I just finished rebuilding my 96 Yz 250... ran great before I took it apart! Dont know if it matters or not but the bike has the long rod kit installed that was very popular in that era. Had the PV matched to the exhaust port and now the bike falls on its face when the PV should open like its not operating properly but it is operating correctly but I get nothing when I get to about 1/2 - 2/3 throttle it just cuts out... BAD! Ive been though the carb a million times already, installed a rebuild kit, new clean jets, and checked the float level over and over again to no avail and theres no way that jetting that was once good just suddenly went bad. So I bought a JD kit and installed it with the same issues, contacted him with the problem and he said that with the jetting recommendations that he gave there is no way the bike would run that poorly and insists that it is not a carb issue. His recommendation was 175 main, red needle 3rd clip pos, 42 pilot. What do you guys make of this?
Here is a vid of what the bike is doing. Throttle is being held wide open in both vids.
Its 10x worse under load. Ive done a leak down and compression test and both are great. Tested resistance in all electrical components and all tested within spec when cold obviously with the exception of the CDI. Not sure what else to look towards before I just start blowing money and replacing the electronics piece by piece until I find the problem. Ive already tried a different coil as well. Cleaned all grounding elements and made sure there was a good metal to metal surface. I hate to repeat threads but Im VERY desperate at this point since I have a riding trip scheduled for SC on the 15th of April. Ive been through this bike so many times it makes me sick!
Thanks for any possible advice, Brian
Edited by BDubb106, 27 March 2012 - 04:27 AM.