Crank balance 3 cyl

[silver_notch138]

Hi all, I have 3cyl Yamaha 998 turbo snowmobile crank and assembly that needs balanced for cp pistons and rods.
Anyone have experience with these cranks? I’m curious on reciprocating %. That have a counter balance shaft in the engine as well.
Thanks

[Baprace]

Hi all, I have 3cyl Yamaha 998 turbo snowmobile crank and assembly that needs balanced for cp pistons and rods.
Anyone have experience with these cranks? I’m curious on reciprocating %. That have a counter balance shaft in the engine as well.
Thanks

Silver_notch138 , I have a Hines balance specification program and it specifies 3 cyl Yamaha engines to use 50% recip and 100% rotating values. There is no reference to balance shaft engines. Not sure if this number is still valid. PHONE: (734) 769-2300.

I don't have any experiance with balancing a ( Turbo assembly ) but I figure the piston weight may be lighter than the actual weight because of turbo/blower psi pressure on the piston, better call them and ask their recommendation with the turbo, please post their reply if you can.

[TSN]

I just balanced the same set up as you.
I used 50%

I had to add weight 15grams front and rear
Carrillo rods. CP pistons.
I didn't have the stock components to weigh

[silver_notch138]

Ok good to know. That the same components as this one. Unfortunately now that I’m into it my bob weights won’t go light enough to do it. I have a cwt machine.

[TSN]

I have a set of small narrow bob weights that worked

[TSN]

I have a smaller narrower set that worked on my machine.