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Author Topic: 1977 cb750f carb question  (Read 1146 times)

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Offline Mafia

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1977 cb750f carb question
« on: December 02, 2013, 03:38:16 PM »
Seen many videos of different carb rebuilds and notice that slides should move up and come back down fairly easy. My carbs pd44a I beleive have stuck slides.there's a large spring and I'm wondering if they need to be functioning on the bike in order for the slides to move. Just don't want to force them. So question is... should  be able to move those slides with my finger?
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Offline zekd

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Re: 1977 cb750f carb question
« Reply #1 on: December 02, 2013, 05:08:04 PM »
Detach the spring for the carb assembly. Then you should be able to slide them freely. Don't force anything!
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Offline Mafia

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Re: 1977 cb750f carb question
« Reply #2 on: December 02, 2013, 05:53:11 PM »
So that spring is holding them down.wasn't familiar with that type of carb set up. Don't have the carbs in front of meis that a simple procedure,  removing that spring?
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Offline Mafia

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Re: 1977 cb750f carb question
« Reply #3 on: December 03, 2013, 10:08:39 AM »
Does anyone have an exploded diagram of thee pd44a?
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Offline flybox1

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Re: 1977 cb750f carb question
« Reply #4 on: December 03, 2013, 12:47:04 PM »
why remove the spring?  if you actuate the throttle bell, do the slides lift?
if they do, the spring should snap them back down. 
if they dont snap back down, remove the slides through the top caps for a clean and replace.
if the slides are gummed up, surely the rest of the carb passages are.
time for a thorough cleaning....
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'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

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1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline Mafia

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Re: 1977 cb750f carb question
« Reply #5 on: December 03, 2013, 01:16:28 PM »
Ok good info.gonna have to break em down to loose the slides.and no actuating thr throttle does not lift them.
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Offline cheftuskey121

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Re: 1977 cb750f carb question
« Reply #6 on: December 03, 2013, 01:25:02 PM »
yeah they are gummed (rusted) shut. my K1 carbs were like this. I had no clue either. I applied lots of PB blaster to the slides as I was taking the bank apart and then used a heat gun to add some heat. you should be able to get them loose. I pryed them upwards from the gap that was already present. be careful not to gouge anything though! good luck. after you get them out you can hit the inside of the carb body with some steel wool to do a light "hone". same with the slides. so you make sure they are clean and will slide properly. not trying to remove material, just reduce friction.
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Offline Mafia

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Re: 1977 cb750f carb question
« Reply #7 on: December 03, 2013, 02:18:33 PM »
Heat and slight pressure seem to be the ticket. Def didn't wanna force anything.ty everyone for the great help.no just have to figure out how to remove the slides once I free them up.will probably use brass brush for the "hone" you speaketh of.
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