Page 5 of 5 FirstFirst ... 345
Results 41 to 45 of 45
  1. #41
    One thing about back testing things is you have to be certain to keep the variables exactly the same especially weather conditions.On the SHO advancing the stock intake cam 5 degrees and retarding the exhaust 2 degrees if done correctly is a minimum of 150 rpms.If you run a compression gauge on the ski before and after just those changes you will see a minimum of a 20 psi increase in each hole.

  2. #42
    pwc4life's Avatar
    Join Date
    Sep 2010
    Location
    Earth
    Posts
    409
    +1
    26
    Quote Originally Posted by FXSlowKroozer View Post
    One thing about back testing things is you have to be certain to keep the variables exactly the same especially weather conditions.On the SHO advancing the stock intake cam 5 degrees and retarding the exhaust 2 degrees if done correctly is a minimum of 150 rpms.If you run a compression gauge on the ski before and after just those changes you will see a minimum of a 20 psi increase in each hole.
    Thanks for the info Kroozer. From your testing, have you found that you must retard the exhaust cam to gain top end performance? I find it interesting per the instructions I have from R&D that they only suggest advancing the intake cam to gain power throughout the RPM range whereas Riva suggests this will only affect the bottom end. I'll try and post a screenshot of the R&D instructions I have for the '13 and up gears shortly.


  3. #43
    pwc4life's Avatar
    Join Date
    Sep 2010
    Location
    Earth
    Posts
    409
    +1
    26
    R&D suggested settings. A bit odd when you compare their recommendations to Riva's.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Suggested settings.jpg 
Views:	38 
Size:	170.5 KB 
ID:	456043   Click image for larger version. 

Name:	Settings.jpg 
Views:	36 
Size:	184.3 KB 
ID:	456044  

  4. #44
    The R&D and Riva gears are not the same you have to follow the instructions closely for each because they move the cam around completely different.Also what works for the SHO wont be the exact same for the SVHO so the same goes there.For me on the SHO with stock cams the intake 5 degrees is what has always given the rpms.Retarding the exhaust or advancing the intake even more just seems to move the power around so you get a little more acceleration but nothing in terms of speed.

  5. #45
    pwc4life's Avatar
    Join Date
    Sep 2010
    Location
    Earth
    Posts
    409
    +1
    26
    Thanks Kroozer. Appreciate the help!

  6. +1 by:


Page 5 of 5 FirstFirst ... 345

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. SOLD 1.8 Adjustable Cam Gears/ Sprocket (APE)
    By ksalles in forum Yamaha Classifieds
    Replies: 2
    Last Post: 03-23-2017, 07:21 AM
  2. Sheared cam sprocket bolts...
    By ou812 in forum 4-Tec Performance
    Replies: 15
    Last Post: 10-13-2016, 01:41 PM
  3. Tan Plastic Thing Attached to Cam Sprocket on 4tec Engine
    By rferrel1 in forum 4-Tec Performance
    Replies: 6
    Last Post: 08-08-2014, 07:52 PM
  4. WTB Rotax lightened cam sprocket
    By Stockrxp in forum Sea Doo Classifieds
    Replies: 3
    Last Post: 12-10-2011, 10:55 AM
  5. WTB Set of Cam Sprocket Bolts (3) New
    By Ocman in forum Sea Doo Classifieds
    Replies: 7
    Last Post: 02-23-2011, 10:34 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
  •