Sorry to bug you, but I have a problem that's driving me crazy!
I overhauled the top end of my piggy(piston rings, valves, seats, springs, camshaft bearings...you get the idea).
I dismantled the carb, cleaned it, set the level, needle setting(the needle is new)...etc.
1) the bike starts very hard
2) when it starts, the idle goes wild(from normal to 3000 revs)
3) very litle response from the air screw(new as well)
4) when I rev it, it dies after releasing the throtle
I suspect an air leak due to worn carb body and throtle valve(the only thing I didn't check). The intake boot is new.
I had this problem before the top end work, but it intensified after. More vacum/compression=more air leaking => leaner mixture??
I found crf 450 carburetors(FCR 41) on ebay. I'm thinking about buying one.
What say you?