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Author Topic: 2 stroke comeback.  (Read 20300 times)

Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #75 on: June 24, 2020, 21:31:04 PM »
Fuel tank fitted, 44mm filler. Hopefully I can tip it in faster than it burns through it...
Made a billet breather too

* IMG_20200624_28961.jpg (90.06 kB, 768x1024 - viewed 612 times.)

* IMG_20200624_18116.jpg (61.75 kB, 1024x768 - viewed 606 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #76 on: June 25, 2020, 20:43:46 PM »
Plumb up the exhaust.
Custom tuned to get peak hp @6350rpm....I think..... pop

* IMG_20200625_49215.jpg (129.21 kB, 768x1024 - viewed 579 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #77 on: June 26, 2020, 12:30:58 PM »
Engine cover fitted.

* IMG_20200626_2088.jpg (86.16 kB, 768x1024 - viewed 542 times.)

* IMG_20200626_10188.jpg (90.22 kB, 1024x768 - viewed 545 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #78 on: June 26, 2020, 12:32:45 PM »
Pop up cleat on top of transom.
Handy for towing broken down seadoos, suzukis.....and possibly Daewoo.... st

* IMG_20200626_33472.jpg (82.6 kB, 1024x768 - viewed 543 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #79 on: June 26, 2020, 21:04:08 PM »
Make a start on wiring.
Pretty basic system, CDI for spark and seperate ECU that controls advance.
I just unplug the grey wire to disable rev limiter... ::)

* IMG_20200626_28877.jpg (117.83 kB, 768x1024 - viewed 529 times.)

* IMG_20200626_21504.jpg (155.42 kB, 768x1024 - viewed 526 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #80 on: June 29, 2020, 19:40:35 PM »
Wiring up the dash.

* IMG_20200629_30424.jpg (109.32 kB, 1024x768 - viewed 444 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #81 on: June 29, 2020, 22:11:28 PM »
https://youtu.be/YDXrPai-xeE
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #82 on: June 30, 2020, 08:06:20 AM »
Seems to run pretty good.
A bit quieter and a lot smoother than I predicted. I guess more cylinders smooths things out a bit. I'm still not sure of the exact firing order but it's a 90 degree v6 as opposed to the more common 60 degree v6. Not sure on mr Yamaha's reasoning behind it? Above my pay grade....
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Offline quattro

  • Website Member
  • Posts: 14
Re: 2 stroke comeback.
« Reply #83 on: June 30, 2020, 08:23:20 AM »
Sounds mean

90 degree v6s because they made 90 degree v4s. Although omc did make 60 degree v4s along side 60 degree v6s and 90 degree v6s. The 60 degree v4s are very compact
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Offline Kakapo76

  • Website Member
  • Posts: 546
Re: 2 stroke comeback.
« Reply #84 on: June 30, 2020, 08:27:27 AM »
Quote from: Jeff B on June 30, 2020, 08:06:20 AM
Seems to run pretty good.
A bit quieter and a lot smoother than I predicted. I guess more cylinders smooths things out a bit. I'm still not sure of the exact firing order but it's a 90 degree v6 as opposed to the more common 60 degree v6. Not sure on mr Yamaha's reasoning behind it? Above my pay grade....

Should get a lot quieter with water running through it as well?
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #85 on: June 30, 2020, 09:50:05 AM »
Yeah a lot of the parts are interchangeable between the v4 115/140hp v4 Yamaha, pistons, carbs etc. Makes parts availability not too bad.
Will be quieter with water for sure. Dont want it too quiet though. This is the Banshee of jet boats...
Few bits to finish on pump then I can test run it.
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #86 on: June 30, 2020, 20:34:09 PM »
Put floor in, foot throttle.

* IMG_20200630_18478.jpg (79.75 kB, 1024x768 - viewed 372 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #87 on: June 30, 2020, 20:36:02 PM »
Electric trim. Switch on steering wheel and trim gauge.
All the mod cons (for a hardcore adventure boat)

* IMG_20200630_3024.jpg (78.76 kB, 1024x768 - viewed 373 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5176
Re: 2 stroke comeback.
« Reply #88 on: July 01, 2020, 19:28:50 PM »
https://youtu.be/6BU7-i1efp8
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Offline Kakapo76

  • Website Member
  • Posts: 546
Re: 2 stroke comeback.
« Reply #89 on: July 01, 2020, 21:41:03 PM »
Looks good Jeff! How does it jump out of the hole?
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