Question about 2005 Factory bike Chrono SM 250

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Hi ive got a 125 ghost bike it recently threw the chain off and broke the magnito fixed that now the back wheel has started to lock up every now and then sometimes when pushing it a few mtrs or when riding cheers ROB..

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  • robwilson301 Jun 19, 2009

    the chains straight sprockets fine ive been told a bit of metal could of been lodged between the fly wheel when the magnito broke but ive checked its all clear ,the engine runs fine you can ride about 5 mtrs then locks up same when you push it in neutral

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  • 125 Answers

Generally when the chain comes off it is because it is too loose or has gotten something in it.
There may be something lodged by the front or rear sprocket.
Did you check the teeth on both sprockets after reinstalling the chain?
Is the chain bent sideways? (not likely but possible)
Has the chain been properly adjusted since it came off?
Is the rear wheel straight in the frame?

Posted on Jun 16, 2009

  • jim horton Jun 19, 2009

    Try removing the chain, start the bike, and, with the engine idling, pull in the clutch and put the bike in gear. Release the clutch and see if the bike will continue to run (like it was going forward). If it stops suddenly, you have internal engine or transmission problems. If it seems to operate properly, you have eliminated internal problems.



    If your test shows internal problems retrace the steps you took to repair the magneto. Look for a bent shaft or any pieces of metal. When an engine is stopped or overreved suddenly bad things sometime happen. Remove the spark plug and turn the engine by hand. Is it rough or irregular? Does it make strange sounds?

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My rm 80 1stand 2nd gear locks wheels


If your rear wheel is locked up in first and second gear with the engine running, this is not a good sign. Have you ever ran the bike without oil in the transmission? Every time I've seen this, the chain was thrown off the bike and it busted the cases. The oil leaked out of the cases and the transmission locks up. Generally, it locks in fifth gear but it could lock up in any or no gear.

Your problem sounds like something is wrong with the low gear-second gear "clutch gear". The clutch gear is gear that slides sideways on one of the transmission shafts to engage the proper gears. If the bike will roll when in neutral, these may be the only gears affected. If the bike will not roll when in neutral, your problem may be in countershaft. Either way, the transmission could be damaged.

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