paul910uk Posted May 29, 2007 Report Share Posted May 29, 2007 hi, I've just started riding trials. bought a '91 k roo fantic. it was a shed and should have spent my hard earned cash on somethin else i guess but been on it a few times and really enjoyed it. my problem is the tick over. i've adjusted the screws on the carb (ph8h26) works for a while then dies, however if i touch the choke only slightly the engine starts to rev really high. (this is when the engines warmed up) then works for about 10 secs then dies. anyone got any tips or is it a new carb? hope someone out there can help. cheers. p Quote Link to comment Share on other sites More sharing options...
mcman56 Posted May 30, 2007 Report Share Posted May 30, 2007 I don't know if this is your problem but I had an issue with a variable idle on a 90's Fantic. On that one, the slide was actually worn from vibrating around in the carb body. It was easy to see after pulling the slide up. For some reason it did not have any type of hard coating like most do. A new slide solved the issue. Quote Link to comment Share on other sites More sharing options...
grib Posted May 30, 2007 Report Share Posted May 30, 2007 Sounds like a blocked jet to me, have you stripped & cleaned the carb completely? Ask Bill Pye at Frankfield Fantic what the base setting for the idle mixture screw should be. Quote Link to comment Share on other sites More sharing options...
lee harris Posted May 31, 2007 Report Share Posted May 31, 2007 i could be that either the motor or the carb are both f<< Quote Link to comment Share on other sites More sharing options...
paul910uk Posted June 1, 2007 Author Report Share Posted June 1, 2007 thanks chaps. I've cleaned the carb, tick over is a bit better. Bill Pye is my next port of call. thanks again. P Quote Link to comment Share on other sites More sharing options...
paul910uk Posted June 1, 2007 Author Report Share Posted June 1, 2007 Wow, I'm very impressed with Bill Pye. He pointed me in the direction of the reed valve's. sure enough there was the tinyest of gaps where one of the valve's sat. bit of cleaning, turned it over and its working much better. I'm pretty sure there was some crap on the other valve so thats being cleaned after the weekend. He did say the valves are no longer available so it's been a bit of carefull work not to bugger them up. Still I can't recomend Bill enough. thanks to this site too. P Quote Link to comment Share on other sites More sharing options...
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