Hey guys I'm thinking about rebuilding my ex this winter and I was going to put a new piston in it and was wondering what is the highest compression I can get and still be able to run pump gas?
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Registered User
Hey guys I'm thinking about rebuilding my ex this winter and I was going to put a new piston in it and was wondering what is the highest compression I can get and still be able to run pump gas?
BBBRRRAAAPPP
11:1, 92 octane minimum.
If it's stupid, and it works, it isn't stupid. - Murphy's Law
2000 426EX,sold
2004 450R WIP
-Longtime A.A.D.S. (Accessory Acquisition Disorder Syndrome) sufferer.
400EX Frequently Asked Questions, CHECK HERE FIRST!
Banned
i know plenty of people do it, but i won't run anything less than 100 octane in my 11:1. the pumps around me have either 91 or 93. I have read many times that people are able to run premium with 11:1, but i just won't risk it.
Registered User
Long ago my 11:1 tried running on 93 octane and would still get a little ping, so I went to 100 aviation fuel, wasn't much differance in price. Later I would just add some turbo boost each fill up. Then later I started getting the 93 at a Sunoco station, the 2 strokers told me they really liked it. I have had no pinging or knocking last couple years.
1984 Honda 200M ATC
1985 Honda 200X ATC
1986 Honda 200X ATC
1999 Honda 406EX....11:1, Web Cam / Hardened rockers. Ported. WB CDI. CT Racing header. WB E-Series slip on. Lonestar swinger.
2001 Honda/KTM 520 Hybrid Quad. Its like a 400EX but twice the horsepower.
2014 Artic Cat Wildcat Trail XT
Registered User
thanks guys! if I put some octane boost in it will that be enough instead of having to buy race fuel?
BBBRRRAAAPPP
torco is the only octane boost that actually works.
I ran as well as my buddies 92 octane in our 400s for years, never an issue.
If it's stupid, and it works, it isn't stupid. - Murphy's Law
2000 426EX,sold
2004 450R WIP
-Longtime A.A.D.S. (Accessory Acquisition Disorder Syndrome) sufferer.
400EX Frequently Asked Questions, CHECK HERE FIRST!
Registered User
I've been running a JE 11:1 416cc for about 2 years now I guess. some times I've ran the cheapest thing at the pump (87) for just riding around the house. and 93 for when I go on longer riding trips. and for the few xc races I do I just got some 110 racing fuel at the station in town ($8/gal).
Pirate of the chesapeake
Yep I run 11-1 with a xr gasket, 93 all the time, never a issue.
440ex PPE Stg II headwork, Kibblewhite springs, Crf timing chain, stgIII H cam, Wiseco 11-1, GTT studs, Cometic gaskets, 450 carb, Sparks cdi, Oversize oil tank, LSR +1 stem, LSR +2 arms, , dura-blue X-33 axle, Dura-blue hub/fade/carrier, TAG, Hinson clutch/basket, HMF full pipe, ITP, ASM, IMS, DID X ring, UNI, UM, MAIER, Pro Armor skids, Stainless bolts, brake lines, 450r shocks, Sidwinder, Tusk, Wave.. A lil sprocket work,
Sit on my face B****
Have used 87-93 in my 11:1 and never had deto probs.
'02 Banshee
Registered User
ive ran 87 in my 11:1 440 never had any ping but now i run 92/100 mix
440, 11-1 comp, gt thunder headstuds, hd timing chain, hot cams stage 2, ported head, dg slip-on, jetted, 450r carb, k and n, +2 lonestar axle, 22s front, 20s rear
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