Engine vibration after crank replacement...

I've just replaced my crank with an SBT crank and I'm getting engine vibration throughout, but more noticeably in the mid range.

What are common screwups made when replacing cranks?

Compression tested fine, but I'm at the beach without tester so can't recheck until I get home.

I've gone though a tank of gas, seems to load up a bit which it didn't before crank replacement but I'm guessing vibration will cause this. Revs out OK in top end.

Cheers,
Dax

This is probably a long shot, but what engine mounts are you using?

Was using all stock 701 mounts, were OK when I put em back in but one must have been on its last legs as it blew apart not long after the first ride. Replaced it with a monkey grip mount.

Did you do an alignment measurement after you put in the monkey grip mount?

No, I didn't (not enough tools with me at the moment) but the mount is the same dimensions as the OEM mounts.

Would the alignment being slightly out make it vibrate a lot? I'm sure the alignment has been a lot more out than it is now without this level of vibration.

I'm heading home tomorrow, so will be able to check when I get back.

Alignment will be out and monkey grip mounts are very hard so will transfer more vibrations

Hey Dax how's things been?
As above work on Alignment of motor first but also check the gap between couplers.
I once had mine to close and it made a bad vibration...about 5mm is pretty good.

Good mate, haven't been riding much recently but now I've replaced the crank I'm hoping to get out more often. I'll check things when I get back to Hamilton and report back. It does have a big washer behind the coupler to make it closer, so you could be right.

also remember to check that the B-pipe chamber is not hitting the top of the engine plate, and that the engine keepers are not hitting anything underneath the engine, use a little mirror to inspect.

It appears the monkey grip mounts made a .5mm difference and did slightly put the alignment out. Also, there is a 4mm gap between couplers....so I'm in the process of pulling the engine out to remove the washer behind the coupler. Will let you know how it goes...

If you take the washer out the gap will get bigger 4-5 mm sounds pretty good Dax

Yeah, I found that out before I pulled the engine. There was enough play in there, so now its exactly 5mm. With the shims I have the coupler is within a tolerance of .25mm using feeler a gauge all around. I'm sure that's more than close enough? I read on x-h2o forums they use a card to visually check its level. I added another monkey grip mount to the opposite side of the one that I had already replaced too, so any difference in the mounts will now be balanced. Lets hope its sorted now, it runs fine on the trolley but wont really know until its in the water.

Thanks for all the advice!