old trials fanatic Posted February 8, 2012 Report Share Posted February 8, 2012 I've got an OSSA TR77 that i'm doing up at the moment and it's a 250. Got no carb on it but i have a Bing off a 350 TR77 so i was going to fit that. Just wondering if anybody knew the jet sizes for the 250 as i assume they are possibly smaller than the ones for the 350 ? also the carb is leaking petrol. Now i thought it was flooding but after stripping and turning upside down the float needle seems to be sealing ok when i blow through the fuel pipe and there doesnt seem to be any fuel in the float which would normally indicate a punctured float. The float needle valve doesnt seem to be worn either. So only other thing i can think of is the gasket for the float bowl. Are these known to be problematic? All helpful suggestions gratefully received Quote Link to comment Share on other sites More sharing options...
dadof2 Posted February 8, 2012 Report Share Posted February 8, 2012 Following is a bit messy but worth a try. Remove the carb and tank from the bike, then with the float bowl off turn the fuel tap on and see at what float position / height the flow into the carb actually shuts off. Also check the floats are not catching any part of the bowl or jets that is resricting their movement. Cheers Quote Link to comment Share on other sites More sharing options...
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