Bike is a 2007 yz 250 with a new crank new cylinder, new piston and rings , new center cases w/ all new bearings and seals . bike was running great and the next day won't rev up all the way have checked everything . don't know were to go from here
SOURCE: yz 250 2008 possible 5th gear stripped?
I doubt that any gears are stripped. Believe me you would have known it when it happened at 40mph which is where you would have to be in 5th gear. This is a bent shift fork. The actual gear is fine. The slider gear is not moving far enough to engage with 5th gear. The YZ does tend to have this problem in 5th and 1st. "Dirt rider Magazine " did a story on it. Best to let the shop do the repair as the entire motor gets torn down into about 100 parts.
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SOURCE: bike runs well then dies
i would try cleaning the carb out & flush the tank,then try new gas.that should work.ive never heard of it being eletrical.
SOURCE: how much is my yz 125 worth?
the retail value in good condition is approx $1,500. meaning it looks good, runs good, good tires, breaks,chain and sprokets. but with the extras you have and the after market up grades, i would start with a little higher price.
SOURCE: bike has no power up to 7000 rpm
your fuel to rich or to pore. carbon bild up in exhaust tail pipe. measur the compresion of the two cilinders. look for gas leaks valve carberatuur gasket cilinders. greeds j kerkhof
SOURCE: 1992 yz 250 won't start
A couple of things.1.Check the fuel oil mixture is correct.It seems rich.2.Check that the carby is not running to rich.With new reed valves etc.it may need to be set back to the original manu. specs.With older parts it may have been retuned to make it run with the old parts.(carby jetting etc.)3 make sure the fuel oil mix is using a good quality oil.It does make a world of difference.I hope this is a start to get you going.
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