k3lv Posted February 17, 2023 Share Posted February 17, 2023 Hi all , I have a 2012 sinnis stealth 125 (winter hack,project bike,bit of fun) it didn't run when I 1st got it (bad starter relay) so replaced that it ran for a bit (badly) but now it just will not start at all , stripped the carbs a million times , checked the valve clearance at least 20 times an they are fine .....sometimes (completely random times) it'll start for a few seconds an die when the carb was on it would turn over an when I stopped it would make a hissing sound ....without the carb it makes a sound like a cork being pulled from a wine bottle right as it stops turning over ........any ideas? ...it has fuel,spark, compression so I'm stumped on this one literally any ideas welcomed and appreciated Quote Link to comment Share on other sites More sharing options...
Bianco2564 Posted February 17, 2023 Share Posted February 17, 2023 Hello. Have you looked at a blocked exhaust? An engine needs fuel, ignition, compression and airflow to run. 1 Quote Link to comment Share on other sites More sharing options...
k3lv Posted February 17, 2023 Author Share Posted February 17, 2023 Hi thanks for the reply ,yeah I've had the exhaust off and ran wires down it , everything seems to be there it's just not going ...well it ran the other day for about 5 seconds then just died if I turn the idle adjuster all the way out I can hear it trying to run but just won't catch ...then the battery dies , it back fires through the carb aswell when trying to start . Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted February 17, 2023 Share Posted February 17, 2023 Have you checked the timing? Quote Link to comment Share on other sites More sharing options...
k3lv Posted February 19, 2023 Author Share Posted February 19, 2023 Hi ,yeah I stripped the top end down today timing is bang in and valves seem to be good , may have to order a leak down tester an see what that shows . This things got me puzzled Quote Link to comment Share on other sites More sharing options...
Solution k3lv Posted March 3, 2023 Author Solution Share Posted March 3, 2023 It lives ........after everything it turns out it was the bloody petrol , took out a mortgage an got a jerry can full of Morrisons finest premium fuel .....bike fired right up , used 2 full cans of E10 trying to get this bike to run an nothing 1st can was a couple of months old but the 2nd can was fresh that's when it tried to fire but just burbles an backfired so guessing it doesn't like E10 fuel .......thank god I never put the cheap stuff in the gsxr . Anyways thanks to all that replied an the suggestions greatly appreciated hope all are well and stay safe out there Quote Link to comment Share on other sites More sharing options...
manxie49 Posted March 3, 2023 Share Posted March 3, 2023 Glad you got it sorted. I must admit that I don't go anywhere near my bike with that shite unless absolutely necessary. Sometimes I have no option but always revert back to the super unleaded (E5) when I get chance. 2 Quote Link to comment Share on other sites More sharing options...
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