Back firing...

[Joe699]

I though I had sorted this out on my xs2, went to take it for a ride today and filled up on 91 octane. It popped through the right carb when I kicked it over and a slight backfire returned on that side.

When I got home I checked the carb, tried a couple of adjustments (butterflies, idle..)I also found no air leaks so I thought id put in some octane boost into the tank. After this a took it around the block and it did seem a bit better?

So, could the lower octane petrol (91) cause a slight backfire?

I'm about to go strip the carbs again just to recheck everything....


Thanks

 

[gentlemanjim]

Lean conditon, plugged or dirty jets - Leaking CV diaphram pin or tare in the boot - octane means nothing other than preventing detonation from high compression or over heating.

 

[Dakota]

try swapping the wires on your coils, they might be backwards depends on who did the points last time

 

[littlebill31]

Plug color tells a whole lot. Check your exhaust for leaks as well. Hot exhaust mixing with the cool ambient air can make it pop. Most likely a lean condition as Jim said.