Keihin CRS throttle bracket clearance

jseng1 · Jul 27, 2020

I'm redesigning the throttle cable bracket and wheel location of Keihin CRS smoothbore carbs for Nortons. Those who have them on their Nortons - please check the photos below and tell me if the square throttle bar will clear the tank. Note that it is level with the heigth of the idle screw/plate and protrudes about 1/4" from the end of the throttle shaft. (I don't have a Commando on hand to check - just a featherbed).

maylar · Jul 27, 2020

Can you add some dimensions to that?

jseng1 · Jul 27, 2020

maylar said:
Can you add some dimensions to that?

The alum bar extends 5/8" outward from the center of the idle screw to within 1/4" of the end of the shaft. The top of the bar is even with the height of the idle screw head. You need to have my 1st version of these carbs installed to check the bar clearance to the tank.

koda · Jul 28, 2020

jseng1 said:
The alum bar extends 5/8" outward from the center of the idle screw to within 1/4" of the end of the shaft. The top of the bar is even with the height of the idle screw head. You need to have my 1st version of these carbs installed to check the bar clearance to the tank.
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koda · Jul 28, 2020

jseng1 said:
The alum bar extends 5/8" outward from the center of the idle screw to within 1/4" of the end of the shaft. The top of the bar is even with the height of the idle screw head. You need to have my 1st version of these carbs installed to check the bar clearance to the tank.

I just got mine put back together I have one of the first sets you made. Let me take a look when I get home

Brooking 850 · Jul 28, 2020

Jim are you still selling these carb sets?
Regards Mike

Ctefeh · Jul 29, 2020

I'll ask that question as well....something to save for

Sean

jseng1 · Jul 29, 2020

Mike and Sean

I quit selling them for a few years but people have been asking so I'm working on firing them up again if I can do it without so much labor converting them to fit commandos. Having manifolds made now and waiting for confirmation on the cable bracket clearance.

Brooking 850 · Jul 29, 2020

Thanks Jim

koda · Jul 30, 2020

Hey Jim just put the tank back on and yes I believe your redesign will clear

jseng1 · Jul 31, 2020

What if the cable housing went straight forward from the top of the wheel as in the photo? Would it clear the petcock - if so by how much?

jseng1 · Aug 2, 2020

Some one please tell me if the right end of the throttle shaft would clear the petcock if a line was drawn forward from the end of the shaft?

Matchless · Aug 3, 2020

With Interstate tank the petrol tap is 1.375" forward of the spindle centre line, & from the end of the spindle is also 1.375" to the back of the tap (standard Ewarts type)

Martyn.

jseng1 · Aug 3, 2020

On all Commandos is there at least 1/4" sideways clearance from the end of the throttle shaft to the petcock as shown below. Photo below shows 3/8" sideways clearance.

Keihin CRS throttle bracket clearance

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