Digger65 Posted September 26, 2018 Share Posted September 26, 2018 Hi forum I did try to get to the bottom of an issue I had a while back but never really got there so hoping this time I can get to the bottom of it 76 DT175 Bike runs ok (although air screw pretty much full in), can start easily with No choke, pulls well..for a while After 10 15 mins it suddenly loses power and lots of blue smoke seems to be worse if forced to idle, say in traffic Put a new carb on it Burnt out exhaust with heat gun Running with air filter Running on oil pump Would crank seals cause this? Weak spark from primary coil breaking up when hot? Any suggestions or knowledge most welcome before I just start throwing parts at it Thanks in adv D Link to comment Share on other sites More sharing options...
Moderator Cynic Posted September 28, 2018 Moderator Share Posted September 28, 2018 Define 'new carb'. New as in quality replacement mikuni, new as in good second hand or new as in cheap and horrible Chinese crappy copy. Did you check the size of the jets, if their clear? It starts with no choke and the air screw is fully in so something is up in the carb, no matter how you spin the bottle its rich and sounds like its choking out once its warm. 1 Link to comment Share on other sites More sharing options...
blackhat250 Posted October 1, 2018 Share Posted October 1, 2018 check the gearbox oil level, if its low ,it will be R/H crank seal [sucking oil] = smoke, and the pilot is too small if you can screw it fully home without stalling the engine, [at idle] ,,, plug colour ? tells a lot, Link to comment Share on other sites More sharing options...
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