Author Topic: 1969 CB750 carbs transplant  (Read 2517 times)

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Offline lucky

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1969 CB750 carbs transplant
« on: June 22, 2012, 02:28:58 pm »
I found out that a 1972 carb mount plate will fit the 1969 carbs with
very little modification. I bought carbs that did not have the mount plate and I have seen several other photos of broken carb mount plates for the 1969 carbs.

I also found out that the 1969 carbs will fit the 1978 carb mount boots by
just tightening the clamps down. There was a .060 difference.

The 1978 carb mount boots are shorter than the 1976's.

BTW...I put the 1969 carbs on my 1978 CB750 and now it runs great with perfect throttle response from idle.
I have #120 mains #40 idle jets and clip on the middle notch. Otherwise stock for those carbs. Mixture screws out 3/4 turn.
Good results on the road test. Accelerates hard and just keeps accelerating at WOT.

The mixture screws are very sensitive to adjustment- they really respond. 1/8 turn makes a difference between backfiring on decell or NOT backfiring on decell.

« Last Edit: August 31, 2012, 10:03:46 pm by lucky »

Offline slyguy

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Re: 1969 CB750 carbs transplant
« Reply #1 on: November 22, 2012, 06:42:27 am »
Wow great! I also have 69 carbs with a broken plate..:( plate #16273-300-001

Offline MoMo

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Re: 1969 CB750 carbs transplant
« Reply #2 on: November 22, 2012, 07:28:03 am »
I just had a broken plate tig welded by a local Amish shop...Larry

Present: 1974 CB750, 1975 CB400f  , 1991 GS1100 Suzuki Katana, 1991 Kawasaki Ninja 600,  1982 Yamaha Seca 400, 1974 BMW R90/6, 1982 Kawasaki LTD KZ1000K2
Past: Two Honda XL125s )(I rode one in enduros), Honda XL175, Yamaha DT1, MZ 250 ISDT, Harley Hummer, 1969 Honda CB350, 125 Sachs/DKW, 250 Ossa Pioneer, 1968 250 Montesa La Cross, Yamaha RD350, two Yamaha TX500, eight Honda CB450 dohc, 250 KTM, 1982 Yamaha 650 four, eight Honda CB400f's, 1983 Honda VF750F Interceptor, 1981 CB650, 1973 CB350G, two 1973 CB750s, mint 1975 Honda CB550F, two 1977 CB750K7s , two GL500I Silverwings, 1973 Jawa 175 Trailmaster, SL350 K2, 1970 CB750K0, 1972 CB350, 1974 CZ 250 Enduro, 1966 Suzuki S32 150cc , 1975 CB750K,  1984 Honda Sabre V4 , 1965 Triumph 650. 1989 Kawasaki Ninja 600, 1998 Honda Pacific Coast, 1994 Kawasaki Concours and  probably others long forgotten( a Puch (Puke) 125.

 

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