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1993 KLX650C backfiring when turned off??

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Are you having a surging issue when going at a steady speed ? Does it start hard cold ?  Often lean jetting can let extra gas in the exhaust which can ignite(backfire) but it's not real common when just shutting off. I have 2 KLX's('95 & '96) and can't say they've ever backfired . Do you know by chance what jetting you have ? How does it seem to run otherwise ?  Stock muffler or aftermarket ?

 

I've switched both of mine to FCR41's ,that spices them up nicely . The stock CVK carb they come with doesn't cohabitate with that particular motor very well.

Edited by jjktmrider

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I'm gonna say too rich. extra fuel is in the muffler & when the engine is running, there is no extra oxygen in the muffler to burn the fuel. it lights off once the engine stops because air can get through the tailpipe. you can get lean backfire because the mix is still burning when the valve opens (lean mix burns slower), but as mentioned above, thats during running

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