Page 1 of 2 1 2 LastLast
Results 1 to 10 of 18
  1. #1
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85

    GPRXP Midshaft bracket

    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.











  2. #2
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    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.

  3. #3
    EZ Dock of Long Island Shibby1485's Avatar
    Join Date
    May 2005
    Location
    Long Island, NY
    Posts
    9,464
    +1
    4
    Quote Originally Posted by Hydrotoys View Post
    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

  4. #4
    mrbtd's Avatar
    Join Date
    Jul 2005
    Location
    Lindenhurst, Illinois, United States
    Posts
    4,309
    +1
    2
    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).

  5. #5
    mrbtd's Avatar
    Join Date
    Jul 2005
    Location
    Lindenhurst, Illinois, United States
    Posts
    4,309
    +1
    2
    forgot pic
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	DSC00521.JPG 
Views:	165 
Size:	2.92 MB 
ID:	95206   Click image for larger version. 

Name:	DSC00522.JPG 
Views:	147 
Size:	2.95 MB 
ID:	95207  

  6. #6
    My son (mohawk man) jeffsntx's Avatar
    Join Date
    Sep 2006
    Location
    Belton TX
    Posts
    2,598
    +1
    1
    WAY too thick.

  7. #7
    jetskibum1's Avatar
    Join Date
    Jun 2007
    Location
    Tairua New Zealand
    Posts
    496
    +1
    11

    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. `
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	R4R_thruhullfittingRXP copy.jpg 
Views:	200 
Size:	127.3 KB 
ID:	103980  

  8. #8
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    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.

  9. #9
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    plus...
    if it ain't broke, don't fix it.

  10. #10
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    Location
    League City, Texas
    Posts
    16,066
    +1
    23
    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

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. WTB Looking for GPRXP midshaft
    By joewharton2 in forum Conversion Skis Classifieds
    Replies: 1
    Last Post: 10-21-2016, 03:40 PM
  2. SOLD WTB GPRXP MIDSHAFT 1st GEN
    By YamahaManny in forum Conversion Skis Classifieds
    Replies: 34
    Last Post: 06-27-2016, 12:21 PM
  3. SOLD 14 vein skat-trak pump w/ 2" setback (also for sale gprxp midshaft)
    By Danetwork in forum Conversion Skis Classifieds
    Replies: 3
    Last Post: 11-21-2015, 05:46 PM
  4. SOLD GPRXP midshaft
    By WFO in forum Conversion Skis Classifieds
    Replies: 1
    Last Post: 10-12-2015, 10:36 PM
  5. WTB - Parts WTB Midshaft gprxp
    By iron head in forum Conversion Skis Classifieds
    Replies: 1
    Last Post: 01-23-2012, 01:11 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •