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Author Topic: Jeff jet 1750  (Read 9351 times)

Offline Jeff B

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Re: Jeff jet 1750
« Reply #30 on: May 09, 2021, 07:38:28 AM »
Manual power valve actuation
Be interesting to see what difference it makes.

* IMG_20210509_57215.jpg (125.13 kB, 1024x768 - viewed 701 times.)
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Offline Jeff B

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Re: Jeff jet 1750
« Reply #31 on: May 09, 2021, 07:40:23 AM »
Copper wrapped I big portion of chamber, then wrapped with fiberglass tape, yucky and itchy.
Pre heat rawxwater around exhaust before entering cylinder

* IMG_20210509_3929.jpg (145.53 kB, 1024x768 - viewed 694 times.)
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Offline Jeff B

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Re: Jeff jet 1750
« Reply #32 on: May 09, 2021, 07:41:26 AM »
Started on engine cover/seat. Plenty room.....

* IMG_20210509_29917.jpg (96.29 kB, 1024x768 - viewed 693 times.)
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Offline Tones

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  • Gettin sore eyes lookin for Swifty's boat. SWIFTY?
Re: Jeff jet 1750
« Reply #33 on: May 09, 2021, 15:44:44 PM »
Quote from: Paul on May 03, 2021, 17:12:06 PM
How can a belt be rated for a torque?  Surely, that depends totally how many teeth are engaged on the pulleys and the diameter of the pulleys..
By the width of the belt.
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I'm going to die without an enemy in the world cause I will out live the barstards

Offline Paul

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Re: Jeff jet 1750
« Reply #34 on: May 09, 2021, 16:59:02 PM »
Quote from: Tones on May 09, 2021, 15:44:44 PM
By the width of the belt.
That's not relevant. Belt width would just be proportional to breaking tension

Torque is "force x radius". If radius is unknown, then torque is unknown.  If you put the same belt on a larger pulley, it is now capable of more torque tansfer, hence torque rating on a belt alone is meaningless.
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Offline Jeff B

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Re: Jeff jet 1750
« Reply #35 on: May 09, 2021, 18:47:48 PM »
Used up all my little offcuts of EVA foam, made seat/engine cover.

* IMG_20210509_13520.jpg (102.71 kB, 1024x768 - viewed 645 times.)

* IMG_20210509_9873.jpg (110.66 kB, 1024x768 - viewed 675 times.)
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Offline Jeff B

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Re: Jeff jet 1750
« Reply #36 on: June 01, 2021, 05:55:55 AM »
Few more small things to finish then test time.

* IMG_20210601_18317.jpg (118.41 kB, 1024x768 - viewed 472 times.)
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Offline Henry

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Re: Jeff jet 1750
« Reply #37 on: June 01, 2021, 10:17:05 AM »
Good entertainment value, cant wait to see it going.
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Offline steelo

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  • Currently boatless
Re: Jeff jet 1750
« Reply #38 on: June 01, 2021, 11:11:53 AM »
Inspirational Jeff. Can?t wait to see some action shots or video
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Offline Jeff B

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Re: Jeff jet 1750
« Reply #39 on: June 01, 2021, 12:46:36 PM »
I'm hoping that when the belt fails it will just rip the teeth off (when the mighty 125 hits power band) rather than shreds the belt right off, that way I should still be able to putter back to boat ramp....
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Offline Paul

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Re: Jeff jet 1750
« Reply #40 on: June 01, 2021, 16:01:28 PM »
Maybe a snorkel for the carb intake?  It looks pretty close to the sucking up water from the rear corner?
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Offline Jeff B

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  • Posts: 5178
Re: Jeff jet 1750
« Reply #41 on: June 13, 2021, 07:03:14 AM »
Finished off drive setup, used a keyless taper lock on pump shaft. And welded the honda cam pulley to yamaha drive gear engine side.
Belt is tensioned with slot and thread so whole engine moves.
Hope my drive ratio is calculations are accurate....

* IMG_20210613_25556.jpg (81.71 kB, 1024x768 - viewed 341 times.)
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Offline Jeff B

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Re: Jeff jet 1750
« Reply #42 on: June 13, 2021, 07:06:01 AM »
Got sick of waiting for my new Vespa bevel drive starter to turn up so fitted an old Kawasaki starter, just fits.
A kick start or pull start was not going to be too practical

* IMG_20210613_41225.jpg (95.2 kB, 1024x768 - viewed 331 times.)
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Offline Jimmy Jet

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  • Posts: 474
Re: Jeff jet 1750
« Reply #43 on: June 13, 2021, 10:24:19 AM »
I think the power valve will make a huge difference. Years ago I rebuilt the top end on my 93 CR250 and incorrectly re-installed the PV actuation rod. The bike would rev to about mid-range and then just go flat, full boggy.
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Offline Henry

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  • Posts: 557
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Re: Jeff jet 1750
« Reply #44 on: June 14, 2021, 08:37:26 AM »
Starter motor look heavy tho. Half as much as the engine.
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