Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13

Thread: R&D Cast Head

  1. #1
    Budman's Avatar
    Join Date
    Jul 2008
    Location
    Montana
    Posts
    341

    R&D Cast Head

    Has anybody used a R&D head on a gp1200? Does it use an o-ring and a gasket? R&D is closed till monday so I thought someone on here might know. The pics show a groove around the dome but not around the water jackets. Also what would the compression be with 37cc dome?
    Thanks


  2. #2
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Location
    Madison, WI, USA
    Posts
    2,500
    +1
    55
    37cc on a stock port GP1200 should give you 165 to 170psi. A ported cylinder will probably drop that down to 150 to 160 psi range I bet.
    I thought the R&D heads were all oring sealed but not sure

  3. #3
    Banned User
    Join Date
    Aug 2011
    Posts
    5,049
    +1
    238
    Quote Originally Posted by Cutlass View Post
    37cc on a stock port GP1200 should give you 165 to 170psi. A ported cylinder will probably drop that down to 150 to 160 psi range I bet.
    I thought the R&D heads were all oring sealed but not sure
    Which should be using race gas or a race gas mix

  4. #4
    Budman's Avatar
    Join Date
    Jul 2008
    Location
    Montana
    Posts
    341
    I bought one on ebay. I hope it wasn't a mistake. No o-rings or gasket.

    http://www.ebay.com/itm/R-D-1100-120...vip=true&rt=nc

  5. #5
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Location
    Madison, WI, USA
    Posts
    2,500
    +1
    55
    With the ported cylinders and the high elevation you ride at, you might be able to get away without race gas...maybe.

  6. #6
    Budman's Avatar
    Join Date
    Jul 2008
    Location
    Montana
    Posts
    341
    I'm hoping it will be about 150 PSI. The porting brought my milled head down to 126 PSI. Once I get the compression checked I will post about carb settings.
    By the looks of it I think it uses a special gasket besides the o-rings.

  7. #7
    Budman's Avatar
    Join Date
    Jul 2008
    Location
    Montana
    Posts
    341
    Just got off the phone with R&D. Turns out it uses o-rings around the cylinder and liquid gasket maker around the water jackets. That's easy enough. This head plus some boyesen pro reeds should boost power.
    Last edited by Budman; 02-11-2013 at 05:06 PM.

  8. #8
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Location
    Madison, WI, USA
    Posts
    2,500
    +1
    55
    sweet. good to know!

  9. #9
    Budman's Avatar
    Join Date
    Jul 2008
    Location
    Montana
    Posts
    341
    Just scored some riva sponsons on ebay for $35.00 shipped. Not bad. Oh spring time where are you?

  10. #10
    Pistonwash's Avatar
    Join Date
    Aug 2005
    Location
    Florida
    Posts
    3,595
    +1
    77
    Quote Originally Posted by Budman View Post
    I bought one on ebay. I hope it wasn't a mistake. No o-rings or gasket.

    http://www.ebay.com/itm/R-D-1100-120...vip=true&rt=nc
    I have never liked them unless I used it for racing and high compression.

    They may look nice but the OEM head actually cools better than aftermarket billet heads..I would stick with the OEM and have it re-milled and squished for rec riding. You can run 93 octane and 170 lbs. of cranking pressure and be ok. Send it to Woody or Lowell for the machine work and your ski will be better off in the long run. The O-rings can be a pain to deal with at times.

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. Looking for Riva dome for 66v or riva cast heads
    By JgDieselPerformance in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 05-17-2016, 11:24 PM
  2. FS - Parts Gp1200r riva cast heads
    By WAGZ102 in forum Yamaha Classifieds
    Replies: 6
    Last Post: 09-04-2014, 01:08 PM
  3. FS - Parts 1300r Riva cast heads, (5) 60T gp1300r cylinders Tim Judge ported, 2 new PV
    By vshockey10 in forum Yamaha Classifieds
    Replies: 13
    Last Post: 02-12-2013, 05:22 PM
  4. WTB: 1300R Riva Cast heads
    By WB800BLASTER in forum Yamaha Classifieds
    Replies: 3
    Last Post: 11-20-2008, 09:36 AM
  5. GirdledHardware for Riva cast heads..need some help!
    By IrishGpr05 in forum Yamaha PWC Performance (2-stroke)
    Replies: 18
    Last Post: 04-29-2006, 08:28 AM

Posting Permissions

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