how much does it cost to do a big bore???

[warrior87sambo]

hey guys, one of my customers is wanting to know how much it would cost to have his engine bored out larger. my question is, how much does it cost to have a machine shop do it to .40 over? thanks!

 

[lbjamm]

Depends on the shop and how far it needs bored.

 

[03yamwarrior]

The farthest you can go is a 366 I believe

 

[warrior87sambo]

im only going to go .40 over. and is there any head work that needs to be done to it after i bore it???

 

[Gen1Pat]

A 366 (85mm) is the biggest you can go without spending big bucks. The machine shop in town screwed me for $120 a year ago to bore my last engine's cylinder out .040", claiming it was because of all the time it took to set it up on the boring bar. In their defense, they did a great job, and only do automotive engines, but, I won't use them again because of price. Most all cycle shops or machinests charge between 50&80. 85mm piston/gasket kit will run ATLEAST $150 from what I've seen.

You can go to a 400 if you contact CWR. That kit requires their special piston, and the cases need to be bored. Their website has the case boring listed at $50. I forget what the piston and cylinder sleeving runs.

 

[03yamwarrior]

What do you mean by head work? P&p?

 

[lbjamm]

im only going to go .40 over. and is there any head work that needs to be done to it after i bore it???

Not related to the bore. Depends on if the head needs any work.

 

[warrior87sambo]

so if the head is good i dont have to have it machined so its bigger?? and yes i know, thats what she said

 

[03yamwarrior]

No you do not have to mess with the head

 

[03yamwarrior]

For the 400 kit gen1 was talking about its $375 for everything

 

[warrior87sambo]

ok thanks

 

[lbjamm]

so if the head is good i dont have to have it machined so its bigger?? and yes i know, thats what she said

correct

 

[beastlywarrior228]

Just like $60 for just shop work

 

['00 WO-YA!]

Yup, no major mods to go 1mm overbore. If you want a true big bore you'll have to talk to Greg at CWR

 

[redrum]

I just paid 70 for .20 over...and the weisco piston/rings was just about 150.

 

[Gen1Pat]

You could have gotten the piston for less on ebay. Around 105. Unless you got the piston with gasket kit.

 

[redrum]

yea just the 2 gaskets and like a o ring or 2 for the head. something like that...yea cheaper is better but it was kind of like a rush job. needed it done asap

 

[warrior87sambo]

lol on rockymountain its like 114 for the piston kit.

 

[warrior87sambo]

where did you get your gaskets?

 

[beastlywarrior228]

The wiseco for the motor I'm building for the new quad was 85