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  1. MTRHEAD

    R&D powervalve yamaha cylinder

    Probably was a 6 or 8mm with 132 ktm or rad rods and a .125 or .060” baseplate if it had round tops. If it had flats could of been 8mm with 132 ktm/rad rods or Kawasaki rods (Suzuki tiger shark). either way it was more than likely for a 6mm or 8mm probably Since with 8mm it comes out timing...
  2. MTRHEAD

    R&D powervalve yamaha cylinder

    What is the overall height of the cylinder?
  3. MTRHEAD

    Worx 228 vs 201 on 2008+ SJ

    Worx 228 is best all around and will give good top speed. 201 will scrub up to 2mph off on glass. But if riding rough water, surf or max bite/stuff 201 works well. If you asking because you can get an old 201 cheap then do it. You can also cut an old 201 to be like a 205/228.
  4. MTRHEAD

    Want to Buy 701 motor

    Check eBay on cases. Many mint ones lately in 125-150 range there is a set right now for exactly $125 shipped (actually many to choose from). No cracks
  5. MTRHEAD

    TNT v3 chamber *COMP Stinger*

    I was just curios to the inner diameter.
  6. MTRHEAD

    Anyone still have theses carbs?

    SRE. Scott Randle Engineering. Spelling Maybe wrong. I think he made heads too? Maybe under East Coast Performance Products. Like WPP but EPP I tried these 20+ years ago
  7. MTRHEAD

    importance of the correct return jet sizing

    I recently did a standard modified b pipe ,reeds, head, ignition mod superjet for a buddy with oem760 44’s (drilled out and passage filled) and we ended up at 85 and it was a world better than oem.
  8. MTRHEAD

    TNT v3 chamber *COMP Stinger*

    What is the ID of the stinger?
  9. MTRHEAD

    Dasa 785cc

    since your dealing with 85.5 and stock crank maybe yours has low port height. Normally 785 was 81 bore +8mm stroke.
  10. MTRHEAD

    WTB Mikuni sbn 38 throttle plate 190

    Pm me your address and I’ll put these in the mail. Not unless your in Oakland county and want to pickup I would just recommend sanding with 400+ on a flat surface. To clean up
  11. MTRHEAD

    WTB Mikuni sbn 38 throttle plate 190

    Give me a few. I just removed 19’s from a set of 38’s. If I didn’t throw them away you can have them Note: 15’s are for Mikuni oem 38’s with 3 low speed holes (Aftermarket Mikuni carbs) 19’s are for Mikuni Yamaha twin 38’s. They only have 2 low speed holes (all 701’s with twins)
  12. MTRHEAD

    Dasa 785cc

    You could purchase 26cc domes for that head back in day. 23cc was standard superstock size. what is your psi with valves open? If it’s around 195 psi your setup is standard. domes are flat top or Kawasaki squish. Those piston crowns are Kawasaki style
  13. MTRHEAD

    ecwi microtouch jumpers?

    Less than 48hrs. Under $7.
  14. MTRHEAD

    FS. ATP EPIC HX3 ignition

    Bump. Open to trades, partial trades, realistic offers
  15. MTRHEAD

    Did Yamaha paint any 760's black?

    Those motors are not assembled in USA. “Japan”. Those were imported complete and never saw the Georgia plant
  16. MTRHEAD

    Did Yamaha paint any 760's black?

    That is a wiseco piston. All of my 760 cylinders are black. I think at least one of mine came from waveblaster2. Many black 760 motors out there.
  17. MTRHEAD

    ecwi microtouch jumpers?

    Thanks. Holy smokes. 200 for $7 on amazon. Arrives Monday. thanks to everyone!
  18. MTRHEAD

    ecwi microtouch jumpers?

    Where is a good source for the microtouch ecwi jumpers? Are they a common electrical part? Need some
  19. MTRHEAD

    R&D powervalve yamaha cylinder

    95% of every pro level boat was 198. Most 7500-7800 rpm
  20. MTRHEAD

    R&D powervalve yamaha cylinder

    Typical race motor. 7700. Give or take 40. Type 9 dry pipe
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