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Author Topic: Lt250r pump gas or racing fuel??  (Read 1765 times)

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Lt250r pump gas or racing fuel??
« on: July 27, 2015, 09:17:45 pm »
Just had my engine built, head milled .30 , port and polished, 38mm carb, fmf pipes. Now i believe i had some detonation problems and was wondering if someone has a similier set up or knows if i should be running 110 octane or is 93 octane okay?
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Re: Lt250r pump gas or racing fuel??
« Reply #1 on: July 28, 2015, 07:05:51 am »
Quote from: 89LT250r on July 27, 2015, 09:17:45 pm
Just had my engine built, head milled .30 , port and polished, 38mm carb, fmf pipes. Now i believe i had some detonation problems and was wondering if someone has a similier set up or knows if i should be running 110 octane or is 93 octane okay?


Did you mill the head .3mm or .3in?
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Re: Lt250r pump gas or racing fuel??
« Reply #2 on: July 28, 2015, 07:37:42 am »
Mm
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Re: Lt250r pump gas or racing fuel??
« Reply #3 on: July 28, 2015, 07:41:14 am »
Well I had a guy do the work for me. Not 100 percent positive if it was mm or in.
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Re: Lt250r pump gas or racing fuel??
« Reply #4 on: July 28, 2015, 10:05:40 am »
The head was milled .03. Thirty thousandths
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Re: Lt250r pump gas or racing fuel??
« Reply #5 on: July 28, 2015, 03:23:32 pm »
Quote from: 89LT250r on July 28, 2015, 10:05:40 am
The head was milled .03. Thirty thousandths

What is your piston to head clearance (How much space is there between the piston and head when the piston is at top dead center)?
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Re: Lt250r pump gas or racing fuel??
« Reply #6 on: August 08, 2015, 07:23:07 pm »
I may be off but the PO of my 87 said he had some work done. I've never pulled the top end apart or checked head but I'm pushing about 185 psi compression.

I was told that I'm in the race gas game at that comp.

So that could be something to check and go by. But.... If I was misled. Then this isn't very good advice. Lol.
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Re: Lt250r pump gas or racing fuel??
« Reply #7 on: August 08, 2015, 10:01:24 pm »
I ran 110 in my 86' 25R.  I just had to change my jetting.  Racing fuel made my motor purr like a kitten.  Expensive but I could tell a difference in performance.
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1980  HONDA EXPRESS      NC50
1981  HONDA EXPRESS II   NA50
1985  SUZUKI LT250R        QUADRACER
1987  SUZUKI LT230EH      (WINTER PROJECT)
1987  SUZUKI LT230EH      (DONOR QUAD)
2013. HONDA TRX450ER     TRAILER QUEEN
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