Reply to thread

Message: [QUOTE="DLHamblin, post: 1190717, member: 61339"] Normally the jetting on the later YZ125's is pretty close. I am taking from your post that its only fouling when riding on tighter trails etc? Is the bike running OK before it fouls? (You mention a bog but am not sure you mean it bogging from being to rich or just not in the power band?) With a 125 it could be you aren't getting the plug hot enough to self clean itself when trail riding it as you aren't on the trottle as much and are at no throttle more than a track or open trails. I recall the YZ has a BR9EG stock; you may want to try a BR8EG (or BR8ES to save some $$) when trail riding; this can help the plug stay hot enough to clean itself. Then run the stock BR9EG when on more open tracks or trails. This assumes the jetting is on or close and that the problem isn't from a dirty or over oiled air filter. Once you have ruled these out; then try one step hotter on the plug to see if it helps the fouling. [/QUOTE]