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Author Topic: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front  (Read 11406 times)

Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #10 on: Jul 24, 2014, 02:42:22 »
The travel is the very close to same, and I can mount both the mono shock and the old shocks at the same time (is how I 'jigged' it for welding) so starting position is the same.  Its a montauk shock, top shackle bolt runs through urethane bushings (with a brass sleeve between bushing and bolt).  I bought a used montauk shock cheap, figured it would work OK (using high effective leverage) because the montauk and the seca have very similar weight and rear travel. 
« Last Edit: Jul 24, 2014, 02:45:19 by sebwiers »

Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #11 on: Jan 02, 2015, 02:11:45 »
Update - Finally got enough of the bits machined and welded to frame that I could mount the front wheel in place (using a mock-up wood part for lower arm, looking at figuring out shock mount / arm design).




Offline SaltCityCafe

  • Posts: 388
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #12 on: Jan 03, 2015, 13:16:01 »
Crazy, im in

Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #13 on: Jan 03, 2015, 23:56:06 »
Got some of the bugs sorted in a second mock up.  Namely, the wheelbase is now 4 inches shorter.  Which changes the dynamics some (not in a bad way) and makes locating the shock as previously shown impossible, but that's OK because I had something better in mind.  Gonna be a pull-link actuated set up, sitting behind the front wheel.  Heat may be a concern, but that's what pipe wrap is MADE for.  Might even route the pipes above the engine.



Steering lock is also vastly improved with this upper arm configuration, something I should have planned from the start.


Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #14 on: May 23, 2015, 00:18:46 »
Finally got it rolling on two wheels.  Am pleasantly suprised with the 'stance'.  Is very lumpy though, gonna tweak the flow a bit by angling the tops of the side plates and otherwise sharpening some of the blunt bits up front.  Still intentionally breaks every rule about graceful lines, but the fact it's crazy low (bars will only come up maybe 1 inch from head tube) may help it work.






Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #15 on: Nov 18, 2015, 21:13:23 »
Had it all apart for a while so I could redesign the arms to be much shorter and without any threaded parts getting flexed, and do some cutting to lighten parts like the fork bridge.  Got the lower shock mount done, bolted it back up, and started fitting the shock link turn buckles.






Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #16 on: Nov 29, 2015, 19:39:00 »
Its on its own two wheels and able to bounce up and down on the shocks now.  Album of pics is http://imgur.com/a/3Vu0s


Offline mazza

  • Posts: 26
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #17 on: Dec 17, 2015, 15:44:42 »
Wow.....I'm in....


Offline irk miller

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Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #19 on: Dec 19, 2015, 10:28:50 »
I have no idea what's going on here, but it looks like quite a show.