My piston is a JE. It was made for me leaving a little more on top than the normal 12:1.

 

Try ULIMATE 4 by VP

 

VP red is what i like..Ult 4 would be great and but to low of octane 94...

I might try the c12

 

I am running it with a 12:1 je with no problems. With the correct additives and jetting the octane does not need to be a s high and the engine will run cooler. Call vp for more info.

 

Nice signature TriRap. LOL

I know of one other OVER 12/1 686 that uses, or at least used, Ultimate 4 once. It ran like a champ that day. I never did hear of him having any poblems with the low octane, but he didn't run it too long after that.

The 13/1 I was talking about was made by DASA, I think. It is on Alba web site wahtever the name is.
The thing that bothers me is it say shipping weight for this piston is 5LBS!!!![img]i/expressions/face-icon-small-shocked.gif[/img]
piston


jcd, who made you 13/1 JE?

 

Ultimate-4 92 octane; Ultimate-2 100.2 octane

Do the math!!

 

c-12

 

Ultimate 2 is for 2 strokes it will gum up your intake valves in a 4 stoke![img]i/expressions/face-icon-small-confused.gif[/img][img]i/expressions/face-icon-small-smile.gif[/img]


Ward660R, I can't give all the details to keep it interesting![img]i/expressions/face-icon-small-wink.gif[/img]

 

TriRap, I don't know where or who you talked to, but there is know difference between the two other than the octane rating. I talked to Brad at VP Racing in San Antonio home office for VP Fuels.

He also told me that a single cylinder four stroke up to 13.1 compression could run Ultimate 4 just fine with no problems, I have the same set up and I have had no problems.

I will be purchasing Ultimate 2 and trying it out for myself.

 

STRAIGHT FROM VP"S WEB SITE!!!!!!!!!!


NEW! ULTIMATE 2
Designed for ultimate performance in stock and modified 2-stroke motorcycles. Generates up to 6% more horsepower than pump gas over the whole RPM range! Makes 2-stroke engines faster and more responsive without harming the carburetor, O-rings or gaskets as some competitors' race fuels will.

• Color: Clear
• Leaded
• Motor Octane: 100.9
• Specific Gravity: .717 at 60° F


ULTIMATE 4
Designed for ultimate performance in 4-stroke motorcycles. Generates up to 6% more horsepower than pump gas. Makes 4-stroke engine faster and more responsive without harming the carburetor, O-rings or gaskets as some competitors' race fuels will. Can also be used in stock 2-strokes with the same impressive results.

• Color: Clear
• Leaded
• Motor Octane: 92.2
• Specific Gravity: .718 at 60° F


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