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Title: ATV won't start.....Help Me Post by: 02YamahaBigBear400 on September 02, 2008, 10:07:52 PM Hey guys maybe someone can give me an idea to whats wrong. I have a bigbear 400 4x4 and 3yrs ago i was pulling a friend out of a mudhole but my bike was idling as i was trying to relocate the rope for a better pull. Well the bike shut off. Since then i haven't been able to start it. 3 yrs later, I've taken it outta storage to work on it. Just the other day i checked for spark......got that, gas......its getting that, carb and tank are cleaned out and fresh gas has been put in. It still won't fire. Every now and then I'll get a backfire or it pops my carb off the boot going to the cylinder. I haven't done a compression check but I have stuck my finger over the spark plug hole and it blows my finger off. I'm clueless to what has happened. Can some help or have any idea to what is wrong. Thanks
Title: Re: ATV won't start.....Help Me Post by: yz450f rider on September 02, 2008, 10:19:53 PM try straight wiring the kill switch ;) was it idleing in water??
Title: Re: ATV won't start.....Help Me Post by: 02YamahaBigBear400 on September 03, 2008, 12:27:59 AM it was out of the water on land. my friends was in mud. but the kill switch works cause if i kill it, it won't let me crank it. I'm thinking my timing or my valves. But i never had my valves knock or right now as i crank it I don't hear anything knocking around.
Title: Re: ATV won't start.....Help Me Post by: bocephus300 on September 11, 2008, 09:17:03 PM id say it maght of jumped a tooth in timing or the chain tension is bad. cause its blowing the carb off, meaning its sparkink while the intake is open or partially open.
Title: Re: ATV won't start.....Help Me Post by: grizzlefoshizzle on September 11, 2008, 09:29:51 PM check the parking brake out if its on it wont want to start cause of its weird
Title: Re: ATV won't start.....Help Me Post by: MuddFreak77 on October 04, 2008, 10:33:11 AM Its a timing issue, as was already said if its blowing the carb off its sparking while the intake valves are open. Check the timing chain.
Title: Re: ATV won't start.....Help Me Post by: MadMudder on October 04, 2008, 05:27:14 PM I agree its either a timing issue or your carb might be loose. Id check both.
Title: Re: ATV won't start.....Help Me Post by: scrimmy on October 08, 2008, 09:18:27 PM ^^^^^^ agree
Title: Re: ATV won't start.....Help Me Post by: 4fittyr on October 12, 2008, 04:27:18 PM if its a yamaha my buddies raptor wouldn't start did a valve adjustment not much paper thin but the intake was closing before it could fire so opened up a lil more than need .0003 on mic cause their gonna close up again hope this helps fired rite up
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