detonation

my stock oo 426 seems lean and pings in the midrange with engine cold or temps below 70. has anybody tried raising the needle, all other jetting areas seem ok. I have had no plug fouling, unless I leave the damn rubber exhaust plug in and try to start it.

Originally posted by mike dean:

my stock oo 426 seems lean and pings in the midrange with engine cold or temps below 70. has anybody tried raising the needle, all other jetting areas seem ok. I have had no plug fouling, unless I leave the damn rubber exhaust plug in and try to start it.

Did you happen to replace the pilot jet with 45 or 48 ! I was told that the bikes were shipped into the country with lean pilot jets (42)s . So if yours is a 42 try putiing a 45 for summer riding and 48-50 for winter riding!

thanks for the tip I will check it out.

check for air leaks around the inlet area or on the carb etc.

Taffy

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