366 kit

[Dballard87]

Do you have to run higher octane fuel with a 366 big bore kit also how does purchasing a big bore kit work o they send you a cylinder and a piston or just the piston and you get the cylinder bored?

 

[derheim]

I got a 10.5:1 and it says 91octane. 12:1 is 93 I think. They send you a piston you need to get cyl. bored and honed.

 

[Dballard87]

What does it need to be bored to?
And can I just run regular pump gas through it or would it hurt it?

 

[alex456123]

366 is not a big bore kit. It's just the stock cylinder at max bore.

 

[derheim]

You send the piston with the cyl. As far as gas I would run what they recommend. But that's me.

 

[Dballard87]

If I buy a big bore kit do I have to run higher octane with it the reason I'm asking is because running high octane fuel is pretty much out of the question for me.

 

['00 WO-YA!]

Then leave it alone.

 

[Dballard87]

What about a .020 over bore how much extra performance would That give me? Would it make a big difference

 

[Warriorfreak99]

i've got a 0.040 over kit and I didn't notice any difference at all over stock, and octane isn't determined by the size of the bore it's determined by compression, you can run pump gas up to about 11:1 compression, I've always ran 93 octane in everything I have just as a rule of thumb because it burns better and increases efficiency reduces stress on engine components etc. If you buy the 366 kit its offered in 2 compressions, 10.5:1 (You can still run pump gas) and 12:1 (High octane race fuel or at least a mixture of high octane and 93) check out your local auto machine shops and they'll walk you through everything needed, my local shop charged $35 to bore and hone my cylinder to match my new piston and rings kit. You will have to change your carb jetting too because you have more displacement, therefore you'll need more fuel. I've heard some say you don't need to change jetting but I don't see how that's possible

 

[Warriorfreak99]

a thicker base gasket or even 2 base gaskets in between your cylinder and block will reduce compression also

 

[Dballard87]

Hey thanks man that is really really helpful. I think I'm going to go with the 366 kit then with the lower compression

 

[Warriorfreak99]

call JE pistons and ask for a starting point on your jetting is so you dont fry a fresh piston

 

[Warriorfreak99]

the 366 kit is a good starting point to wake your motor up...with the right cam and carb the bike will be nasty

 

[Dballard87]

I'm gonna try for a z-400 carb and a stage 1 hotcam I would get the web but I can't have the down time to send my cam off they sell a 366 jet kit on ebay too