Question about K and N Yamaha Big Bear Yfm350fw Air Filter

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I have a 2004 big bear,it has a brand new battery, es20lbs everstart,it will only crank when you attach a battery charger to it and pull the crank rope. it will turn by starter but will not fire.when you crank it it will run great without the batteryeven being attached.even the lights will burn as its running without the battery. randy

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NEVER run it without the battery being attached!
Doing that risks voltage spikes that can blow out every single diode in the entire system.
If you had not done that, I would have just suggested perhaps it had a bad ballast resistor on the ignition coil or something.
But now I would have to recommend that all the charging circuit diodes be check with an ohmmeter. They should only have continuity in one direction.
Then you need to put a voltmeter across the battery and see if it holds up when cranking. If not, then either the starter is bad and drawing too much, or the new battery is no longer any good. It only takes a couple of hours to ruin a new battery if there is a bad enough drain on it. If the diodes are shot, the battery will drain even when just sitting while off, as long as connected.

Posted on Aug 29, 2010

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Posted on Jan 02, 2017

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