99 WR400sm bad back fire/popping
Posted March 15, 2009 - 08:16 PM
Posted March 16, 2009 - 02:30 AM
Posted March 16, 2009 - 04:41 AM
Posted March 16, 2009 - 04:29 PM
Any more suggestions.
Posted March 16, 2009 - 05:12 PM
- lean pilot circuit
- air leak at exhaust
- air leak at intake
Check for leaks with a can of brake cleaner on the intake side.
If you went up to a FMF, you are scavanging more exhaust, which means more air is getting in too: you need to richen your pilot circuit. Try going to 2 turns out on the fuel screw. If no change, you need a bigger pilot.