kev1180 Posted April 1, 2009 Report Share Posted April 1, 2009 i just bought 01 yzf 426 dirt bike and i am having trouble getting it to start when hot or cold. it has flat top piston, short rod, white bros full exhaust and diferent intake. is there any parts out there to make it start easier without have to roll start it. even when i use the hot start is almost kills me to turn it over. Quote Link to comment Share on other sites More sharing options...
cbr600f3 Posted April 2, 2009 Report Share Posted April 2, 2009 check the valves, prob outa spec very common on 4 strokes, especially older ones with time on them Quote Link to comment Share on other sites More sharing options...
ReconRat Posted April 2, 2009 Report Share Posted April 2, 2009 Yeah, if the head and/or jugs have been off, check to see if the timing chain is one tooth off. Easiest way might be to turn the timing till it starts. (Useless advice if it's electronic timing.) If it is way off from where it should be, the timing chain is probably one tooth off. It might already be set way off from what it should be, that's a clue. I've seen cars and bikes come back from the repair shops with the timing belt or chain off time.Warning: check and mark and write down what the timing is current set at, so you can put it back if you want to.If it's modified bore/stroke/compression, it might not be getting enough fuel. Spraying a little bit of starter fluid or fuel into the carburetor might make it start easier. Also another clue. Quote Link to comment Share on other sites More sharing options...
ReconRat Posted April 2, 2009 Report Share Posted April 2, 2009 Wait...If you mean it's just harder then Hell to kick start, then maybe the compression release should be used, it's got one.Linky about hard to start YZF426:http://www.thumpertalk.com/forum/archive/index.php/t-116978.htmlUsing a compression release when starting is a learned skill. It will take practice. Quote Link to comment Share on other sites More sharing options...
cbr600f3 Posted April 2, 2009 Report Share Posted April 2, 2009 definitely check the timing, the yzf's had alot of issues with stock timing chains stretching too. but the easiest and first id check are valves . also you can install the 450 cam with no mods and have auto decompression. they offer high compression pistons and long rod kits for bike but never saw a shorter rod? Quote Link to comment Share on other sites More sharing options...
JKOBD Posted April 2, 2009 Report Share Posted April 2, 2009 As others have said, check the valves and also confirm the jetting as well. Ever since moving to this state, my bike sucks at cranking in the cold. Need to make some jetting changes. Quote Link to comment Share on other sites More sharing options...
flounder Posted April 2, 2009 Report Share Posted April 2, 2009 check the valves, prob outa spec very common on 4 strokes, especially older ones with time on them+1 my guess.. Quote Link to comment Share on other sites More sharing options...
kev1180 Posted April 13, 2009 Author Report Share Posted April 13, 2009 not hard to start anymore. i fixed the problem by putting a hot cam with auto decompression in it. it starts as easy as my boys kx 65 now and run likes a raped demon. Quote Link to comment Share on other sites More sharing options...
siggywiggy Posted April 13, 2009 Report Share Posted April 13, 2009 good to hear you got it fixed. i too have a 01 426, we put a "powernow" on it and that seemed to help. I mostly just start my kick with the compression lever in and release it as i am kicking. Quote Link to comment Share on other sites More sharing options...
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