banshee cheetah stroker help please

[erickzane]

I just built a 65mm 4mm stroker with vitos 4mm crank and wiseco standard pistons. how can I find out if I need a spacer or not? It does not seem to be hitting the top but I want to make sure before I start it. I would really appreciate he help thanks

[drag lt guy]

your gonna need either the head cut to accept the stroke or run the spacer.

[dajogejr]

Does it have standard or long rods? If standard (110mm) than you only need to get domes or the head cut for the additional 2mm (2mm at top and 2mm at bottom = 4mil stroker).
If it has long rods (115mm) than you need 795 series pistons AND a head or the domes cut.

Have you had the motor ported to match the 4 mil stroker crank you're about to put in? Port timings change when you add stroke, without matching the port timings, you're not going to get much out of that stroker crank...and to be honest, you'll be disappointed IMO...

[erickzane]

yes they are cheetah cubs ported for a 4 mil stroker with 110 mm rods. any recommendations on a good head with 4mm stroker domes?

[dajogejr]

nossmachine.com

Ok...help me understand. Are these a 4 mil casting, in other words were these cubs made for a 4 mil crank?
That makes a HUGE difference in how the domes are cut.

[erickzane]

yes from what I was told when I got them they are made for a 4 mil crank and would not work with a stock stroke crank?

[dajogejr]

Ok...you kinda left that part out...

Do you know how to squish test?

[dajogejr]

I was unaware of a 4 mil casting cub that used 65mm pistons. I thought any 4 mil was 68mm bore. can you double check your components, please??? Something is no right...

[erickzane]

yes I do know how to do a squish test. what would be the right measurement? how do check to make sure everything is right? the piston comes up even with the top of the jugs when its up and it lines up perfect with the bottom of the ports when its down. does that help any?

[dajogejr]

I like high .040 to low .050s for squish.
If it's a 4 mil cub casting, you probably have a number on the top of the piston that says 6800 in it....that's a 68mm piston. 573 series, I think is the blaster .080 over piston.