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ThumperWR450F

kick starting !!

14 posts in this topic

anyone having trouble kickstarting there wr450's? kick starting seems to be getting worse as the bike breaks in. the first day i got it ,it started up on first kick. now it takes like 10 if not more to start it. do you think i should go up to a 72 starter jet ? once the bike runs and i stop it ,i push the e-start and she starts right up. i think it has alot to do with it being cold and the fact i hadn't ridden it in a few days. any suggestions guys?

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What jetting and mods have you done? My bike kicks over easier than any for stroke I have ever owned.

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Read some of the post on jetting and play around with the fuel screw setting. Also are there ever any strange grinding noises or hicup type backfires when you use e-start? If so it is probally a good idea to check your woodruff key. I chased my tail for two weeks with jetting and starting issues before finding out my bikes timing was off from flywheel spun on broken woodruff key.

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My timing was off just enough to have me chasing a jetting problem. It never failed to start or run it just kept running bad. I used the puller from the shop I bought the bike from to pull the flywheel and replace the woodruff key. The jetting I originally came up with is in the bike now and seems to run great at this point.

As soon as I get some more time on the bike I will play around with the YZF jetting some more.

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Usually but not always.. when the woodruf key is sheared the flywheel will pull off by hand very easy. not always but most of the time.

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Sometimes a sheared key only moves the flywheel a very small amount, so it is possible for a bike to still start since the timing would only be off a little bit.

Also an offset woodruff key is one way to change ignition timing on an engine.

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Jim, I just wanted to tell you that my shop checked my rotor bolt torque and pulled the flywheel off and retorqued several times per Yamaha instructions, as a preventive measure for the woodruff key problem so there must be a tool out there. BTW I've never had I problem yet,but I still think about the woodruff key once or twice every long ride. I am suprised that it didn't happen to more bikes if there was a problem...

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