Posted July 27, 2011 - 09:51 PM
I have been through the carby very thoroughly at least three times and i know carbs fairly well so unless there is something particularly obscure that i could have missed i can't see there being any other issues with the carby. the plug is black and sooty every time i check it but no amount of leaning the mixture is stopping my problems.
I got hold of a CDI unit from an 03 WR450 which i could try but i am wondering if it compatible. i can't afford fry this CDI. I also have a the carb from the 450 which i could try but yhis would requite quite a bit of fiddling to make it work.
Does this sound to you like an ignition problem and can i try the other CDI? or if it doesn't where should i go next.
P.S valve clearances are within spec and everything's fine under the tappet cover.
Posted July 28, 2011 - 12:24 AM
Posted July 28, 2011 - 01:47 AM
1. Idle. Sounds like a blocked pilot jet and/or passage.
2. Have you tried it with the TPS unplugged?
3. Throttle plate installed correctly? No cracks?
4. Worn emulsion tube.
Posted July 28, 2011 - 04:31 AM
I am now sure that it is a carby problem because i put a carb from an 03 450 in it and my problems have disappeared. i am thinking about ordering a full rebuild kit for the FCR and replacing all the
o-rings seals and gaskets and seeing if that sorts it out.
does anyone know a way that i can test the TPS? i have heard that it is difficult to reset them on to the throttle shaft. if anyone can shed some light on this it would be much appreciated.
Posted July 28, 2011 - 06:07 AM
Posted July 28, 2011 - 09:59 AM
Posted July 30, 2011 - 10:28 PM
the bike is running great with my friends carby in it. now i just need to figure out what is up with my carb so i can give his back. i am checked and cleaned pretty much everything in there very thoroughly and the only thing i am wondering about is could it be the TPS causing my troubles. is there a way i can test my TPS, and how easy is it to swap them. i hear there is some tricky aligning to be done when replacing them.
Posted July 31, 2011 - 12:39 AM
However, with the TPS disconnected the bike should revert back to a base or an RPM map. In this mode, it should run OK, but with less power.