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Author Topic: ATV won't start.....Help Me  (Read 6563 times)
02YamahaBigBear400
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Wheres the mud?


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« 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
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yz450f rider
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« Reply #1 on: September 02, 2008, 10:19:53 PM »

try straight wiring the kill switch  Wink  was it idleing in water??
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02YamahaBigBear400
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Wheres the mud?


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« Reply #2 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.
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2002 Yamaha BigBear 400 4x4
27x10x12 Vampires (Front)
27x12x12 Vampires (Rear)
Custom Snorkel
Extra Lights w/custom grill
FMF MegaMax 2 exhaust
----------------------------------
1996 Honda 300 4x4
27x10(front) and 27x12(rear) vampires
exhaust
HL clutch Kit
Snorkel
am/fm cd player
bocephus300
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« Reply #3 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.
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grizzlefoshizzle
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« Reply #4 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
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MuddFreak77
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« Reply #5 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.
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MadMudder
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« Reply #6 on: October 04, 2008, 05:27:14 PM »

I agree its either a timing issue or your carb might be loose. Id check both.
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« Reply #7 on: October 08, 2008, 09:18:27 PM »

^^^^^^ agree
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4fittyr
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« Reply #8 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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