toyota celica 04 performance exhaust system help!!?
don't be penny-wise dollar-foolish. do the carbs. Yamaha sells an additive called ring free i believe that might help. but if one jet in one carb. is plugged you can ruin an expensive engine.
A cat-back exhaust and a full exhaust are NOT the same thing But if the cat is welded on and you dont have the tools to cut and re-weld them than your gonna have to buy a new cat with the cat-back exhaust. Just unbolt the exhaust from the manifold and install the new cat and cat-back exhaust.
You should be able to just clean your carbs by removing the carbs and pulling the float bowls off. Use carburetor cleaner to clean off the varnish. (just go to your local auto parts store for this its nothing special) Make sure you shoot cleaner into all the passages to clear them out. I pulled the jets out of mine to do this. If you move any adjustment screws make sure you set them exactly in the same position (you shouldn't have to adjust them after your finished). Your carbs probably use rubber gaskets that can be reused if not buy gaskets. (I only had to buy the carburetor cleaner and no other parts) This worked for my 150hp V6 Evinrude that would run exactly like your speaking of. You will have to do all the carbs. I had 3 of them. Use Stabil when you store it like the other guy suggested and you shouldn't have this problem again. Good Luck, I hope this helps.
get a can of Marvel Mystery Oil. put some in the engine,ware the spark plugs are, some down the carb and with the fresh fuel. There will be some intense smog, but if the mill is alright it will all come back to normal, after while.
