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Author Topic: Cleaning the engine cb750 1978  (Read 2937 times)

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Offline briancwynn

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Cleaning the engine cb750 1978
« on: October 03, 2014, 07:59:09 PM »
All, cleaning the engine and getting stuck on the fins. How do you clean them enough to paint them? Grease seems like it cannot be cleaned out! I am not taking the engine apart. 
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Honda CB750 1978 K
Stock Carbs w/ Pods
125 main jets, stock slow, and 2 shims on the needle (equal to about raising it one clip)
M-unit
Bike broken down to bare bones and slowly put back together (except for the engine)

Offline skyline223

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Re: Cleaning the engine cb750 1978
« Reply #1 on: October 03, 2014, 10:36:23 PM »
I used acetone and Q-tips. Can be time consuming but worth the effort.
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Offline Vinhead1957

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Re: Cleaning the engine cb750 1978
« Reply #2 on: October 04, 2014, 04:56:26 AM »
Gunk has a foam cleaner spray on hose off
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Offline Stev-o

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Re: Cleaning the engine cb750 1978
« Reply #3 on: October 04, 2014, 08:47:00 AM »
Quote from: Vinhead1957 on October 04, 2014, 04:56:26 AM
Gunk has a foam cleaner spray...

....and a wire brush is how I did mine.  And clean clean clean before you prime.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline RSchaefer

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Re: Cleaning the engine cb750 1978
« Reply #4 on: October 04, 2014, 11:58:40 AM »
I soda blasted mine and painted.
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Offline briancwynn

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Re: Cleaning the engine cb750 1978
« Reply #5 on: October 06, 2014, 07:33:48 AM »
Qtip and acetone worked.. I thought maybe you were joking like a left handed can opener. It works!  Thanks alk
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Honda CB750 1978 K
Stock Carbs w/ Pods
125 main jets, stock slow, and 2 shims on the needle (equal to about raising it one clip)
M-unit
Bike broken down to bare bones and slowly put back together (except for the engine)

Offline flybox1

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Re: Cleaning the engine cb750 1978
« Reply #6 on: October 06, 2014, 09:02:58 AM »
ZEP Purple Commercial cleaner/de-greaser. 50/50 w/ water in a spray bottle.
an assortment of plastic bristled brushes.  long and short, to get in all the small spots.
rinse with water and then wipe down with acetone.
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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)
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"Knowledge without mileage equals bullsh!t" - Henry Rollins

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Offline evanphi

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Re: Cleaning the engine cb750 1978
« Reply #7 on: October 06, 2014, 09:14:14 AM »
Toothbrushes and your favourite degreaser!
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--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline rb550four

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Re: Cleaning the engine cb750 1978
« Reply #8 on: October 06, 2014, 03:59:25 PM »
I like paint thinner and brass/ stainless brushes, cuts the crud instantly , brushes clean the paint off. Rinse with paint thinner,  shoot  with compressed air. All clean.
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A few Honda 500's, a few Honda 550's, a few Honda 650's, '72 cb 450, a couple 500/550/650 hybrids, and 2001 750. 
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Offline Guido56

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Re: Cleaning the engine cb750 1978
« Reply #9 on: October 07, 2014, 05:13:12 AM »
Steel brushes for weapons and solvent
I'm sorry but I do not have pictures of when I did I
This, however, 'was the result

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Honda four 750 K1
Kawasaki Z1300 A3
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Offline evanphi

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Re: Cleaning the engine cb750 1978
« Reply #10 on: October 07, 2014, 05:43:41 AM »
Quote from: Guido56 on October 07, 2014, 05:13:12 AM
Steel brushes for weapons and solvent
I'm sorry but I do not have pictures of when I did I
This, however, 'was the result



Great idea and excellent results!

Go buy a .30 cal cleaning kit, some solvent, and get to brushing!
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--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline briancwynn

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Re: Cleaning the engine cb750 1978
« Reply #11 on: October 07, 2014, 06:41:53 AM »
Guido what did you put in the carb holes when painting? Did you ball up paper or something or simply cover the holes with tape?
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Honda CB750 1978 K
Stock Carbs w/ Pods
125 main jets, stock slow, and 2 shims on the needle (equal to about raising it one clip)
M-unit
Bike broken down to bare bones and slowly put back together (except for the engine)

Offline flybox1

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Re: Cleaning the engine cb750 1978
« Reply #12 on: October 07, 2014, 07:45:05 AM »
Quote from: briancwynn on October 07, 2014, 06:41:53 AM
Guido what did you put in the carb holes when painting? Did you ball up paper or something or simply cover the holes with tape?
Just mask it well with tape.  Ball up a paper towel first if you're worried.
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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 Guido56

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Re: Cleaning the engine cb750 1978
« Reply #13 on: October 07, 2014, 11:56:51 AM »
Attention, steel brushes, not copper or brass, those leave a layer of material not paintable.
And if you are lazy you can apply to a variable speed drill. get ruined but cost little
The collectors were filled with paper and secured with tape to the bodywork.
Sorry for my English but I'm using the google translator
However, if I can be of help, I'm here
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Honda four 750 K1
Kawasaki Z1300 A3
Benelli TNT1130
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