Vintage and Classic Hondas

carb holder clamps

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Buster

carb holder clamps

I've got a 1972 honda cb750k2. I'm using a good quality 1/2 inch wide hose clamp on the carb holders. When I attempt to sych the carbs, I can only get 10 inches of vacume at idle, and that's with the adjusting screws all the way to the top. The idle is also erratic, RPM up and down. Could the hose clamps I'm using be the cause of the problem. The OEM are much more narrow (about half the size of the clamps I'm using now)? I think maybe I'm not getting a good seal.

TOOLS1

Re: carb holder clamps

Administrator

Welcome to the forum. It does sound like, you are not getting a good seal. However I have known of hose clamps being used with out any problems. Have, you checked the rubber boots? They might be cracked, or hard and not sealing.
TOOLS

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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

MarkPBG

Re: carb holder clamps

I wonder, would it be ok to use a non-voc sealing agent such as silicone grease? i know I wouldn't use RTV or anything like that. I also know with good condition flexible boots, it wouldn't be needed at all.

Mark Davis
Palm Beach Gardens, FL
amateur photographer, hot rodder, motorcyclist, adventurer
"Four wheels move the body. Two wheels move the soul."

Buster

Re: carb holder clamps

In reply to this post by TOOLS1

it's got new boots.

seestheday

Re: carb holder clamps

Are you sure the boots are the right ones? Do they fit loose?

Mine are super tight and its fairly difficult to slide the carbs into them, almost impossible without using soap as a lube. Mine are old and hard though.

1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals

My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.

Piute

Re: carb holder clamps

In reply to this post by Buster

Just a quote from THE MAN
"Just curious. Why do you need the rubber boots? These things hardly ever go bad, and if they get hard they can be softened with wintergreen. "
TOOLS

Wintergreen makes your shop x-mas fresh at no extra charge

I used some S.S. clamps also,YOU need to be sure that were the tightening screw is that it don't push up against anything on the other end,Was(tricky) just barely enough room for mine but does work.

Put a Lil blue r/v on this crack sealed all just fine....Piute...

1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS>
Native American from central Cal, Kickstand UP in S.W.Missouri,