Question by  M85 (172)

Why is my Susuki GS 750 backfiring?

My motorcycle runs rough.


Answer by  dganir (39)

There might be several reasons for backfiring though. You can simply tune p the engine and check if problem solves. You can also check spark plug wires if they are loose. You can check and replace spark plugs if they are worn. Also put correct octane of gasoline in motorcycle.


Answer by  dcornwell (63)

You either have a spark timing issue or the mixture may be too rich. If you have aftermarket pipes, you need to re-tune the engine. This is best accomplished by the dealership.


Answer by  Jon65 (787)

Check your spark plug wires to see if they are loose. Check and replace your spark plugs if worn. Make certain you're putting correct octane of gasoline in the motorcycle.


Answer by  Devadath (35)

Check your ignition timing, plugs to make sure everything is clean and gapped right, then give a big thick spark. Finally check the timing to factory specs is properly set.


Answer by  hypercatbed (142)

There could be multiple reasons that a motorcycle could be back firing. Doing a simple full inspection and tune up on the engine could just aswell solve the problem. Although going to your local auto shop and getting it inspected on site could get the problem solved much mroe quickly.


Answer by  jon40 (440)

Either your spark plugs are fouled or your carburetor is dirty. Anouther possibility is a cracked intake boot. This allows it to suck way to much air. I'd check the carbs first, specifically the pilot jet (smallest one) and clean it entirely.


Answer by  Amber40 (24961)

Make sure your air/fuel mix is correct and not rich. Also if you have an bike with a vacuum operated petcock check to see it isn't leaking.


Answer by  ScooterMike (145)

Backfiring is typically caused by the motorcycle running to rich, you'll need to adjust your carb as necessary to lean out the air fuel mixture.

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