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1996 polaris 425 magnum. Idles great. Backfires through carb

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1996 polaris 425 magnum....
1996 polaris 425 magnum. Idles great. Backfires through carb when you give it any gas. Cleaned carb and same thing. Air box is off so I can see slide moving so I take it the diaphram is doing its job. I also see a fire ball in the front of the carb when I give it gas. Seems like it is getting too much gas but the plug is bone dry. Choked it and same response. Should full choke kill it because it just seems to lower idle. Also I heard these had a habit of the cam getting flat.
Submitted: 8 years ago.Category: Motorcycle
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Answered in 20 minutes by:
12/29/2009
Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago
CH motorsports
CH motorsports, Technician
Category: Motorcycle
Satisfied Customers: 25
Experience: Atv,motorcycle,sled mechanic for 10 years. Owned Small engine repair shop for 4 years
Verified
Does it miss like it does when you are in reverse with out pushing the button?
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Customer reply replied 8 years ago
Kind of but it seems to be worse than that. As soon as you give it almost any throttle it misses so bad it about kills it.
Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago

When it is at full choke will it rev or no?

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Customer reply replied 8 years ago

no

 

Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago
Have you checked the valve clearence?
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Customer reply replied 8 years ago

No. Could you give me a crash course on how to do that? Also how many turns should the fuel/ air screw be turned out?

 

Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago
On the mag you need to pull the tank to gain acces to the valve cover. Once you have the cover off, pull the plug on the recoil housing,there is timming marks on the flywheel. Bring it to top dead center,there is also a timming dot on theupper cam gear.At this point all four rocker arms should be loose. You need to set the clearence at .006 int. and ext.If you look at the ext lobe[center lobe] of the cam it should be fairly pointed if it is rounded it is junk. Fuel screw should be about 1 1/2 turns from seated, but if the choke does not seam to help I doubt that the screw has any thing to do with your problem.
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Customer reply replied 8 years ago
.006 on int .009 on ext
Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago
According to my book they are both .006 but my book is for a 97' could be different but as far as I knew all polaris's are the same int and ext.
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Customer reply replied 8 years ago
Could they be just out of adjustment on the exhaust? And if it was flat I take it that they would not open far enough or would the duration they are open be too long on a flat cam?
Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago
It's possible that they are just out of adjustment but I doubt it. When the cams are wore out the valves do not open enough to let the ext. escape the cylinder.
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Customer reply replied 8 years ago

Ate lunch and decided to take rockers off and take a better look. Exhaust rocker and cam lobe are both worn. Just got wheeler so maybe someone was in it before and adjusted them so they would open. Anyways, you have any last words of wisdom on cam replacement before I quit bothering you and hit the ole accept buttonm?

Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago
Not much to reccomend other than make sure that your cam timming is on when you install the new cam. Check your rockers when the cam goes it usually takes them out also. In my experence the most common cam failures are do to some other type of oil than the polaris 0w50. Hope i've been of help to. If you need any thing else don't be afraid to shout.

Edited by CH motorsports on 12/29/2009 at 10:13 PM EST
CH motorsports
CH motorsports, Technician
Category: Motorcycle
Satisfied Customers: 25
Experience: Atv,motorcycle,sled mechanic for 10 years. Owned Small engine repair shop for 4 years
Verified
CH motorsports and 87 other Motorcycle Specialists are ready to help you
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Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago
If you don't need any more info please hit the accept button.
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Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago
1
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Motorcycle Mechanic: CH motorsports, Technician replied 8 years ago

Please accept if there is nothing else.

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CH motorsports
CH motorsports
CH motorsports, Technician
Category: Motorcycle
Satisfied Customers: 25
25 Satisfied Customers
Experience: Atv,motorcycle,sled mechanic for 10 years. Owned Small engine repair shop for 4 years

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