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  #1  
Old 12-29-2009, 07:57 PM
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Join Date: Dec 2009
Last Online: 12-30-2009 04:55 PM
Location: ga
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Default bottom end

i thought the top end was the issue on my 01 cr 250 but when i tore it apart the top end is perfect condition


i just dont know a whole lot about the mechanics of the bottom end on a two stroke but i could get it to kick over for a few turns then it would just lock down when it got to a certain point does that sound like there is a chipped tooth on a gear somewhere or something with the crankshaft or what do yall think i am probably gonna be pulling the motor tomorrow or the nect day but dont want to go into it with out some sort of clue of what to look for so any ideas or whatever yall have just let me know
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Old 12-30-2009, 09:20 AM
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If it's locking up it could be a lot of things. You could have a ring hanging on a port or you could have trash flaoting around in your transmission that's getting lodged in the primary drive gears or it could be a trashed crankshaft bearing - hard to say.

A complete tear down will find the problem - it will probably be obvious.

Scott
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Old 12-30-2009, 04:55 PM
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yea i know its not anything in the top end but didn't know if there was something simple i could try before i tear the whole thing down but looks like its pretty much gotta happen either way
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Old 01-03-2010, 06:27 AM
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hey mate, what part of the top end have u pulled apart? have you just removed the head or have you pulled the barrel off too and inspected the piston and or sleeve/ports/powervavle ec ec?

1. Try removing the stator cover to inspect that area, something might have blown/jammed in there (only 4 bolts, nice and easy)

2. If you have pulled the barrel off, inspect the crank/flywheel for any metal shards or peices. (my bike (01 cr250) recently blow a piston apart which for obvious reasons caused it to jam after a few revolutions, reason for this was confirmed by find/seeing metal chunks wedged around the big end bearing.)

3. Check for metal deposits or peices in the trans oil.

Does it jam when turning the engine over in gear or nuetral also?

Be very careful and gentle when diagnosing this problem, dont try and force a turn or anything like that, could cause more damage.

good luck!!!
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Old 01-07-2010, 12:23 AM
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first off. tell us what the bike was doing that made you want to take it apart and lets start from there...
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