Jetting for velocity stacks

[roosterds650]

Hey guys, I was told when adding velocity stacks on my stock 200 2.5 merc that I should go up two jet sizes. I pulled my stock jet and it is .068, so does that mean two sizes up would be .070 or .088 and do I have to change one jet on each side of each carb totaling six jets. Thanks

[us1]

Two sizes bigger is 72. If you are not removing an air box and installing the stacks the bigger jets are not necessary.

[Hot Shot Merc]

He is removing the air box and has the can removed from the mid section.Stack's alone dont meen you need to rejet but when the can is removed and holes drilled,shouldnt he rejet at that point????I removed the box on that motor with the can removed and holes drilled and the motor leaned and burnt a piston.All six plugs and piston tops where ash white.What do you think ?THANX,Rob

[us1]

Yes he should rejet if removing the air box and rejet even bigger if removing the can.

[mobiletech1985]

why are you removing the air box, your to stock for this, remmeber.

[roosterds650]

Im just thinking of things that I can do later to try an get near the Horse Power that your motor has. I can only hope. :D

[mobiletech1985]

thats a race boat, you have one seat, l have a family boat 4 seater. this next weekend is going to be fun. new place to go and new 28 chopper,speeds sould be good if the weather holds up.

[daytrader]

I removed the can and airbox and my plugs always look dark , also have 33cc heads. (2.4 175) Am i looking for trouble by not jetting up? Thanks, Gary

[us1]

I removed the can and airbox and my plugs always look dark , also have 33cc heads. (2.4 175) Am i looking for trouble by not jetting up? Thanks, Gary
You can not go by the plugs if you are running the stock center fire plugs. You must read the pistons.

[roosterds650]

Mobiletech We have the same seats by the way! But Im too stock for all your race mods. Ill get my speed from my set up. "you'll see"