I've got a 04 yz125 that started fouling plugs when I took it out of storage last year, was a little buggy too. I re jetted it and that helped the bog problem and the black crud from the exhaust, carbon looks new inside still, has low time on the top end, cleaned the filter on it, cleaned the exhaust valves, reeds are all good, and exhaust wasn't plugged, running klots 40:1 with 91-93 octane(highest they have at the station I'm at) foul plugs in under half hour most time(not putting on it)
fouling plugs need help
- Thread starter rob435
- Start date
seals
Check your trans oil,, if it's low then I suspect you may have bad seals... Lost the seals on a cr 125 due to a clogged air filter which then had to pull air from some where so the mag side seal went and every time I rode it after a rebuild it would either burn a hole in the piston or foul a plug. which meant that both seals were gone.
Check your trans oil,, if it's low then I suspect you may have bad seals... Lost the seals on a cr 125 due to a clogged air filter which then had to pull air from some where so the mag side seal went and every time I rode it after a rebuild it would either burn a hole in the piston or foul a plug. which meant that both seals were gone.
clean the carb?? run some sea foam through it.. if it ran good before it went away, just betting something is plugged and dumping fuel in.
