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I have a 2004 Cagiva Raptor 125 (2stroke...) I had the engine rebuilt last summer: New piston, new rings, new gaskets, the cylinder was ( i don t know the correct therm) corrected: they added some cast iron on the wall ( it had low compression at wouldn t start). I used only high quality Motul 710 oil.

I did about 2000km last year and i kept it all winter in my heated garage (>10 degrees Celsius), Then it started acting weird: Yesterday i rode it for about 30km. It started normally: i used a bit of choke as it was a cold morning. It ran just fine, i let it rest for 6 hours and then it had a bit of difficulty firing up, but eventually some choke helped it. I rode it for about 3 km, then i let it rest for about 1 hour. I decided to try firing it up to see if it is all ok. It fired up right away, no choke needed. I had something to do for about 30 minutes and then i tried to start it and it wouldn t fire up. I tried some choke, it wouldn t help it. I tried to push start it, it kept stalling, like the engine had very very low compression. Finally... i let it there and thought of another way to go home so i stayed at a friend for 2 hours. I came back to it, tried to start it and it fired up right away, no choke needed, no nothing. I rode it back home (30km) with no problems at all... What could be the problem? I m thinking maybe the carburettor needs some adjusting, but i am not sure.

P.S: excuse my bad english.

  • Is it still filled with the fuel from before winter? – Steve Matthews Apr 4 '17 at 10:47
  • I filled the tank up on the 16th of December ( when i last rode it). Then i started it once and let it run for 10-15 minutes every week. – Andrei Grigore Apr 4 '17 at 11:21
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    Drain the old fuel and put fresh in. Sounds like there may be some moisture in the fuel or stale gasoline. – CharlieRB Apr 4 '17 at 11:39
  • My thoughts exactly. Old fuel, especially modern blends, doesn't age well at all. – Steve Matthews Apr 4 '17 at 12:29

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