Author Topic: Fitting round tops on later engine.  (Read 762 times)

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Offline jakec

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Fitting round tops on later engine.
« on: October 19, 2020, 12:27:15 PM »
I have round top carbs off a 72. I have a 77 engine. Can I use the boots from the 72 to install the carbs? The intake ports on the 77 engine are larger. Just wanted to ask before I try and force them on.
1970 CB750 K0
1977 CB750 Chop
1984 Big Twin Evo Chop
1997 XR650L

Offline grcamna2

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Re: Fitting round tops on later engine.
« Reply #1 on: October 19, 2020, 05:15:01 PM »
subscribed.I want to know also  ;)
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Offline seanbarney41

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Re: Fitting round tops on later engine.
« Reply #2 on: October 19, 2020, 07:01:06 PM »
yeah, I know it works.  Use the 70-76 boots.  It may be necessary to carve them out slightly with a flapper wheel on a die grinder or something.  I don't think so though, just good, soft, fresh boots with a heat gun and some grease.
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Offline 754

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Re: Fitting round tops on later engine.
« Reply #3 on: October 19, 2020, 07:04:17 PM »
 I lubed mine up and they twisted on, they were not real soft , but somewhat flexible. .
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Offline jakec

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Re: Fitting round tops on later engine.
« Reply #4 on: October 20, 2020, 01:11:18 AM »
I used my ‘72 boots, just needed a heat gun and they went right in.
1970 CB750 K0
1977 CB750 Chop
1984 Big Twin Evo Chop
1997 XR650L

Offline Alan F.

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Re: Fitting round tops on later engine.
« Reply #5 on: October 20, 2020, 04:53:02 PM »
Thanks, good info.