evo in 4speed frame question

[skincat]

just a simple question. i searched for it but could not find. so here it is. what does it take to put an Evo motor in a 4 speed shovel frame? any help would be appreciated.

[victm]

From what I have seen, notch seat tube for rear head/valve cover clearance, raise top tube as evo engine is 1" taller, I believe (I am sure I will be corrected if I wrong).

[BadMonkeyMW]

Originally Posted by victm

From what I have seen, notch seat tube for rear head/valve cover clearance, raise top tube as evo engine is 1" taller, I believe (I am sure I will be corrected if I wrong).

That sounds like the basic procedure. The frame definitely has to be modified to take the taller engine.

[geasy$]

Originally Posted by victm

From what I have seen, notch seat tube for rear head/valve cover clearance, raise top tube as evo engine is 1" taller, I believe (I am sure I will be corrected if I wrong).

thats about right. I had an evo stuffed in an old 4 speed frame. the problem is the clearance on the back jug...........

[Danny F.]

The center post has to be notched yes, but to fit the taller evo under the seat post triangle so to speek it's enough that you grind the bottom of that area flat end reweld it shut...of course this way the evo will fit, but if you ever have to take your rear valve cover off...
I did it a couple times with this method because I like the lower seat height on rigid pan-shovel frame against custom rigid evo frames...
These 2 bikes got repop pan-shovel frames wich I modified to accept the evo...

[Cromagnum]

Is it easier to lower engine mounts? or does that mean tranny mounts need to be lowered too/ What if your runnin an open Primary?

[chicoman7]

I ran an evo in an old rigid santee frame with a open primary. Just had to notch the down tube and take a little meat out of the backbone and use a shoe horn.

Originally Posted by Cromagnum

Is it easier to lower engine mounts? or does that mean tranny mounts need to be lowered too/ What if your runnin an open Primary?