switching to synthetic oils.

[atc250rer]

hello... i have finally rode about a tank and a half of fuel through my 1984 aircooled 330r ( yes i am using an trx 330r big bore piston by L.A. Sleeve) and i feel that it is pretty much broke in. I want to switch to synthetic amsoil interceptor oil... is there any jetting or other nonsence that i should consider befor changing to synthetic oil? :wondering

[TimSr]

Any time you switch your fuel mix you need to monitor the spark plug carefully and frequently for awhile. Sometimes it will require rejetting, usually just the main, sometimes its does not. The biggest factor is what oil and ratio you are switching from, and what you are switching to, and how much difference there is in their burning charactieristics.