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2005 yamaha yzf250 died?
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Posted by: blueblood---------------------
So I've had this bike for almost a year and ridden it very little. It always started and ran fine. The previous owner had a big bore kit installed. He also had new valves put in a few weeks before I bought it. Other than that its stock. One day while riding, it just flooded out and died. I had been riding for about 5 min. and it wouldn't restart. I pulled the plug and it was wet and black so I changed it. Checked and I have spark but won't start to save my life. The new plug was wet after a few attempts to start it. Any suggestions to what went wrong with the bike?
Posted by: nikki---------------------
Since you have spark, I would suggest pulling off the valve cover, putting the timing marks to TDC (top dead center), and checking your valve clearances. If everything looks good, than it is probably something else, but that should be a good place to start.
Since you say it "flooded", could also be something with the carb (maybe a clogged jet or something), but I would check the valve clearances first.
Posted by: blueblood---------------------
I talked to a guy today and he said maybe its the floats sticking. I wanna do my own work on my bike like I do with my trucks, but this is my first bike and I don't have alot of knowledge on small engines. I'll check the valves and see if the tolerances are off. With them being new, its a possibility. Thanks for the quick response!
Posted by: rmc_olderthandirt---------------------
My experience is that when the float sticks open gas will pour out the overflow tubes but it will still run. Might be a little harder to start and may not idle but it will run.
A possible exception is if the overflow tube has been capped off or re-routed. It is essential that the tube route in such that the gas can flow out without letting the level get to high. If you plugged the tube or routed it high to stop the flow of gas then the gas will flow into the engine instead.
If you suspect that the engine is flooded, and especially if you think that the float might be sticking then I recommend that you shut the gas off at the tank and proceed to try and clear the flooding. I would take the sparkplug out and kick it over a bunch of times. No throttle, leave it alone. The engine will draw air in through the spark plug hole and clear out any gas sitting in the cylinder.
Make sure that the plug will fire (put the wire on, set it on the cylinder head, kick it over while watching the plug). Put the plug back and kick it a few times without opening the throttle. If it doesn't start then open the throttle wide open, hold it there and kick it over a bunch of times. DO NOT open and close the throttle, just hold it wide open.
If all else fails, have a couple of buddies give you a push and bump start it.
Rod
Posted by: blueblood---------------------
Thanks I will try these options. Are there any notorious problems with these bikes? So I can know what to expect, cause like I said this is the first bike I've owned.
Posted by: whenfoxforks-ruled---------------------
Order up a shop manual.
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