701 motor mount mod

[Waternut]

I know the Kenny Keepers were made since SJ motor mounts are apparently prone to breaking. However, since these keepers are only designed to prevent the engine from rocking forward and ripping apart motor mounts, it would seem that something else could be done.

I know people have tried this temporarily but not enough people have done it permanently to verify results. What if you were to thread a bolt all the way through a motor mount. Put a bolt, washer, and maybe some urethane or hard rubber on the underside of the mount and just a nut and washer on the top side. This way the motor mount couldn't fail even if the ski landed upside down.

I see a few issues with this though... First is getting the eninge in the hull. I would imagine you'd have to install the engine in the hull with motor mounts attached already so you could slide the couplers together. Second issue is vibration. Originally the motor is isolated from the hull with rubber. Would the bolt squeezing the motor mount cause a lot of vibration problems? The last issue is the hull attach bolts. The chance a motor mount will rip itself out of the hull. A lot of people are concerned with this but I feel this is the least of the worries. Although a valid concern, I feel that if you have enough force to rip motor mounts out of the hull, you had enough force to rip a normal motor mount apart and cause plenty of other damage first.

Let me know what you guys think....

 

[McDog]

kenney keepers are easier:bananapowerslide:

 

[Boris]

kenney keepers are easier:bananapowerslide:

Yea, but they don't do what is talked about here.


I was actually thinking of running straps over the bed plates.
Same idea but less vibration transfer.

 

[WAB]

Not trying to piss any anyones cereal. But....
What would you rather replace, a ripped out motor mount or a motor mount's ripped out threaded brass insert in the hull? That's the next thing to go if the rubber mount cannot absorb the force

 

[Kennay]

Not trying to piss any anyones cereal. But....
What would you rather replace, a ripped out motor mount or a motor mount's ripped out threaded brass insert in the hull? That's the next thing to go if the rubber mount cannot absorb the force

Ding ding ding! Winner!

 

[McDog]

kenney keepers are easier:bananapowerslide:

I stand by my original post!

 

[Idok]

we ran a thru bolted motor mount a few weeks ago....did an on beach motor moutn replacement and the modded one held up great for a few rides...

then took it out nd replaced with GP800 mounts..


if you are weary about SJ mounts you should try switching to GP800 or waveraider mounts..

 

[Freakrider]

we ran a thru bolted motor mount a few weeks ago....did an on beach motor moutn replacement and the modded one held up great for a few rides...

then took it out nd replaced with GP800 mounts..


if you are weary about SJ mounts you should try switching to GP800 or waveraider mounts..

I am running two XL 700 mounts in the rear,they seem stronger (larger diameter plate ) they might be like the GP 800's and two SJ mounts in the front with kenney keepers...

 

[Waternut]

I know I've got a mental breakdown on the issue but here are my thoughts... I could spend $85 on a set of kenny keepers that will only keep the mounts safe in a 'nose-in' condition (and I still may). But to me, this just seems like buying a new car you plan to drive aggresively and getting comprehensive insurance but not collision... One is better than nothing, but you're not fully covered. That's the reason I'm looking into the issue...

 

[Matt_E]

See post #4.

Something will break. What do you want that something to be?

 

[Waternut]

See post #4.

Something will break. What do you want that something to be?

Don't get me wrong...I'm not saying this idea is better in any way. If I believed this idea was far superior, I wouldn't have asked and it'd already be in my ski.
However, Kenny keepers don't magically absord the load. They just transfer the load from the motor mount itself to the bolts in the hull. When the kenny keepers do they're job of preventing the engine from moving forward/rotating down, they rip up on the bolts mounted to the hull. Only they rip up using a lever (the inboard point where the engine hits the keeper) making the force even greater on the rear bolts of the fwd mounts.

 

[McDog]

They keep the mounts from getting torque applied in the front to back direction. Every other direction is accounted for by the placement of the mounts and the coupler.