gas mixture question on new motor question

[akevin]

just put my 96 superjet motor back topgether, its freshly ported and bored 2 over, factory b pipe, msd, milled head,stock carbs, what gas mixture should i use for the first tank and the rest of the tanks this summer, i was thinking 40:1 for the first 1 or 2 and then 50:1 after that, i guessing stock plugs should work best also?

 

[Cliff]

i run 40:1 all the time.

 

[Etheraldreamer]

as do i. 40:1 for the lifetime of the motor.

 

[Super Dee]

I would run it a little more rich in oil for the first two tanks. Probably about 32:1. Varrying the throttle while riding and no full throttle for the first two tanks. I'd also use a basic regular mineral oil and not a synthetic for the break in period. After the break in, switch to whatever type of oil you want.

 

[OCD Solutions]

X2 all of the above. Never use synthetic until a motor is well broken in!

 

[BombThreat]

why not use synthetic during breakin?

 

[tor*p*do]

why not use synthetic during breakin?

the boogy man will get you!

high end cars; caddys, porsches, BMWs now get synthetic in the crankcase from the factory.:fing02:

Run 25:1 for the first two tanks, vary throttle, swap plugs and then go 40:1

 

[Mouthfulloflake]

be careful with your jetting if you run richer than 50:1, if you are near the edge of lean, being 32:1 might cause you some deto, or tuning issue.

your fuel:air ratios is slightly different at different oil:fuel ratios.

edit:


also, with the milled head, large bore and porting, Id be looking for a girdled head pretty quick to be safe.