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Yamaha MX & Off-Road Dirt Bikes
bike woulnt start tried putting a new plug in and still woulnt fire
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[QUOTE="NM_KDX200, post: 1224735, member: 38052"] You know, "power mechanics" was maybe the best class I ever took in high school (76-80). There, we learned all about compression, spark, and fuel systems. Don't they offer this class anymore? When you have a bike that doesn't start the first simple things to check are: a) compression? You can usually feel this by turning the kickstarter over by hand. It should be stiff and "snap" off the piston upstroke. Or you can test it, but engines generally lose compression slowly and just get gradually harder to start. b) spark? Ground the plug on the side of the engine and turn kickstarter by hand. Plug should spark. c) fuel? If the plug's wet, then compression is good enough to suck fuel into the engine and you're getting fuel thru the float bowl into the engine. Fuel is probably not a problem. I'd start working on "spark" until you get one. New plug, check for corrosion in the kill switch, moisture in the flywheel area, loose wires everywhere, etc. The 2nd most useful class I've ever taken (and this includes post-graduate study) was typing. Seriously! I took it in college and I've used it practically every single day since. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
bike woulnt start tried putting a new plug in and still woulnt fire
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