What kind of oil to use in Honda TRX 400

Hey i just recently bought a 2001 Honda 400 ex with Wiseco Pistons and Titanium Valves in it and Im wondering what type of oil should i run in it??? And also with the Wiseco Pistons and titanium valves in it would i be able to run 87 octane in my 4-wheeler? Or should i run 92 Octane???
Thanks for all your help

[Sword_of_Spirit]

Depending on where you are running (summer for most of us), I would put a full synthetic 10W-40 or 15W-40 oil in it. This will keep the oil flowing real well and protect the internals also. Castrol and Shell (Rotela T) are excellent choices. 92 octane should do well with the 11.1 high-comp piston. I would spend the extra money on the "race" fuel or octane boosters. As long as it is not pinging, you could even go a few points lower (providing the gas in your area is of good qaulity). Hope this should help.

[Sword_of_Spirit]

Depending on where you are running (summer for most of us), I would put a full synthetic 10W-40 or 15W-40 oil in it. This will keep the oil flowing real well and protect the internals also. Castrol and Shell (Rotela T) are excellent choices. 92 octane should do well with the 11.1 high-comp piston. I would spend the extra money on the "race" fuel or octane boosters. As long as it is not pinging, you could even go a few points lower (providing the gas in your area is of good qaulity). Hope this should help.

Indent: I would NOT spend the extra money on "fuel" or octane boosters.

[03warrior]

If you go with a full syn. go with amsoil formula 4 stroke 0w-40. It will offer the best protection for your money. Very high resistance to heat and cold temps. you can get it at this website AMSOIL Online Store - Synthetic Oil, Lubricants, Air Filters, Oil Filters Gear Oil