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  1. MTRHEAD

    Engine WTB. Cast Lamey/Dasa/R&D/Riva cylinder (small bore original)

    Lol. I sold some brand new castings like dummy a few years back.
  2. MTRHEAD

    Engine WTB. Cast Lamey/Dasa/R&D/Riva cylinder (small bore original)

    When you get a chance send a pic. im sure I’m going to need to post for sleeves Someday. I know people have them because so many people went big bore
  3. MTRHEAD

    Engine WTB. Cast Lamey/Dasa/R&D/Riva cylinder (small bore original)

    WTB: Cast cylinder. - SMALL BORE not big bore Preferred Can be: bare cylinder, old before PV stock, 5, 8, 10, stroke please PM
  4. MTRHEAD

    SOLD Buckshot 44s with Riva Intake, reeds, and stuffers

    That’s a RIVA intake
  5. MTRHEAD

    SOLD Riva dual intake manifold and reed spacer

    FS: 701-760 Riva dual manifold with Reed spacer (not modified/ported). $100 shipped in USA.
  6. MTRHEAD

    SOLD 61x ported cylinder and pistons 736cc

    For sale 61x cylinder ported at 83mm - 735cc Deck height - stock 119 (measures 118.9mm) Ex port width 55 Ex port duration 180-181 appx 39mm down assuming oem base gasket Transfer port duration 119-120 appx 55mm down assuming oem base gasket Boost port widened and lowered Transfer inlets raised...
  7. MTRHEAD

    Reducing Bpipe stinger diameter?

    When we were racing superstock SXR’s once the CC was allowed to go to 850 we would cut off the 41mm and go larger. The waterbox became the air throttle on BP. Until we got over 850 the stock water box was fine. Sure some people drilled some holes but overall it was just fine for top Pro...
  8. MTRHEAD

    Flywheel Lightening

    Yes believe it or not it lost its magnetism or a whole bunch. You can still feel some with a screw driver but not much. You can google it. Get magnets hot for too long and they loose the magnetism. It happened also to me on a 550 jetnetics and on a Vilder 62t wheel.
  9. MTRHEAD

    Flywheel Lightening

    Be careful. I bought one, 760 wheel, that was done by one of these guys. It no longer charged. The magnets got too hot from machining. Maybe dull tooling? I posted about it. Talk about a wild goose chase. Put in a non machined wheel and it charged! Put back in the machined and it didn’t...
  10. MTRHEAD

    Reducing Bpipe stinger diameter?

    As you make the stinger smaller the back pressure increases. Note: Most small twin cyl Jetski race pipes are 41mm-44mm If you do decide to make your stinger smaller for increased performance. Please note you may need to revisit your dome profile (cc, squish,shape) , timing, prop load! and...
  11. MTRHEAD

    Used R&D Wet Pipe For Superjet

    Yes and OEM works best 99% of the time
  12. MTRHEAD

    SXR Modifying the stock water box?

    If your putting a 951 doo in an sxr put a 951 seadoo box in your ski. They fit with a little mod. Mel miller proved on the dyno and field testing nothing made more power on his race motors including twin pipe 1100cc strokers. Do a google search and you can read all about.
  13. MTRHEAD

    Yamaha Wave Blaster 1 Driveshaft DIAMETER

    Blaster driveshaft. Identical at each end to the superjet. Just longer and it doesn’t neck down. The 701 superjet shaft doesn’t neck down either. Only early 650 stuff. But they ALL interchange
  14. MTRHEAD

    Yamaha Wave Blaster 1 Driveshaft DIAMETER

    650 superjet shaft is necked down between seal surfaces and splines. But same exact specs on each end as every single Yamaha twin ski basically 650+.
  15. MTRHEAD

    Yamaha Wave Blaster 1 Driveshaft DIAMETER

    They are same splines. Gp1200 is same splines! I will post pics of each within 20 minutes
  16. MTRHEAD

    Yamaha Wave Blaster 1 Driveshaft DIAMETER

    You will need to do some fabrication to make it all work. You can buy a kit on eBay but it’s $$
  17. MTRHEAD

    Yamaha Wave Blaster 1 Driveshaft DIAMETER

    Yes driveshaft fit perfect! Blaster will work but it’s too long for what I did. I used a pump I had. Probably a pump for 90-20. All really the same. The older ones just have that bilge function. Pumps technically are same 90-2020 I used the 90 midshaft housing but upgraded to the 95-20...
  18. MTRHEAD

    Yamaha Wave Blaster 1 Driveshaft DIAMETER

    I used an 08 driveshaft which set mine back 2” That way it’s legal in rule book for vintage racing technically. 650 driveshafts are skinny. It was also easy to do but you have to machine a wear ring. Note: Skat setbacks are 30mm setback so this combo adds 20mm to what Skat did but moves...
  19. MTRHEAD

    Pipes??

    Or Rolex watches!
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