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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Need Help Bike Wont Start
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[QUOTE="rmc_olderthandirt, post: 1196822, member: 68872"] The idea of taking sandpaper to a sparkplug bothers me..... Just be very careful that you don't leave any bit of sandpaper grit down in the sparkplug. You really, really do not want those dropping down into the cylinder. To find out what is wrong, start with the basics. In order to run, an engine needs air and fuel (mixed in the proper proportions), compression, and a spark (at the proper time) to ignite it. You have obviously kicked the starter a bunch. You should be able to feel the compression. If if kicks over easier than it used to then you should get a compression tester and make sure that you have adequate compression. If you have been kicking the bike a few times and it won't fire, then pull the plug. If it comes out bone dry then you most likely are not getting any gas. You could be out of gas, the valve could be turned off, there could be a clog in the line, the float valve could have stuck closed or the jets could be clogged. I doubt that the jets would clog as a result of a crash, the fuel valve is on the left so it is unlikely that the fuel line got kinked or otherwise damaged, and I am making the assumption that you have gas in the tank. It is possible that the impact damaged the float, but I doubt it. If the plug is wet then either it is flooded, the plug is fouled or you are not getting spark. Put the plug wire back on the plug, hold it against the cylinder head and kick the starter. You should be able to see a good, healthy spark across the tip of the plug. If you don't then either the plug is fouled or there is something wrong in the ignition. I recommend swapping in a new plug. If you still don't get spark, then check your kill switch, it is possible that in the crash the kill switch took a hit and has shorted out. Check all the wiring to see if something was jarred or torn loose. If you are getting spark, compression and gas and it still won't run then it is likely that the engine has badly flooded. The air to gas mixture has to be correct, too much gas is as bad as not enough. It is possible (in fact, it happens a lot) that a bike laying on its side will allow gas to flow out of the carburetor and directly into the crankcase. You can end up with a sizeable puddle of raw gas down in the crankcase, and as long as it is there the bike will never run! If you turn the gas off at the tank, hold the throttle wide open and kick it enough it will eventually dry out. You may wear your leg out before this happens, however. You can speed the process up a lot by turning the gas off, removing the plug, turn the entire bike upside down (rest it on the handlbars), then operate the kick starter (by hand, it is a bitch to kick in this position) the engine over a bunch. If you see liquid squirting out the spark plug hole then keep kicking it until you don't see any more liquid. Turn the bike right side up, put a dry plug in, turn your gas back on and then try again. As for the bike stalling at idle; it is a common problem. If the bike will idle okay when in neutral but won't idle in gear with the clutch in it is probably because there is excessive amount of "clutch drag". Changing the gear case oil can help, and you might be sucessful at simply increasing the idle speed, but if the problem persists then the only real solution is to tear into the clutch and find out why it drags so much. Rod [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Need Help Bike Wont Start
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