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YB8 Builds
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Joined: 10 Nov 2010
Posts: 350
Location: Melbourne Australia

PostPosted: Mon Nov 12, 2018 10:34 am    Post subject: Reply with quote

a bit of an update.... The bike is coming to completion. It is now running, it's been an epic job.

For example you can't route the exup cables unless you put them in place prior to installing the swingarm. Rolling Eyes

Tomorrow I will wash up the seat unit and install it, and that will be that part buttoned up.

Here is a novel way of dealing with the YB carb balancing problem. traditionally I would just used a Yamaha FZR1000 or the like, but didn't have one here atm. I can't recommend the Morgan Carbtune 2 carb balancing tool highly enough. It is a sensationally thought out and engineered product.

https://www.carbtune.com/

So an industrial vacuum cleaner some plumbing fittings and and radiator hose. The industrial vacuum only just pulled enough volume for this to work, however, I intend to use a mains power weed blower in reverse to solve the problem.

I know this system will not take into account an engine that has wildly differing compression, but in this case with a healthy engine with compression within 5 psi it achieved the goal, and the motor runs sweet!

Cheers!



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who



Joined: 10 Nov 2010
Posts: 350
Location: Melbourne Australia

PostPosted: Sat Nov 17, 2018 12:38 am    Post subject: Reply with quote

Okay... this one is finished took it for a ride, and bloody hell!

It's the first bike I've ridden with an exup valve fitted, and it makes a very noticeable difference the engines character, especially how it pulls from low rpm.

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