2 down cylinders. 1260 big bore?

[1bad97]

well i had a sneaky suspition that i had a bad cylinder so i went ahead and checked all 4. 2 were good with 160psi and less than 10% for leak down and the other 2 were 140 and 20% or so for the leak down. now i think i might as well do the 1260 big bore. what do you guys think. and i might run NOS after to. and i am new to this site so just looking for some of youre thoughts. and its a 97 with 4-1 kerker stage 7 jets, under cut gears and lowered.

 

[VMAX1260]

my suggestion is to make it 1300cc which is the best setup for power and everyday use. i dont know if you will install forged pistons or oem yamaha's. i know yamaha makes 1260 kit for the v-max ,,it was my previous setup. if you install forged pistons and rods go to 1300cc.it is the same cost. You can talk to Sean which i am sure he will help you out since it is his job and we all know he does his job well.

 

[VMAX1260]

I just noticed that you are new member here. and if you get confused with the name Sean. I am talking about Sean Morley search this forum,find him and you can send him a private message.
welcome to our world.

 

[1bad97]

yea ive seen him on here or at least other people talking about him. i was just gonna do it my self because of the equipment i have available to me. but if i have trouble i will def get ahold of someone on here for help. thanks for the sugestion for the 1300 ill look into that to.

 

[sdt354]

Is a venture 1300 case a bored vmax? or is it cast thicker?
Thanks,
Steve-O

 

[one2dmax]

The bare block is bore larger then the sleeves installed. We can bore a stock vmax block 2.5mm with the stock sleeves (1275cc) though we usually just bore 2mm (1261cc). The Venture can be bored 1.5mm though we usually stay at 1mm.

I can assist with parts or just simple guidance. Whatever you need I am here to help.

We can even stroke the crank 2mm and reuse the stock pistons. This lets us get 12:1 compression and more cc's without even having to take the heads off!

Sean

Sean