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Author Topic: Yamaha Twinjet YL1 Salt Lake Racer  (Read 7893 times)

Offline suuscustoms

  • Posts: 193
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #10 on: Feb 01, 2014, 23:06:22 »
It's time to make an exciting announcement I've been waiting for confirmation about.  On February 28th this year we will be taking the TwinJet SALT LAKE RACING!

We will be heading over to Lake Gairdner in South Australia to compete in the 100cc modified production gasoline category at the DLRA's Speed Week 2014.  It will be great fun to take this unique old bike out to the salt and see what it is capable of.


For this reason we have been busy making the TwinJet a LOT louder in the aim of making it a little bit quicker.  After much fettling we have fitted up a wonderful pair of handmade expansion chambers based on designs by Yamaha's racing department back in the 1960's for this engine.  They took a lot of work to squeeze around other components but the end result sounds amazingly and will hopefully give us a bit more power in the sweet spot.


Suus: Reimagined/Recycled/Upcycled Cool
https://www.facebook.com/suuscustoms

Offline suuscustoms

  • Posts: 193
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #11 on: Feb 01, 2014, 23:08:16 »
On the topic of racing, can anyone advise me on how to fit a kill switch to the Yamaha?

They were never fitted with one, and they have 2 separate coils (1 for each cylinder).  From what I can see in a wiring diagram each coil has an independent wire coming up from the engine (a trigger I assume) and both share a common brown wire.

from what I can see in the wiring diagram below the brown wire is the power feed to everything on the bike.  If I was to earth the brown wire using a kill switch I imagine that I would basically be hooking up the battery to the frame (bad thing, melty wires) is this correct?

[img src="http://smokeriders.com/diagrams/Yamaha/Twins/YL1.gif" alt=" "]
Suus: Reimagined/Recycled/Upcycled Cool
https://www.facebook.com/suuscustoms

Offline suuscustoms

  • Posts: 193
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #12 on: Feb 06, 2014, 04:22:30 »
A bit more work this week on the Twinjet.  Exhaust all painted up, racing spec chainguard and battery bracket made up.  Still having running issues but will hopefully have it sorted soon.



Suus: Reimagined/Recycled/Upcycled Cool
https://www.facebook.com/suuscustoms

Offline suuscustoms

  • Posts: 193
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #13 on: Feb 15, 2014, 02:34:49 »
Slow progress on the Twinjet.  A carbie rebuild fixed the running issues, although a tune is certainly in order.  I am going to have to scratch-build a kill switch this week to make it work with the Yamaha's wiring. Seat is back from the trimmer and looking good, and racing number plates are on.

Suus: Reimagined/Recycled/Upcycled Cool
https://www.facebook.com/suuscustoms

Offline suuscustoms

  • Posts: 193
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #14 on: Mar 18, 2014, 00:11:52 »
We did it! a 3000km round trip and a week on the salt but we loved every minute.  The Yamaha gave us some grief, the old 6V electrics weren't up to full throttle racing anymore and a weak spark on one cylinder resulted in only acheiving 54 miles per hour, but we were still wrapped to have had the opportunity to race.

Sorry about dragging my heels with the photos.  I've still got a few to upload of the bikes out on the salt, but for now here are a few from the event.

Full photo album is available at https://www.facebook.com/suuscustoms/photos_albums
Full writeup at http://suus.com.au/speed-week-2014-suus-gets-two-records/

We also put together a little video:














Suus: Reimagined/Recycled/Upcycled Cool
https://www.facebook.com/suuscustoms

Offline suuscustoms

  • Posts: 193
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #15 on: Mar 18, 2014, 00:23:09 »
And some more:

















Suus: Reimagined/Recycled/Upcycled Cool
https://www.facebook.com/suuscustoms

Offline DesmoBro

  • Posts: 2398
  • Busted Nut
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #16 on: Mar 18, 2014, 01:52:02 »
So F'n Bad
"I desire the things that will destroy me in the end"

Offline bydgoszcz

  • Posts: 78
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #17 on: Mar 18, 2014, 02:08:35 »
That bike looks great! Love the shape of that tank.

Offline JustinLonghorn

  • DTT SUPPORTER
  • *
  • Posts: 6676
  • No Purple Hearts, No Blue Ribbons
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #18 on: Mar 18, 2014, 09:46:21 »
rad!
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline DansMoto73

  • Posts: 1
Re: Yamaha Twinjet YL1 Salt Lake Racer
« Reply #19 on: Jul 25, 2019, 09:47:56 »
I sooo wanted to see all the images in this thread but they are gone :(