General question for yamaha

[irishluck]

So i was trying to start my yamaha today and when cranking it, on the far right carb there would be a puff of white smoke that popped out a few times.

Also i tried it again later and was cranking it, and it had a very loud backfire out of the exhaust pipe. And i could see a small flame.

Anyone know why this would be happening?

My bike has 4 carbs and is a 1200cc engine.

Just looking for general anwsers here.


Also i have cleaned the carbs very well, new needles and seats and all.

[RavensR1]

All that i can think of is oil something to do with the oil maybe, im a noob to this, so good luck!!