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Author Topic: Project CB690 (KTM 690 engine in a CB550f frame)  (Read 5063 times)

Offline JustinLonghorn

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Re: Project CB690 (KTM 690 engine in a CB550f frame)
« Reply #70 on: Jun 19, 2018, 08:42:21 »
Righteous work so far.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline Popeye SXM

  • Posts: 114
  • Also used for MX
Re: Project CB690 (KTM 690 engine in a CB550f frame)
« Reply #71 on: Jun 19, 2018, 09:54:34 »
I like it. Moving the SA pivot forward and using the KTM SA is a good solution, keeps the pivot point close to the sprocket. I think the KTM SA looks great too

Offline goodoltup

  • Posts: 41
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Re: Project CB690 (KTM 690 engine in a CB550f frame)
« Reply #72 on: Jul 08, 2018, 13:55:20 »
I took the forks apart in preparation for shortening. Minor panic as for a couple of days I thought that they could not be disassembled far enough to replace the topout spring, but after searching the internet for pictures I did notice that there was a hidden snap ring that allowed them to come apart. I will be ordering a spring kit that shortens the forks but maintains the correct spring rate. Also new seal kit, of course.

Offline goodoltup

  • Posts: 41
    • Personal and Work Website
Re: Project CB690 (KTM 690 engine in a CB550f frame)
« Reply #73 on: Jul 08, 2018, 14:00:58 »
Finished mocking up the tube and the motor mounts. The left motor mount is shaped so that it matches the shape of the stock sprocket cover. The right side one looks more like a simple triangle. The swingarm mounts will be made in 10mm plate, the front motor mounts in 6mm plate, all waterjet. The tube will be formed by a specialist mandrel bending company.
Also, I bought a cb550 tank. I like the gt550 tank better, but it would need tunnel modification in order for it to fit, and in order to keep this project running I thought it would be a good idea to minimise unknowns and potential problems as much as possible. I will keep the gt550 tank and maybe add it later for version 2.

Offline goodoltup

  • Posts: 41
    • Personal and Work Website
Re: Project CB690 (KTM 690 engine in a CB550f frame)
« Reply #74 on: Jul 08, 2018, 14:03:17 »
My manager gave me an engineering drawing of an automatic transmission. It has hand written notes and a date from 1968. I'm very thankful, it makes a nice addition to the garage.