Oil fouled spark plug

[MrBill]

Have 1999 Seadoo GTX RFI that is continuing to foul the rear (#2) plug, first every 6-8 hours of use, now after much less use. The front (#1) plug remains fine, but I continue to replace the other plug. Are there independent fuel/oil adjustments for each cylinder? Could one be running too rich? Also, I must confess...I have been using a Penzoil 100% synthetic, rather than the recommended Bombardier product. It was fine for many months, but maybe this is causing my problem? I would appreciate your comments...

 

[Jeff Walkowiak]

Re: Oil fouled spark plug

rear plug fouling is probably water getting in the combustion chamber, see what color the plug is and do a compression check see if the rear is lower than the front, sea doo engines will usually leak in the rear cyl, will need new o ring head gaskets if that is the case