gasgasshetland Posted August 19, 2016 Report Share Posted August 19, 2016 Bike has started spluttering and backfiring and when revved hard it belches black smoke and flames at times come out e silencer. Any ideas on what's happening. Quote Link to comment Share on other sites More sharing options...
zuendapp Posted August 19, 2016 Report Share Posted August 19, 2016 A little more info maybe helpful? What year is bike What carb? Dellorto or Keihin ( have you drained float bowel for water / contamination ) How long have you owned bike? Have you changed the spark plug? What type of gas, race fuel or pump gas? GasGas bikes after longer rides on fast roads, the mid pipe will catch fire and burn excess oil and sometimes melt plastic end cap. Quote Link to comment Share on other sites More sharing options...
arnoux Posted August 19, 2016 Report Share Posted August 19, 2016 Sheered flywheel key. 1 Quote Link to comment Share on other sites More sharing options...
gasgasshetland Posted August 19, 2016 Author Report Share Posted August 19, 2016 (edited) 2014 pro racing had it from new. Fuel is from pump. Not race fuel have used octane booster in the past but stopped using it. Have been running it with a bit too much 2t oil in the fuel. But now running 62/65 ml per 5 litres as advised by GasGas mechanic. No3 slide in the keihin pwk28 carb. New plug installed as well. Inline fuel filter fitted and have just set float height to standard setting as they were a bit off. Edited August 19, 2016 by gasgasshetland Quote Link to comment Share on other sites More sharing options...
lineaway Posted August 20, 2016 Report Share Posted August 20, 2016 (edited) Have you recently done anything new. Powder coat frame? Clean bike, ride in a pond. ETC. Otherwise it`s a new stator. Edited August 20, 2016 by lineaway Quote Link to comment Share on other sites More sharing options...
anotherfive Posted August 20, 2016 Report Share Posted August 20, 2016 Flywheel woodruff key is first choice. Happened to me on my racing couple of years back. Sounds terminal but isn,t. Quote Link to comment Share on other sites More sharing options...
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