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Offline Mafia

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carb fitting
« on: February 01, 2014, 09:22:48 AM »
Noob question. Upon mounting my carbs I feel like they are not going on far enough.it feels like they seat bit there is a gap between the carb body and the boot. My rubber is good and I have applied constant equal pressure by using rope. I see the groove on yhe carb but the space is bugging me.should they be flush against the carb body? 1977 cb750 f2 with pd carbs.
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Offline martin99

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Re: carb fitting
« Reply #1 on: February 01, 2014, 12:53:04 PM »
Talking about the airbox side? The rubbers don't go right up against the carb body, they just butt up to the ridge around the inlet. If you're talking engine side, then yes the rubbers should be tight up against the backplate.
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Offline Don R

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Re: carb fitting
« Reply #2 on: February 02, 2014, 07:12:11 PM »
Put a 2x4 across the face of the carbs, insert a pry bar through the notch in the frame using something soft at the pivot point, above the 2x4. Pry against the 2x4 moving from side to side until the carbs pop on. Buy new carb rubbers too if you can.

This belongs in the tech section.
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Offline Mafia

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Re: carb fitting
« Reply #3 on: February 02, 2014, 07:13:22 PM »
Rgr.ty
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Offline Bankerdanny

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Re: carb fitting
« Reply #4 on: February 03, 2014, 03:25:23 PM »
Heat and a little bit of lithium grease are your friends here. Use a hair dryer to warm up the rubber right before the install, it will make the rubber much more pliable. I also use a very thin smear of grease on the inside of the boots.

If you are part way there just use the heat to soften. You should feel the boots pop into place on the manifolds and carbs.
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Offline LesterPiglet

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Re: carb fitting
« Reply #5 on: February 03, 2014, 03:28:28 PM »
A picture may help us to help you.  ;)
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Offline Mafia

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Re: carb fitting
« Reply #6 on: February 03, 2014, 03:30:24 PM »
Lil heat did the trick thanx a lot everyone. Easier than I thought once the heat was on!
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