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Brandon Trumbla

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About Brandon Trumbla

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  1. Brandon Trumbla

    1998 YZ250 Hard to Kick, Wont Start

    Piston is in right. Arrow towards exhaust. And ok ill have to crack it open and do a rebuild. Was hoping to get away with not doing all that haha
  2. Brandon Trumbla

    1998 YZ250 Hard to Kick, Wont Start

    Hey guys, I bought a 1998 yz250 that needed a top end rebuild. When checking the bike out the top end was already off, piston still on the rod. It turns over freely. I pressed the kick lever down and the piston obviously goes up and down. Basically the bike was a $700 buy that needed a top end. no big deal. new excel rims and dunlop tires, had everything to rebuild the top end already, new renthal bars, grips, etc. plastics worn out but no big deal. well worth the $700 in my book. So here's where my problem lies, after putting the top end back together, i'm finding it super difficult to kick. before i put the head cap on, the piston moved up and down smoothly in the cylinder as i pushed down on the kick lever. as soon as i put the cap on and the spark plug in, it became almost impossible to kick. I stand on my dirt bike stand to give me leverage on the kick lever and put all 200lbs of myself on to the kicker and i've gotta give it a little bounce to get it to kick. When it does drop all i hear is the piston stop at the top of the cylinder like its got all the air compressed. I'll reset the kicker and drop down on it and it'll kinda drop or get hung up like the piston doesn't want to suck back down and when the piston finally gets low enough in the cylinder i can hear a thump of air out the carb. I tried kicking this thing for a half hour with the piston getting hung up because of the compression not wanting to let it go. At least thats what i think is going on. and when i get the piston to clear the intake, it finally releases the trapped air. As far as spark goes, i've got a ngk 8es or something like that. not sure off hand. I do know its not the R plug. spark was there, wasn't the strongest spark but not the weakest either. Any idea on what could be going on? I think my next step is to take the plug out and see how easy it'll kick with out the plug in it. Any ideas would be appreciated, thanks.
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