what is the best motor mount

[WaveDemon]

some of these shims ive seen stock are very thin,I bet many guys would get it just a tad off and jack up shafts,can someone mic the height of the gp mount vs the sj

are you suggesting that people use the same shims with new mounts? motors have to be reshimmed when motor mounts are changed. Thats no secret.

don't over think it. bigger softer mounts are better. add shims as needed.

 

[RoTAxGreNade]

I would pay more attention shimming the pump and intermediate shaft housing than the motor ~ ESPECIALLY for the blasters. Seems the coupler alignment is not as critical as the pump/ intermediate housing alignment is.
Stricky and a few others found out the hard way.
Just curious ~ Has anyone even stripped out a superjet shaft?

 

[masterblaster]

I have never reshimed a stock mount? just put them back in place. IO would think all the stock ones would mic out very close. how far off are you guys talkin on gp mounts? I agree though bigger softer does sound good........kinda like uhhhh

rotax..Ive only seen one sj shaft strip out,but tons of blasters even after they were reshimed.

 

[cambo au]

i am running legdrag/wammer mounts have had the same mounts in my boat for over a year and beleive me i have been coming up short on flips and rolls all year and have broken the nose of my ski twice and still no broken mounts
i can live with the extra vibrations if my mounts last that long

would definatly like to see a pic of the sj and gp mount side by side i was sure a thread started by superramjet stated that you needed to machine the bottom of the mount

 

[yamanube]

I will get side by side pics of the GP mount and SJ mount tonight (unless somebody beats me to it) I haven't measured them yet but I have heard you need to mill a bit off the base to lower them to the correct height in the SJ and have also heard people running them as is.

 

[Idok]

I would pay more attention shimming the pump and intermediate shaft housing than the motor ~ ESPECIALLY for the blasters. Seems the coupler alignment is not as critical as the pump/ intermediate housing alignment is.
Stricky and a few others found out the hard way.
Just curious ~ Has anyone even stripped out a superjet shaft?

blaster shafts are notorious for stripping....SJ's only if you dont align it right..

I think youre right dre..the key is more ini the PUMP vs. the motor....gotta shim the pump with no intd. shaft in the boat...then its easy, you can see the positionh of the shaft thru the bulkhead

I have never reshimed a stock mount? just put them back in place. IO would think all the stock ones would mic out very close. how far off are you guys talkin on gp mounts? I agree though bigger softer does sound good........kinda like uhhhh

rotax..Ive only seen one sj shaft strip out,but tons of blasters even after they were reshimed.

alignment shoud always be checked even if youre not changing mounts/bedplates.....just a good habit

 

[OCD Solutions]

Thanks for that last bit on alignment. I'm installing my pump and midshaft this weekend and was wondering about that.

 

[Matt_E]

some of these shims ive seen stock are very thin,I bet many guys would get it just a tad off and jack up shafts,can someone mic the height of the gp mount vs the sj

Shims come in different sizes.
If you run out of shims of appropriate size, you buy more and finish aligning the motor.
As others have pointed out, you should check alignment and re-shim as needed when changing motor mounts or cases/bedplates.

 

[tipafew]

I have been running Wammer mounts forever and have had some pretty bad rolls and come up short on quite a few backflips.

 

[masterblaster]

Shims come in different sizes.
If you run out of shims of appropriate size, you buy more and finish aligning the motor.
As others have pointed out, you should check alignment and re-shim as needed when changing motor mounts or cases/bedplates.

My point was what ever the factory uses to come up with the need for that thin of a shim, it must be pretty perfect.I dont see it getting reshimed to that level no matter how many more shims you add. also everyone is saying these gp mounts are higher,so if you use them front and rear,how is adding more height with a shim gonna help at all?

also I believe the true test for a mount starts at the one yr mark,most of ours last that long anyway,if your going to replace them at a yr for the heck of it,almost any will do

 

[WaveDemon]

My point was what ever the factory uses to come up with the need for that thin of a shim, it must be pretty perfect.I dont see it getting reshimed to that level no matter how many more shims you add. also everyone is saying these gp mounts are higher,so if you use them front and rear,how is adding more height with a shim gonna help at all?

also I believe the true test for a mount starts at the one yr mark,most of ours last that long anyway,if your going to replace them at a yr for the heck of it,almost any will do

I said it seemed the mount was a tad lower. I'm sure there is some variation in manufacturing.

I used a GP mounts for over a year before, just replaced them a few weeks ago and they wen't broken. I even had a heavy 66e motor in there for a while.

 

[masterblaster]

Tim.I know thats the strange part,everyone else is saying they are higher? Diff in manufacturing should be within 100s of a inch, wouldnt think that would matter.We shall see on the height when the pics are posted tonight. I gotta get my mounts ordered soon

 

[Matt_E]

My point was what ever the factory uses to come up with the need for that thin of a shim, it must be pretty perfect.I dont see it getting reshimed to that level no matter how many more shims you add. also everyone is saying these gp mounts are higher,so if you use them front and rear,how is adding more height with a shim gonna help at all?

also I believe the true test for a mount starts at the one yr mark,most of ours last that long anyway,if your going to replace them at a yr for the heck of it,almost any will do

My 01 RN came shimmed with some pretty thick ones.

 

[shawn_NJ]

Are these GP mounts? I am starting to kick around idea about which mount to run in the hull I am building. I have to ask Paul which he used here.

 

[dbrutherford]

Shawn I would almost say 1100 ZXi mounts. I have some from the 1100 I parted and they are much bigger than standard 650/750/800 Kaw mounts.


What's this shimming you Yamaha peopel speak of? Just kidding I couldn't resist being a kawie rider.


I am not a surf rider so that probably has way more to do with it. But I typically break mounts the most by removing the engine too many times. If the rubber doesn't break, the aluminum strips out. If the rubber breaks, looks for a bundle of joy in 9 months.

 

[RoTAxGreNade]

Demon hit it on the head... Manufacturing tolerances will be different.
The whole purpose of the coupler and donut is to factor misalignment to some degree along with settling of the mounts after being in service.
You hear alot of Sea dooers being anal about the alignment but if you look at how they manufacture the splined end of the shaft and the PTO fit, kinda like the latest socket extensions that Snap on tools make..... it will tolerate a bit of misalignment.
Mr Strick and Jason went thru a ton of new shafts and aligned only the motor - found the pump needed some ungodly amount of shims to center the hole up but after that all was good.
Epoxy on the splines work too !!! lol

 

[Idok]

ewok and I were trying to figure a way to drill and hole and pin them together....


here's a pic of modded keepers....these were to fit GP800/Raider mounts...

they definatly need to be cut....I tried a set of non modded KK's and they woudlnt fit..

 

[RoTAxGreNade]

You're gonna laugh but we actually DID epoxy one of Stricks shafts together.... The splines were very questionable so we degreased it and epoxied it knowing it could last 5 minutes.... Put it this way ~ the epoxy outlived his hull and we had to die grind the prop shaft when it came time to replace the hull.
I think it was 2-3 years ???

 

[Idok]

we will do that. guaranteed!

 

[The Penguin]

I would pay more attention shimming the pump and intermediate shaft housing than the motor ~ ESPECIALLY for the blasters. Seems the coupler alignment is not as critical as the pump/ intermediate housing alignment is.
Stricky and a few others found out the hard way.
Just curious ~ Has anyone even stripped out a superjet shaft?

yes. I'll post pics tonight.