If you have gas fouled plugs, first thing you need to do is clean them or better yet get a new set.
Don't think you need a big 50 CC pump.
You could also be too rich if you are back firing out of the exhaust.
Really need to get rid of those plugs because once you gas foul them they do not come back to working good just by running the engine.
Idle is good ,,,but smells rich?
MBHD
