grizz carb blow off
Sep 27, 2006 | 08:48 AM
#1
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Weekend Warrior
Joined: Sep 2006
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grizz carb blow off
have an 01 600 grizz that back fires out the intake blowing carb off....any one ever have this issue befor ?? put a crab kit in but never helped
almost burned up the other day cause of it
almost burned up the other day cause of it
Sep 29, 2006 | 05:34 PM
#3
Pro Rider
Joined: Jan 2006
Posts: 298
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grizz carb blow off
Running too lean can also cause backfires out the carb. I would do a full tuneup. Also, carb problems are based off throttle position.. So if it only happens at idle, you may need to adjust your air/fuel screw..or check for a clogged pilot jet. If it happens in the mid range, check your needle clip. If it happens at full, try a bigger main jet. If the thing back fires at any throttle range, it must be a problem covering all your jetting like a leaking intake boot or air filter. Whenever trying to fix a carb problem, start out in one area.. Changing the needle or main jet will never fix an idle problem.. just like adjusting the air/fuel screw will never fix a full throttle problem.
Another problem could be a sheared flywheel key. If someone didn't tighten the flywheel nut tight enough, the flywheel never gets a good pressed fit. This could cause the key to take most of the force and break if the motor was stalled really hard. The flywheel could have shifted on the crank and caused your timing to be off.. this would cause lots of problems related to overheating and backfiring. If you have a service manual, follow the guide for installing the cam sprocket. You don't have to remove the cam/sproket, you just want to make sure its still timed right to the flywheel. In most cases, the cam sprocket will have a mark of some sort that should line up correctly when the flywheel is set to TDC. You want to do the reverse of what the manual says since the motor should be timed correctly to the crank itself... so turn the crank until the CAM SPROCKET is where it should be for TDC and see what your timing window has to say. If this is still correct, you can rule out the flywheel and timing chain as a source of your problems.
Another problem could be a sheared flywheel key. If someone didn't tighten the flywheel nut tight enough, the flywheel never gets a good pressed fit. This could cause the key to take most of the force and break if the motor was stalled really hard. The flywheel could have shifted on the crank and caused your timing to be off.. this would cause lots of problems related to overheating and backfiring. If you have a service manual, follow the guide for installing the cam sprocket. You don't have to remove the cam/sproket, you just want to make sure its still timed right to the flywheel. In most cases, the cam sprocket will have a mark of some sort that should line up correctly when the flywheel is set to TDC. You want to do the reverse of what the manual says since the motor should be timed correctly to the crank itself... so turn the crank until the CAM SPROCKET is where it should be for TDC and see what your timing window has to say. If this is still correct, you can rule out the flywheel and timing chain as a source of your problems.
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