Might be a dumb question, but....

What octane should you use in a stock 06 SP700 twin...

flper

 

85 - 87 works just fine.

Mike

 

Thank you...

I did not know if I would benefit from the 93 or do harm.

flipper

 

I've always used 93 in my 04 500 sportsman ,runs like a clock.

 

Which octane to use depends solely on 2 things. First, and most importantly, is compression ratio. The higher the ratio, the higher the octane is needed. That's why the old muscle cars that ran 12:1 or more compression used 110 octane or greater. Higher oct needs to be compressed more to burn correctly. Likewise, lower oct need lower compression. Put low oct in a hi comp motor, and you get detonation (very bad), Put hi oct in a low comp motor and you get incomplete combustion and carbon build-up (also bad). Use the right oct as directed in your owners manual by the mfg'r.

Second is altitude. The higher you go, the thinner the air gets, resulting in a lower compression. That's why you see 83 and 85 oct in the mountains out west. You won't find anything less than 87 near the ocean (denser air).

 

use what the manual recommends. higher octane is a wast on stock engines.

 

like stated previously, useing high octane than is designed for hte motor will do the motor HARM. DONT USE IT

i think the 800 is the only sportsman that needs mid-grade

 

the 800 uses the same as the rest of them 87=(r+m/2)octane

 

hmm i thought i remember my 05's manual saying it needed 89

 

I'd just go with regular old 85-87 octane, thats what I run in my quads.