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I got a 98 yz125 and just replaced the top end on it. I took it up to the mountains to do some trail riding and I rode for about an hour and a half or maybe 2 hours and it will not start when i try to kick it now. It will bump start but that is it. There was no coolant in it after I was done riding and the radiator was not even hot any suggestions on what this could be?

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are the mountains cold? One time my bike leaked out all of its coolant (forgot to put in the drain screw back in). Then i refilled it but it had blown a head gasket so then coolant was leaking in. I noticed something was wrong so i shut the bike off. THen it would NOT kickstart, it bump started tho. I ripped off the jug and it was just filled with green goo. Unlikely that its your problem as well, but just a thought.

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that or a head gasket!

Yeah only run start sounds like no compression so pull the head off for a start

Unlikely that its your problem as well, but just a thought.

Or likely..

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if there is coolant in the head, your spark plug should be wet or covered in green goo like mine. Either way, i agree with everyone that said rip off the jug.

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