Question about Yamaha 1983 Xj900 Xj700 Xj650 Xj750 Stator Alternator Generator

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My xj900f has a nasty backfire from the carbs and the exhaust. And it does in all throttle positions. I replaceced ecu cleaned. Tank carbs ect please help at wits end

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The problem is either, too lean a fuel mixutre, ign timing module is loose, or damaged plug leads/plugs or the intake is drawing secondary air from a loose / bad gasket in the intake manifold or carb leakage. Also perform a leakdown test to confirm valves are sealing. I assume the valve adjustments have been checked also?

Posted on Nov 19, 2013

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1998 artic cat 454 sputters and backfires when I let off the throttle


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BACKFIRE TROUGH EXHAUST IS A VALVE TIMING ISSUE!
WHILE ON THE POWER (EXPLOSION) STROKE...EXHAUST VALVE IS OPENING TOO SOON ...WHILE FLAME PATH IS STILL IGNITED, SENDING IT OUT EXHAUST. I WOULD PERFORM A VALVE ADJUSTMENT AT A MINIMUM

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Backfire when throttle down can be;
1. dirty carbs that are running lean and need cleaning. Also the rubber grommets that hold the carbs can be leaking at the backside or even dry rotted.
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1984 GL1200 Goldwing... 80k mi. ....bike will not run without choke on 1/4 to 1/2 open... when given throttle, the engine backfires and blows black soot out of exhaust... new spark plugs with gap set at...


This sounds like a fuel flow problem. I suggest removing and rebuilding and cleaning the entire system, meaning Carbs, filters and strainers in the tank. Old fuel turns to gel, and floats absorb fuel, sometimes, so inspedt everything. When finished set carbs with carb sticks, both at idle and at 2000 RPM, using hand throttle.

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My 1999 Honda shadow backfires on deceleration after steady throttle what could cause this? I have tuned it and cleaned the carb but it still does it.


The most common reason for backfiring is lack of back pressure from changing the exhaust. To compensate for the flat spot you get you put in a jet kit. This leaves the possibility of more unburned gas getting into the exhaust. Honda uses Kei Hin carbs with a fuel shut off diaphragm to help limit this condition (backfiring) by turning off the fuel to the carbs during deceleration. Even stock exhaust can pop or backfire. Typically it is caused by air getting into the exhaust either past the copper o-ring gaskets in the head or leaking muffler connections from the head pipes to the mufflers. Try replacing all the exhaust gaskets and you should minimize this condition.

Sep 05, 2010 | 1999 Honda VT 750 CD Shadow A.C.E. Deluxe

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Idles great in neutral but not in drive or reverse the truck surges , upon acceleration it stumbles and bucks and back fires through the carb and after about a 1/4 mile it runs normal. but it still has the...


Try this website for resolving car problems by downloading a FREE service manual for your vehicle. This is not an owners manual but a factory mechcanic's manual.

http://ezinearticles.com/?Find-the-Free-Auto-Repair-Manual-You-Need-Online&id=92717

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1 Answer

My sportster backfires constantly. How can I resolve this problem? I had the carburator cleaned and adjusted, but it still backfires.


Ok, due to different terminology used by different people, I'm going to assume that by "backfire", you mean it pops through the exhaust system when you back off the throttle. On stock exhaust systems which use the "crossover" connector to connect the front and rear pipes, the backfire is usually caused by an air leak somewhere in the exhaust system.

When you back off on the throttle, the mixture is usually too rich to burn in the exhaust system. But, if you have an air leak allowing the scavenging effect of the system to **** air in, the mixture becomes combustable and is ignited by subsequent exhaust pulses.

Check your exhaust system gaskets and replace them if necessary. This should stop your problem. Rejetting the carb may be necessary as well.

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Motorcycle "back-fires" and often runs on one cylinder


Does the bike backfire only when the throttle is being closed? The carbs have a idle enrichment circuit. If the idle enrichment diaphragms are stuck in the closed position, the bike will backfire when the throttle is shut down. You can't remove these parts for cleaning without seperating the two carb bodies (and then needing to synchronize the carbs after reassembly). A trick that worked for me...fresh fuel, and some fuel system cleaner in the tank...ride the bike at highway speeds for 20 -30 minutes...repetedly rev the engine to a high RPM then shut the throttle closed. The repeted application of high engine vaccum to the enrichment diaphragms freed the stuck diaphragms and the fresh fuel cleaned any gum and varnish that caused the trouble. I've put 20,000 miles on it since then with no backfiring.

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