4 mill?

[chads300]

as my other post state my banshee is in need of a crank and top end ....... i was curious what all machine work has to be done for a four mill kit . and is it the better rout to go vs. stock rebuild

[toytech]

it is best to get porting done and domes cut for the 4 mill.  you can run a spacer under the cylinders but you won't gain much running that. a dune ported 4mil runs strong. well worth the $$

[chads300]

well my cylinders have some porting done not sure as to what they are setup for though.... 

[toytech]

they need to be ported for the 4 mil for it to run correctly

[trickedcarbine]

That looks like some decent work. Might have to have it speced by a builder to know what it really is. What do the transfers look like?

[chads300]

hmmm i am going to attempt to split the cases today so i will post up some pics and see what ya think. thanks for the help btw

[rjdgriff]

Get the cases port matched for 4 mil, I would go with a 4mil no doubt about it

[locogato11283]

For future builds, don't listen to anyone that even mentions a "spacer plate."

 

What kind of riding do you do?

 

What is your budget?

 

These are important questions.

[04_blu_shee]

X2 on the spacer plate... have it built right

[chads300]

loco most of my riding is done in strip mines and long loose hills,some trails but not all that much.... i really never liked the idea off the spacer plate and as of right now my budget is right around 1,300 until october i just want something reliable yet makes decent power...currently is .30 over,v force reeds the port job(which i will get better pics of later and post) fmfs(which are coming off) and a kn filter.

[chads300]

really my main concern was i really dont want to have the cases trenched.

[locogato11283]

You don't need case trenching for a 4mm motor.

[chads300]

i am going to attempt to do it on my own i think i will be alright long as i get a manuel... also any site sponcers sell a bottom end kit or do i have to buy the seals and such seperate?

[oldskool]

Your porting on the cylinders looks good, but they need some more work for the +4 crank. With the +4 mil, your piston crown is going to be 2mm lower at BDC, so you need the cylinders port timing change. Intake,exhaust,transfers. 

[Starwriter]

If the transfer ports are already raised a lot, porting them for a 4 mil is gonna be kinda iffy. Best to send the cylinders to a site sponsor and let them check the port timings and give you advice on how they'll work ported for a 4 mil. Then they can set you up with a crank, pistons, domes, seals, gaskets, etc.