Question about 2006 kawasaki KX 250 F

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I have a 2005 kx 250f backfire and no start

I have a 2005 kx 250f and just replaced shift forks and now i have backfire but no start whats going on

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Chances are when the OHC was installed it was one tooth off on the timing. You have spark and gas and the bike is a single cylinder so that is what I would check. Slack in the chain tensioner is what usually creates the problem. All slack should be at the back side of the cylinder.

Posted on Jun 17, 2009

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Hi, my 1994 KX 250 will not engage 4th gear - all the other gears are OK. When in the 4th postion there is a knocking noise like the dogs are not engaging. When I took it apart everything looked OK the...


The worn shift fork is the problem. Normally a shift fork will never show any wear. When a fork gets bent is when wear begins to show. If a good shift fork is set side by side with a bent fork it is very hard to see any difference. The bend is so slight that it is usually impossible to discern. Put in a new fork and the shifting problem is history.

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If it is the forks, then the entire engine comes out of the frame and gets completely torn down. The top end comes off, the case covers come off, the clutch, shift shaft, kick starter, flywheel and electrics all come off. Then the case is split to gain access to the gears and shift drum. The gears and shift drum now get removed and now the forks can be replaced. A few special tools are needed. Sorry for having to give you the bad news.

A “very helpful” rating for this answer? Thanks!

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