New 310, what to do??

[ChvyCruzen]

I just bought a '88 R with the 310 non-pv big bore. I dont have it with me now, but I am wondering what should I be advised of?

This is my first big bore so I dont know what to do. I dont know how it runs either, I bought it on ebay.

Do all the 310's require race fuel? Will 93 octane plus a octane booster be sufficient?

Blacker - you have a 310 right? Is it pv or non-pv? How do you have it set up? What fuel do you run and where do you get it?

A few mods the R has are 38 A/S carb and FMF fatty. Will this set up work ok for trails?

not all 310s need race fuel, it just depends on your compression and your head...

[ChvyCruzen]

The guy I bought it from said it needs 110 octane. I haven't checked the compression, as I dont have the quad yet. It is a stock head, but I dont know if it has been milled.

[deathman53]

you can change the head gasket(if its a thin one) to a stock trx one, that will lower compression, or put in a 85 atc gasket which stock wa right at the line for race gas. Above 190lbs, you need race gas. upper 180-190 is the fine line.

[ChvyCruzen]

First thing I'll do when I get it is check the compression.

If its above 190 psi, and I dont have access to race gas - what is a good alternative?

[400EX QUADER]

I suppose AV gas.... some people like it, some don't. I say run 93 octane and make the compression about 175...

[kiesta00]

I use AV gas at 175 psi...probably useless but I find it burns cleaner. If your compression is too high and you don't feel like paying $7+ a gallon for C12, just get a trx head gasket to lower the compression. When I first got my bike it had 205 psi with the thin CR headgasket. I changed it to a trx head gasket and it went down to 160.

[ChvyCruzen]

What is AV gas?

[elbine69]

AV gas is aviation gas for planes. some people have had good luck with it. AV gas made my 310 run horribly so I run race gas

[sleepinR]

I run AV gas in my scrambler and my dad runs it in his harley...not sure the compression on each but i know they run a lot better with it than regular '93...each have had a good bit of mods done and need a higher octane but i live right next to the county airport and for 3.50 a gallon its nice...never had any problems with it and its a nice octane right in between premium with octane booster and race fuel if you dont' have too high of a compression

[C-LEIGH RACING]

AV gas is straight gas, no additives mixxed in, air craft dont need additives in the fuel like a land based engine needs.
Your dads Harley might be ok & then maybe not.
Land based engines need additives in the fuel to support the valve train like lubes to lube the stems & guides & stuff to cushion the valves when seating aginst the seats.
Neil

[400EX QUADER]

also av gas has addivitaves in it so it doesn't freeze at the high altitudes...

[300excrazy98]

You could trade / sell your top end you have on there now. If you do, i might be interested in buying it/ trading for it. i have a stock cylinder bored 0.040 over, duncan port and polish

[ChvyCruzen]

I may consider selling my top end. It depends...