GPRXP Midshaft bracket

[Hydrotoys]

Goal: Provide a water feedthru for the driveshaft.

Parts:

• Modified GPRXP midshaft.
• 1/8" aluminum L-bracket.
• GPR bearing feedthru.
• Hose adaptor for bracket.

Assembly:

• Press the modified midshaft into the GPR bearing assembly all the way to the wrench cut-outs on the shaft.
• If you test fit this assembly in the ski, it should be just clear of the intake grate shelf by at least 1/8".
• Weld, or bolt the hose adaptor onto the L-bracket.
• Bolt the bearing feedthru/midshaft assembly onto the L-bracket.
• Run a grease fitting to the assembly.
• Let dry and install during engine placement.

[Hydrotoys]

Prepping the hull to accept the bracket.

• Use a torch, and heat up the epoxy, till it turns a black crusty color. DO NOT LEAVE IT ALONE... Avoid the VAPORS. Deadly.
• Peal off the burnt epoxy.
• Sand the octogon inserts flat.

[Shibby1485]

avoid the VAPORS. Deadly.

um.... YEA!!!! i definitely lost 5-10 years off my lifespan between burning epoxy and cutting SMC without a mask ... that smoldering epoxy does all but strip every last breathe of oxygen out of your lungs

[mrbtd]

Is this material to thick for the mid-shaft support ? It measures just over 1/2" I wanted to get the correct width cut (ski not @ home yet).

[mrbtd]

forgot pic

[jeffsntx]

WAY too thick.

[jetskibum1]

Mid shaft Bracket Question.

Excuse my lack of knowledge on this topic but as I have just started work on a GPR conversion, can anyone tell me why I cant change the drive line sealing system for a Rad 4 Racing one using a one piece drive shaft from the Yamaha Skat 14 vein pump to the seadoo out put spline?? Then I am thinking I can just run a through hull fitting direct to the hose and no brg carrier required.

Hit me with the reasons as I think I am going to have a million more questions as the progress gets started. `

[Hydrotoys]

A few things here...
The drive shaft from a Yamaha skat pump is effectively no different than a stock driveshaft from a gpr with length and splines.
The end of it has a capture for a bearing, versus the screw on Yamaha shaft, but they work out to the same length. You can do something like Hydrojunkie has done by cobbling together a Yamaha driveshaft with an adaptor for the SD pump, and create an adaptor to make the SD pump work.

It won't replace the conversion shaft. Remember you are hooking a SD engine with a crown spline drive system to a Yamaha that used a screw-on 5 finger coupler. It's not a direct swap.

The bearing seal you posted is very similar to what I'm testing now...but of the correct size, for the conversion Mid-shaft. The bracket isn't even necessary...just a water seal is. You are on the right track, but the SEAL dimensions are wrong for a Yami system... and it's obscenely EXPENSIVE.


There are probably at least 2 viable ways to make a conversion shaft, and at least a hundred ways to make a single system.

[Hydrotoys]

plus...
if it ain't broke, don't fix it.

[RX951]

question, are you guys using 4200/5200 to seal the the midwall triangle piece to the hull? Or a rubber gasket? I'm just thinking that water will see this plate and can leak thru. So....I'll prolly use some 4200 to shoot inbetween the plate and triangle peice...

I could make a gasket, but I'm at a point where I already mounted my plate holding the intermediate shaft and the motor is aligned. I can get the hose and traingle piece in there, but its tight. If I use a rubber gasket, it may tear....but.....we'll see. Mayne I can work some 4200 in there with an art brush, then snug it up to the plate

[Hydrotoys]

I used 4500 on some and a gasket on others. As thick as your plate is, I'd say that sealant would work.

[Insanediego Joe]

I used 4500 on some and a gasket on others. As thick as your plate is, I'd say that sealant would work.

sealant!

[rangermtb5]

in the first post, the third picture, what is the thing that looks like a rubber hose? i know it seals the water out, but is there a specific hose or something that is used?

[Hydrotoys]

stock hose or a high quality hose from Napa. I use one from Napa.

Currently running no bracket. No long term data.

[cliff0413]

i dont have a rubber hose on my bearing carrier, and i notice at high rpm water shoots out of that little nipple is that right?