pugslee Posted September 19, 2011 Report Share Posted September 19, 2011 Hi Guys Can anyone help or advise with my non running sherpa 350 199***** It used to start up 4/5 kick and run ok. I was out on it at the weekend and it started to run rougth. I thought it was running out of petrol so went for res but made no diffrence. It then would not tick over and stalled three times on the way home finally giving up all together, and had to be recovered. I thought it felt like fuel starvation so stripped the carb,cleaned it and blew out with air compressor and re built. Still wont fire, tried bumping down hill and still wont go. New plug with a nice bright white spark but no joy. Have re stripped carb fitted with new slide as there was a very small piece missing from bottom, new needle main jet and mixture screw. The plug looks wet when removed. had exhaust off and looked in port. Rings and bore look good almost new looking, has good compression. Any ideas as i am at the end of my tether and bloody fed up with kicking the cow over. Quote Link to comment Share on other sites More sharing options...
feetupfun Posted September 19, 2011 Report Share Posted September 19, 2011 Possible sheared magneto flywheel key Quote Link to comment Share on other sites More sharing options...
1oldbanjo Posted September 19, 2011 Report Share Posted September 19, 2011 Have you checked to see if you are getting any fuel flow from the tank? Quote Link to comment Share on other sites More sharing options...
nitsua Posted September 19, 2011 Report Share Posted September 19, 2011 Hi Guys Can anyone help or advise with my non running sherpa 350 199***** It used to start up 4/5 kick and run ok. I was out on it at the weekend and it started to run rougth. I thought it was running out of petrol so went for res but made no diffrence. It then would not tick over and stalled three times on the way home finally giving up all together, and had to be recovered. I thought it felt like fuel starvation so stripped the carb,cleaned it and blew out with air compressor and re built. Still wont fire, tried bumping down hill and still wont go. New plug with a nice bright white spark but no joy. Have re stripped carb fitted with new slide as there was a very small piece missing from bottom, new needle main jet and mixture screw. The plug looks wet when removed. had exhaust off and looked in port. Rings and bore look good almost new looking, has good compression. Any ideas as i am at the end of my tether and bloody fed up with kicking the cow over. try a new condenser. Quote Link to comment Share on other sites More sharing options...
bondy Posted September 19, 2011 Report Share Posted September 19, 2011 Hi Guys Can anyone help or advise with my non running sherpa 350 199***** It used to start up 4/5 kick and run ok. I was out on it at the weekend and it started to run rougth. I thought it was running out of petrol so went for res but made no diffrence. It then would not tick over and stalled three times on the way home finally giving up all together, and had to be recovered. I thought it felt like fuel starvation so stripped the carb,cleaned it and blew out with air compressor and re built. Still wont fire, tried bumping down hill and still wont go. New plug with a nice bright white spark but no joy. Have re stripped carb fitted with new slide as there was a very small piece missing from bottom, new needle main jet and mixture screw. The plug looks wet when removed. had exhaust off and looked in port. Rings and bore look good almost new looking, has good compression. Any ideas hi may be suking air in somewhere have you checked your inlet rubbers? or it could be your cranck seals need changing. this happened to me. but befor looking at your seals try. and eliminate the obvious like mentioned the condeser fuel is your plug oiled up? if so clean it hope this helps Quote Link to comment Share on other sites More sharing options...
charliechitlins Posted September 19, 2011 Report Share Posted September 19, 2011 Bright white spark is no good. Fat and blue is good. Quote Link to comment Share on other sites More sharing options...
zoolord Posted September 20, 2011 Report Share Posted September 20, 2011 (edited) If the plug is dry, it's normaly the carb. But in your case you say the plug is wet. and you have a spark. could be firing in the wrong place. on the older bikes that had a keyway. if that broke the timing would go out Edited September 20, 2011 by zoolord Quote Link to comment Share on other sites More sharing options...
pugslee Posted September 22, 2011 Author Report Share Posted September 22, 2011 Hi Guys Thanks for respone I have had the flywheel off and the keyway and key are fine, I have put in a new condensor just because i had the flywheel off but the old one has only been in 3 months.I have re set timing and points gap to top dead centre.I have checked inlet rubber this looks good (no holes or splits). I have removed the bowl and its full of fuel so thats getting in as the plugs wet. Its been mentioned that the crank seals could be worn and letting in air. Would this cause a non runner or just bad running. Cheers for all the help. Quote Link to comment Share on other sites More sharing options...
zoolord Posted September 22, 2011 Report Share Posted September 22, 2011 just a quick q.. if you put petrol down the plug hole does it fire up.. Quote Link to comment Share on other sites More sharing options...
swooshdave Posted September 23, 2011 Report Share Posted September 23, 2011 My first rule is that if you don't know when the crank seals were changed, change them. They can cause all kinds of problems. Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted September 23, 2011 Report Share Posted September 23, 2011 points flat and shiny? new plug? Quote Link to comment Share on other sites More sharing options...
smelling123 Posted September 24, 2011 Report Share Posted September 24, 2011 How old is the fuel? Some of the stuff on sale now seems to go off very quickly..... Quote Link to comment Share on other sites More sharing options...
bullylover Posted September 25, 2011 Report Share Posted September 25, 2011 (edited) Hello to all. You said you reset timing to top dead centre. the timing on a 199 is specified in the handbook as 2.8 to 3.0 before top dead centre going off my memory but it is up to you to have where you like it. if the points were opening on TDC it would not run. Just a thought. I like it at 2.8 before TDC. Plug gap should also be at .40mm same as the points. Bully Lover. Edited September 25, 2011 by bullylover Quote Link to comment Share on other sites More sharing options...
pugslee Posted September 27, 2011 Author Report Share Posted September 27, 2011 Hi to all Just to let you know i have re built the bike and it started first kick. I cant tell you what it was because i have done that many diffrent things to it in the last two weeks it could have been any of them. But its now a runner, and starts runs and ticks over better than before. A very big thanks to all who responded with helpfull tips. Its this kind of help that makes Trials Central the place to be. Cheers Quote Link to comment Share on other sites More sharing options...
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