Author Topic: Carb rack throttle bushing, my mistake your lesson  (Read 626 times)

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Offline kidrcth

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Carb rack throttle bushing, my mistake your lesson
« on: September 07, 2016, 07:52:48 am »
So as some of you may know the carb rack can be disassembled, a wrong and a right way. It is not very tricky however, I didn't see the right way when I disassembled mine. There is a screwed in set screw that's hidden on one side. You must remove that screw or you will break the bushing much like I did. However I got lucky, after talking to some guys at work, I found or we can make bushings and pretty much anything. We didn't have brass stock in the right sizes however we had aluminum that we've used for bushings before. So we used that.

In the pic you can see the area on the carb rack that must be drilled, and the old broken bushing and the replacement.

Offline flybox1

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Re: Carb rack throttle bushing, my mistake your lesson
« Reply #1 on: September 07, 2016, 07:57:45 am »
So as some of you may know the carb rack can be disassembled, a wrong and a right way.   doesn't need to be fully disassembled to be adequately cleaned.
FTFY  ;D
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline kidrcth

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Re: Carb rack throttle bushing, my mistake your lesson
« Reply #2 on: September 07, 2016, 07:59:59 am »
True, however trying to remove the flaking  chrome from the arms is harder while assembled.
« Last Edit: September 07, 2016, 08:04:01 am by kidrcth »

Offline flybox1

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Re: Carb rack throttle bushing, my mistake your lesson
« Reply #3 on: September 07, 2016, 08:03:13 am »
Nice fix, though  ;)
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline drumstyx

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Re: Carb rack throttle bushing, my mistake your lesson
« Reply #4 on: September 07, 2016, 04:48:33 pm »
I didn't find the carbs particularly difficult to disassemble, though I'm working on a '78, which are rather different from the early ones.

Offline disco

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Re: Carb rack throttle bushing, my mistake your lesson
« Reply #5 on: September 08, 2016, 12:38:23 am »
Thanks this is useful info.
I have a set of carbs that arrived in mail with broken lifter arm, that I now need to replace.
1976 CB750 K6 Sapphire Blue
1972 CB750 K2 836 Orange Sunrise
1972 CB750 K2 Candy Red
1972 CB750 K2 Candy Gold'