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Author Topic: What octane?  (Read 1763 times)

Offline Red89

What octane?
« on: December 05, 2017, 09:15:48 PM »
Hello all,
New member to the forum but not a first time R owner. I currently have a 89' with a CT310 head and a pro-x 27cc dome and 180lb of compression. My carb is either a 38 or 39, not sure which one. I am trying to find out what fuel to run. I was told 100 octane or mix of 93 and 110. I can get 91 here but not 93. Could I run 110 or do I need to do something else? Thank you all!

Offline The norm

Re: What octane?
« Reply #1 on: December 06, 2017, 12:07:26 AM »
With 180 psi I would run 92 octane non-ethanol. Good luck,  Loren
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Offline hickwheeler

Re: What octane?
« Reply #2 on: December 06, 2017, 01:48:48 AM »
I concur
88 hybrid 431 puma
88 (BOF Build) stock motor and oem 89 plastics
More in the works

 

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