| Author | Message | ||
     Tyler7686 |
The bike is stock except for a air filter and a vance and hines exhaust. The bike backfires consistently whenever I let off the throttle while cruising. When I pull in the clutch to shift up it backfires. Downshifting it backfires. Anyone else have this problem How do I fix it? | ||
| Buell_bert |
Please look at the intake seals and replace them and coat them with a sil-glyde compound first. | ||
| Lakes |
Also check where the exhaust pipe fits to head is sealing as if exhaust gasket leaking or the pipe is a loose fit they will do that. | ||
| Robertl |
My m2 is stock with a v&h muffler. Had to rejet my carb and it cured all my backfires. Runs better than ever actually. Increased small jet 1 size and shimmed the needle with 2 or 3 small washers. Didn't even have to remove the carb. | ||
| Ratbuell |
Also check to see if you have any packing left in the "muffler"... | ||
| M2typhoon |
Is it backfiring only when you lift? On the gas it does not? | ||
| Whittenz |
Mine does the same dang thing but found if I run it with the choke slightly on it doesn't do it so I'd say the jetting is the issue and mine will at cruising speed | ||
| Robertl |
If the choke makes it run better (stop back firing), it is definitely lean. This is the reason I like a manual choke because it has helped me limp home on several occasions. Increase the slow (small) jet 1 size (stock should be 42, so go to 45). Will make you, your bike, and the people around you much happier. Buellistic wrote/has a OEM CARB Class 101 so just send him a pm to request. Tuning carbs is not rocket science or all that difficult but it can take several attempts to get it right. EZ helped me a few years back and I will forever be grateful. I can tell you from personal experience, the $5 jet and $3 air cleaner gasket was the best money I spent to date. | ||
| M2typhoon |
You may want to check exhaust gaskets. | ||
| Buellistic |
EXHAUST SYSTEM Class 101 and INTAKE(carb.) SYSTEM Class 101, just PM me for copies ... (Message edited by buellistic on July 02, 2014) | ||
| Mhlunsford |
Mine did the intake seals | ||
| Captainkirk |
Could be several things: "Keihin Cough"....cured by jetting up in some cases (or chucking the Keihin in the gravel and bolting on an HSR, as I did...) Leaking induction seals Exhaust leak Bad VOES switch |
