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Motorcycle Forum / General / Yamaha / September 2005Backfiring problem
Hi all, I have a 1978 Yamaha XS750SE. Last fall I started it, and while warming up, it quit. When I try to start it now, it backfires (loudly). I would like to know what the causes of this might be and what to look for to cure this. Thanks I had a similar problem it was dirty carbs,however it can also be caused by faulty ignition > Hi all, > I have a 1978 Yamaha XS750SE. Last fall I started it, and while warming > up, it quit. When I try to start it now, it backfires (loudly). I would like > to know what the causes of this might be and what to look for to cure this. > > Thanks >Hi all, > I have a 1978 Yamaha XS750SE. Last fall I started it, and while warming >up, it quit. When I try to start it now, it backfires (loudly). I would like >to know what the causes of this might be and what to look for to cure this. > >Thanks dump out the sh.t gas. flush the lines with clean gas. flush the tank with a little clean too. then clean the carbs..yeah, all 3. then check the points to make sure they are good and set correctly. then go ride. btw, check them sidewalls...are the tires ok? > Hi all, > I have a 1978 Yamaha XS750SE. Last fall I started it, and while warming [quoted text clipped - 3 lines] > > Thanks Sounds like flooding, the carb needle valve is sticking , need to drop the bottoms of the carbs to check! > Hi all, > I have a 1978 Yamaha XS750SE. Last fall I started it, and while warming > up, it quit. When I try to start it now, it backfires (loudly). I would like > to know what the causes of this might be and what to look for to cure this. > > Thanks Backfiring is generally caused by one or more of three possibilities: - Raw gas hitting a hot exhaust system. - Timing either firing the spark plug while the intake or exhaust valves are open. - Bad valves. You can diagnose for bad valves with a compression test. You can diagnose for timing by checking the manufacturers specs. for degrees off top dead center. Knowing if it is backfiring through the carb. or the exhaust will help indicate timing. Raw gas in the exhaust will indicate carbs. Good luck. Serge Did you fix this problem? Do you still have the bike? (I'm still riding my '78 Yamaha 750 Special, or XS750SE Still enjoying it.). > Hi all, > I have a 1978 Yamaha XS750SE. Last fall I started it, and while warming [quoted text clipped - 3 lines] > > Thanks |
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