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Author Topic: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn  (Read 984 times)

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Offline zeech

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Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« on: September 25, 2013, 11:43:07 AM »
Why did I happen to buy the only CB750 with a set of carbs that is nearly impossible to find reasonably priced rebuild kits or parts for? If you can even find them, it seems the PD 42B carb components are priced so high, and the kits never match what I even have...

I'm also trying to find a 120ish main jet for this model which has the emulsifier tube (or whatever it's called) and that's proving difficult as well.

Can anyone help a noob out? Thank God for SOHC Forums.
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Offline flybox1

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #1 on: September 25, 2013, 11:44:08 AM »
siriusconinc.com has the 120's
i got mine from them. 
part # KHM-110120
« Last Edit: September 25, 2013, 11:45:57 AM by flybox1 »
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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

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 BillyC

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #2 on: September 25, 2013, 11:57:35 AM »
Quote from: zeech on September 25, 2013, 11:43:07 AM
I'm also trying to find a 120ish main jet for this model which has the emulsifier tube (or whatever it's called)

I could hook you up with new 120 main jets, got them in stock. Probably not on the emulsifier tubes. You can clean and reuse the old tubes if they are not damaged. Or supply pics and I have a parts rack that may match up on the tubes.
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Offline zeech

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #3 on: September 25, 2013, 11:58:11 AM »
The's the thing, my carbs don't take that kind of jet... My main jets are the long ones with the emulsifier holes. Will try and find a photo.
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Offline flybox1

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #4 on: September 25, 2013, 11:59:09 AM »
HEY ZEECH...screw the jet out of the emulsifier tube!!!!!!!!  ::) ;D
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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

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 zeech

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #5 on: September 25, 2013, 12:03:09 PM »
LOL.... Truth @flybox? When I unscrew it, the entire thing comes out... maybe it's seized up to the emulsifier tube? It seems like they are a single piece but I am hoping to be wrong and that's the case.
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Offline flybox1

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #6 on: September 25, 2013, 12:09:58 PM »
siezed together...most likely.  just grab the emulsion tube with your crescent wrench just below the jet, and stick a flat head screwdriver in the jet and twist it out. :)
it aint unicorn surgery  ;) :P
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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

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 750K

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #7 on: September 25, 2013, 12:59:48 PM »
What fly said, it's a two piece. The jet just hasn't been removed in ages I'll bet, you can get new oem gaskets and orings from Honda at a reasonable price from what I remember.
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77 Cb750, 78 Kz1000

Offline zeech

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #8 on: September 25, 2013, 01:13:41 PM »
Either way, is there no cheaper place for parts etc? I'm seeing kits costing around $40+ each. I'll check Honda.
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Offline flybox1

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #9 on: September 25, 2013, 01:28:03 PM »
these bikes arent the cheapest to get right and back on the road, but good carb parts are suggested.  they are a one and done purchase. 
What exactly are you needing?
main jets($25), maybe pilots($25), bowl orings all around ($20), new float valves($30), and accel pump kit...
reuse needles, needle jets, mixture screw, drain screw...
probably $120+/-
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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

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 andrewk

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #10 on: September 25, 2013, 03:17:29 PM »
I would avoid most aftermarket parts if you want "no mess" carburetion.  OEM gasket kits can be had for around 15, float valves are kind of pricey at around 20 ea... accel pump diaphragm is a butt-clencher, 50 bucks or better!  But, I've got a couple K&L replacements that don't work, they were 25 each, and the return policy through online vendors makes the time required to return a wash for the money.  Still had to buy an OEM one on top of that!  Lessons learned...

I'm really not an elitist about OEM parts, and I don't like overpaying for parts either- but if you want to ride your bike and quit dicking with carbs every 3-5k miles, buy the good stuff once.  Save your scratch, buy good parts, and have a bike you can really enjoy.   
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Offline Hasenkopf

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #11 on: September 25, 2013, 03:48:24 PM »
AMEN to that !!
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Offline 750K

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #12 on: September 25, 2013, 04:28:59 PM »
Honestly, I don't think the price of oem kits is that bad, you get what you pay for sometimes.
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77 Cb750, 78 Kz1000

Offline zeech

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Re: Cheaper 1978 CB750K Carb Kits; They're Like a Unicorn
« Reply #13 on: September 26, 2013, 12:44:57 AM »
Quote from: flybox1 on September 25, 2013, 11:59:09 AM
HEY ZEECH...screw the jet out of the emulsifier tube!!!!!!!!  ::) ;D

WINNER!!!!

Man, these things were really seized in there. Bike has sat for a few years and were fully locked up. Thanks for the help.

Thanks to everyone else as well, was able to track down some good stuff.
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