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Bike will push start but won't kick start?

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Hey guys, my 04 rm125, all stock except pipe, doesn't kick start. I've fully rebuilt the carb, cleaned the air filter, n put in a brand new plug and it still won't kick over. If I push start it, it runs like a dream but when I stop, it won't kick over again. I've been told it could need a new top end (there's some oil around my spark plug and a lot out of my brand new pipe) or the magneto. Anyone have any guesses? Thanks.

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Does the kick starter feel like it is functioning properly? (ie. compression, full range of motion, etc.)

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Ya the kick starter feels normal and the bike sounds like it wants to start but never does. I thought that after warming it up and riding it that it would start right back up but it doesn't unless I push start it again.

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You could check the reeds first, but may need new rings at least. My brother had a YZ 80 and dirt got sucked into the cylinder and lowered compression. We could kick all day and it wouldn't start, but push it to start it and it ran like crazy.

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I'm betting that it's low compression ~ and that it's time for a new top end.

The normal tell tale sign of a two stroke top end that's been pushed too long is hard starting.

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weisco, pro x, or even oem. i prefer weisco just because thats what ive used in my bikes and they work great but ive put in pro x pistons in buddies bikes and they work just fine too. just remember to inspect your cyl walls while the jug is off

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could be your jetting

my 250 was jetted way too rich

one kick with a little throttle was enough to flood it, you really coudnt get it going then by kickstarting

but push start worked

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