I have a 2005 YFZ450LE, When I push the start button it will crank but drains the battery almost immediatly, I replaced the battery and the same thing happens. I checked the starter clutch one way bearing and thats fine, but the torque limiter/ starter damper doesn't turn by hand is it suppose to?

no its not suppose to turn by hand buh my son had a problem like this with his lil 80 it could be your chip managing your bayyery or your whole whire harness i replaced the wire harness system witch is all the wireing+more and it worked so give that a try

Thanks for the tip, Joe.

Hope that helps you out a bit, Stan.

My ATV doesn't have a starter, so I was attempting to chase the info down from one of my ride buddies. But it appears he took off riding for the 4th of july holiday, so I haven't been able to contact him....

If the chip/wiring harness isn't the culprit, let us know and we will see what else we can come up with.

Since the battery is draining out, I am thinking that the chip, the harness or even the switch is defective, and is staying in the "open" position, causing the battery to drain.

Before you pull the harness and replace it, I would take it to a dealer you like and have them do a diagnostic test on it. They will probably charge you some sort of fee to do this, but it would be cheaper than replacing the suspect items one by one until you discover the problem.

I checked the Yamaha site, and there are no recalls posted about this problem...

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Thanks for visiting and using the forum, it was set up to work just like this, so we can all help each other out.

Ride Safe. Ride Legal. Ride Again...Curtis

If all else fails Check out the compression relese on
the exaust cam I had one in once with the tip of the
plunger broken off & not holding the exaust valves open
to release compression while starting.