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View Full Version : Trans, primary, evo alignment ----- help



jmoney
06-11-2017, 7:43 PM
bought a couple basket cases and now trying to mix match to get something to whip

background
rigid frame
bottom breather evo
tp eng. trans
open 3" belt primary

primary doesn't seem to line up (vertically) with the engine

either the engine is too low

or

the trans is too high


trans plate is flat and mounts flush to the bottom of the trans case

no paint on the frame, no seatpost/trans clearance issue etc


the only way i can get good alignment is to prop the rear engine mount about 1/8" --- is this cool to shim just the rear of the engine??

does anyone offer a trans plate that is thinner or can lower the trans by X amount?




Thanks,
J

BadMonkeyMW
06-11-2017, 8:24 PM
It's not unusual to have to shim an engine sometimes, but what I'm wondering is what dimension you mean to say that it's out of alignment. If you mean that a line drawn horizontally between the sprocket shaft of the engine and the mainshaft of the tranny is not perfectly level, who cares? It won't affect anything. As long as the two components are aligned in the vertical plane, you're fine. I've seen many custom bikes where they raise the tranny way up in the frame to allow, say, a custom oil tank to be mounted underneath it.

I'm not sure you really have a problem, unless there's something I'm misunderstanding.

Sky
06-12-2017, 9:13 AM
if you need to shim the rear mount, torque down those rear bolts first and check the front mount clearance.
you might need to shim them as well.
also watch the rear rocker box to frame clearance...

jmoney
06-17-2017, 8:18 PM
thanks broseffi's for the feedback.... ill be shimming the back motor mount. GM Starter shims seem to work quite idea for rear (as well as the front and the tranny plate.

here is a picture of what i was trying to get at: 77473

Sky
06-18-2017, 4:02 AM
A straight line is a straight line.
Busted motormounts suck.
Think about moving the holes in the primary backing plate instead.
There are benefits to raising the trans. Ground clearance at the clutch basket and less sideload on thee mainshaft.

nmaineron
06-18-2017, 9:04 AM
The EVO trans plate is thinner than the shovel , I don't know if it lowers the tranny but by looking at it seems to lower the transmission.