I have 2 engines. On one, which we raced, the header at the restrictor/flex is nice and dry and brown.
The other one, which I had a hard time starting, but now have running thanks to an external starter, is oozing a ton of black oil at the header/flex. Is this from a) all my failed starts that flooded the engine b) normal c) my fuel is not mixed anymore from sitting, and the oil has separated from the fuel? Or is this symtomatic of a bigger problem eg rings being loose?
Can this excess oil damage the exhaust pipe? Should I use 2 different pipes for each engine too?
If you had a lot of failed starts, my guess is the engine was flooded badly. The gas evaporates, leaving an excessive amount of oil that is now blowing out the exhaust. The oil won’t damage the exhaust pipe.
No. Are your truly “backfiring” or is the engine missing? What ignition system are you running (push button box or key start?). What are the settings (number of turns) on your carb?
Incidentally, splatter and leakage and general “spluge” from a 2-stroke exhaust is pretty much a fact of life. Had it in my Honda shifter; had it in my Leopard. The only question is where will it come out? On my Honda the weak point was at the exhaust port. On the Leopard it was the flex. My X125T is very well sealed, so it comes out at the end of the muffler and I wipe down the end of my bumper a lot.
Jim, Backing firing seems to have cleared itself after proper adjustments. No longer leaking crude oil at the exhaust flex. Key start and always open for suggestions on low and high turn out. Thanks for responding.