well I turned the flywheel with a ratchet and I hear grinding in the bottom case and at one point the shifter went down into gear then wouldn't move but now I'm having a problem getting the swing arm bolt out to remove the engine, I've tried tapping it with a hammer. Is ther another trick to it?
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Old 01-22-2013, 05:17 PM
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When I find a swinger bolt I can't get out I try to tap the end for 3/8 all thread and use it like a slide hammer
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Old 01-22-2013, 07:22 PM
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i just use an 3/8 extension and a 2lb hammer to get those hard stuck in place SOB's. probably time to redo the swing arm bearings huh?
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Old 01-23-2013, 03:26 AM
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Quote:
Originally Posted by two smokes View Post
Dave, It's not the 2 strokes fault it heat siezed! If your friend doesn't let his bike warm up before he beats the piss out of it than he's retarded!

As for the engine problem I agree it's the transmission, If you have a manual with pictures I'd take the whole trans apart clean and inspect, and check all the bearings.
lmao. 2 strokes are prone for trouble. it wasnt down to him not warming his bike the shop who was suppose to be professional in rebuilds manage to fit the oil ring wrong. we found this fault ourselfs.
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Old 01-23-2013, 07:57 AM
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Sorry about that, I missunderstood, hope nothing was damaged.

I'd try putting penatrating lube anywhere it would go in on that swing arm, let it soak an hour or two and then put the beat down on it.
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