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Author Topic: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front  (Read 11670 times)

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #20 on: Dec 19, 2015, 11:00:08 »
Ain't it fun to tinker
burning bridges sometimes light the most productive paths

Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #21 on: Mar 13, 2016, 05:03:25 »
Working on suspension / brake force load tests and steering link design.

~1,400 lbs of brake force (2g brake)


Bump showing 5.5 inches trave (waiting on scale for force gauged test)


Steering link model (aproximate)

Offline Eleganten

  • Posts: 116
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #22 on: Mar 13, 2016, 16:01:04 »
Sweet!


Sent from my iPhone using Tapatalk

Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #23 on: May 15, 2016, 01:19:06 »
Steering links are done.



So, I took it for ride, soap box derby style.


Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #24 on: Aug 02, 2016, 03:57:38 »
Cable actuated master cylinder (a stock part) mounted to the fork so I can run hard lines.  Will be using inverted levers to pull the cables.  The BMX bars also stay, but will be modified a bit (for ergo and cable exits) - reach as shown in photo is great, but the wrist angle is all wrong.

« Last Edit: Aug 02, 2016, 03:59:29 by sebwiers »

Offline hillsy

  • Posts: 4117
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #25 on: Aug 03, 2016, 00:03:38 »
I have no idea whether this thing is going to be beyond awesome or spontaneously combust but I love the fact that you just keep going with it.

Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #26 on: Jan 04, 2018, 02:06:08 »
Ended up being a bit of both.  I got it running in 9/2017 and it rode quite nice, though the shock was a bit soft.  But I blew up the engine when an oil line melted (they run very close to the pipes down near the oil filter).  I got new engine is in for $500, and I upgraded the shock to a Huyabuse unit (850 lbs / in vs 650) and was quite happy with it, but only got to do a few short rides before the snow hit.  I'm currently adding crash bars and ice studs to go ice riding at Mama Tried!

The first (and only) long ride... so far.


Replaced engine.  Replaced front shock with Hybausa unit (850 lbs/in vs 650 lbs/in).  Rides much better.


Built crash bars.  Still plan a few things.  A custom front shock linkage will improve the wheel rate curve to make it slightly progressive, and give me a bit of extra travel.

Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #27 on: May 22, 2018, 17:18:30 »
Bike is back on the road this spring as a daily rider.  As designed for, its a fun traffic carver even with lane splitting being illegal - the reduced brake dive makes constant brake / throttle cycling less obnoxious, and it flicks through lane changes at a thought and goes over potholes at a 45 degree lean quite happily.  Could use a bit more power and/or better aerodynamics; it does OK off the line but roll on past 60 is disappointing.

I'm planning a ~800 mile trip for this weekend, mostly on boring roads though.

« Last Edit: May 22, 2018, 17:20:14 by sebwiers »

Offline kdsmf

  • Posts: 13
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #28 on: May 22, 2018, 17:26:15 »
Very cool, looks like something from Road Warrior.

Offline sebwiers

  • Posts: 35
Re: '81 Yamaha XJ750 Seca w/ monolver rear and Hossack front
« Reply #29 on: May 22, 2018, 17:35:38 »
Yeah, I've always been a fan and while I was doing the early build I found out about some local Mad Max themed rides and a big Mad Max themed camping festival in CA.  Given my fairly crude fabrication skills, I figured I'd just run with it as an aesthetic. 



I got to play on the track with some other Mad Max fans at the Flat Out Friday races in Milwaukee the weekend of the Mama Tried show.

« Last Edit: May 22, 2018, 17:39:55 by sebwiers »