opdeweegh1 Posted May 22, 2005 Report Share Posted May 22, 2005 I have been running my 300 pro @ 80:1 mix for quite a while and it runs fiine however it always seems smokey when going up hill. Sometimes ends up with the plug fouling also. Have tried screwing in the air mixture screw a bit to make it run a bit leaner. Anyone got any ideas, thought about maybe jetting up / down any thoughts / experiences with tuning for optimum performance from the 300 pro? Quote Link to comment Share on other sites More sharing options...
jenkinsm Posted May 23, 2005 Report Share Posted May 23, 2005 Have you altered any of the carb settings since new? Also the mixture screw should be 3 turns out in this weather. If you aint changed the jetting from new its possible you would have had to wind the mixture screw out a fair way as they run weak on the standard main jet (Especially in winter), they need the next one up. Also check the end of your HT lead as often the end of the lead gets burnt away and this results in a weak spark which leads to bad combustion and thus it will run a bit funny. Good luck Quote Link to comment Share on other sites More sharing options...
opdeweegh1 Posted May 23, 2005 Author Report Share Posted May 23, 2005 Cheers. Was planning another srip down anyway so will clean ou the exhaust and try a bit of tinkering. Thanks for the info. Quote Link to comment Share on other sites More sharing options...
tombleds Posted May 27, 2005 Report Share Posted May 27, 2005 I have had to replace a left side crankshaft seal that was leaking it was sucking trans fluid into crankcase gasgas has a little passage where oil lubricates the left side crank bearing sometimes the seals got folded over in production also good luck hopefully just jetting but if it ran fine before crank seal would be suspect Quote Link to comment Share on other sites More sharing options...
jools Posted May 27, 2005 Report Share Posted May 27, 2005 Just a Basic check, you are running it on fully synthetic oil and Superunleaded petrol!? 75cc's (ml) oil to 5 litres petrol Quote Link to comment Share on other sites More sharing options...
opdeweegh1 Posted May 27, 2005 Author Report Share Posted May 27, 2005 Jools. When you said that you replaced the left side crankcase seal, that is the seal behind the flywheel yeah? Did that mean you were losing oil from the crankcase? If the seal had rolled on installation would it not leak into the flywheel cover also? Cheers. Quote Link to comment Share on other sites More sharing options...
tombleds Posted June 1, 2005 Report Share Posted June 1, 2005 no it didnt leak into flywheel it had two seals if I remember right one on each side of the crank bearing it was the inside seal that rolled over Quote Link to comment Share on other sites More sharing options...
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