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I am completley rebuilding the z 400 i just got and I put the Wiesco high compression piston in. It is 13.5:1....... The little bit I got to ride it (now putting a better carb in it) after it warmed up sometimes when I turned the key off it kept running for a couple seconds.... I put 92 grade gas in it... I am assuming its detonating... I am going to put the carb in and re torque the bolts on the head and base. Then I will see if it keeps doing it. What do you think it will do ?
 

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92 octane is not enough for 13.5:1. You need to use race fuel for that, at least 100.
 

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Between the two Z's I have owned, one shut off when turning the key off instantly. The Z I currently own still fires a few times after turning the key off, and I don't think it is detonating, it just seems like there is a second or two of lag time which I know doesn't make sense. I wouldn't worry too much, this one I have has done it since it was brand new..
 

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you need to have a(preferably) 12.75:1 or less for pump gas. anything higher you need a 50/50 mix of pump gas and race gas or pump gas and octane booster or just simply race gas
 

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Go to your local small airport and get some 100LL aviation gas. It is WAY cheaper then race gas.
 

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Between the two Z's I have owned, one shut off when turning the key off instantly. The Z I currently own still fires a few times after turning the key off, and I don't think it is detonating, it just seems like there is a second or two of lag time which I know doesn't make sense. I wouldn't worry too much, this one I have has done it since it was brand new..
My Z does this sometimes too..
 

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Should be under 5 bucks....I don't know about your area but we have the highest gas prices in the nation.
 

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If you used a 3 layer your fine on pump, if it's a single, like said pump gas is not enough.
 

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Should be under 5 bucks....I don't know about your area but we have the highest gas prices in the nation.
Bet my gas prices are right there with yours.. I live in one of the top 3 highest tax paying counties in all of the U.S. lol I'd way rather live somewhere else like your area of Cali
 

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Bet my gas prices are right there with yours.. I live in one of the top 3 highest tax paying counties in all of the U.S. lol I'd way rather live somewhere else like your area of Cali
I live on one of the other three top tax counties lol, but at least you've got westchester airport right there!
 

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I live on one of the other three top tax counties lol, but at least you've got westchester airport right there!
ehh not really.. that's all the way over in white plains, it's a good 35 minute drive.. Westchester airport is like the size of a supermarket lol
 

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Wow thats it ??..... I'm assuming thats what you do with yours. Do you mix it ?
Nope, I don't need it. I just run 91 in all my toys.
I'm stock comp piston with a single layer base gasket, still in the 12's.

My buddy runs it in his Rhino that has a bit of work done to it.
I refer to it as the rescue Rhino.......when you have a VW sandrail you need one of those around.
 

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ehh not really.. that's all the way over in white plains, it's a good 35 minute drive.. Westchester airport is like the size of a supermarket lol
Perfect for getting aviation fuel. I may just go with that next time instead of CAMII
 

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It's better than $8+ a gallon for Cam II

Nevermind, at our airport 10ll is $7.36 a gallon. Not worth the 45 minute drive for me.
 

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last time I bough 100LL (about a month ago) it was $5.65 i think. Either way its way cheaper than race/premium mix and at 100 octane you end up the same as a 50/50 mix.
 

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It's better than $8+ a gallon for Cam II

Nevermind, at our airport 10ll is $7.36 a gallon. Not worth the 45 minute drive for me.
Where do they have CAMII? I know they usually have it at Sunoco stations but i've yet to see one in this area with race fuel...
 
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