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Author Topic: CB 750 Carbs ??????  (Read 1372 times)

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10diamond

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CB 750 Carbs ??????
« on: September 13, 2008, 11:56:30 PM »
Got my bike running today! (woo hoo) but It's got some issues in that Carbs. Any Ideas or tips on what to do next? I've fidddled with the air mix screws and idler But I have not hit the sweet spot yet. Any ideas what to try next????? By the way It idles great! but if you crack the throttle open in gear it sputters a lot.
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KingCustomCycles.com

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Re: CB 750 Carbs ??????
« Reply #1 on: September 14, 2008, 03:52:09 AM »
SEARCH  ;)
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Offline Johnie

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Re: CB 750 Carbs ??????
« Reply #2 on: September 14, 2008, 03:19:04 PM »
Search  ;) and sync... ;D  Did you just rebuild those carbs?  What bike are we talking here?
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

10diamond

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Re: CB 750 Carbs ??????
« Reply #3 on: September 15, 2008, 05:29:58 PM »
I didn't "re build" them but I did re-jet and take apart to clean! it's on a 1970 cb750
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KingCustomCycles.com

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Re: CB 750 Carbs ??????
« Reply #4 on: September 15, 2008, 06:26:51 PM »
Adjusting the idle circuit screws and the low throttle stop will do NOTHING to help a set of dirty carbs run better.  Remove the entire rack, clean them like it is your last day on earth, reinstall them, and then set the screws and stop.  Use the search function for endless good advice on carbs.  If you are going to ride a motorcycle with 4 carbureters, you will be an expert when it is all said and done.
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Offline void909

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Re: CB 750 Carbs ??????
« Reply #5 on: September 15, 2008, 11:16:33 PM »
ok im not trying to steal the post but I just got done soaking my carbs in an off the shelf bucket of cleaner and they seem to have a film on them still. What exactly should I be soaking them in to get it good and clean. A friend said the carb bodies might be too old and shot. Can this happen?
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Offline dustyc

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Re: CB 750 Carbs ??????
« Reply #6 on: September 15, 2008, 11:31:49 PM »
Void,
You have to watch soaking them in the Berryman's carb cleaner(maybe others as well).  I left some 550 carbs in for a while(couple hours) and it basically ate into them to the point where they look bad.  I don't think their function will be affected, but I'll be keeping it in mind if anything is weird when I put them on. 

So yours might not be shot, just gonna look bad.  That film should wash off it's the same thing that happened to mine.  I was thinking of doing a blacked out bike and painting mine black to match.
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1977 CB750

Offline BobbyR

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Re: CB 750 Carbs ??????
« Reply #7 on: September 16, 2008, 06:03:30 AM »
Quote from: void909 on September 15, 2008, 11:16:33 PM
ok im not trying to steal the post but I just got done soaking my carbs in an off the shelf bucket of cleaner and they seem to have a film on them still. What exactly should I be soaking them in to get it good and clean. A friend said the carb bodies might be too old and shot. Can this happen?
Try Simple Green. Just plain Simple Green. Best Carb cleaner there is.
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Offline void909

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Re: CB 750 Carbs ??????
« Reply #8 on: September 16, 2008, 06:35:02 PM »
thanks boys Ill try the simple grean
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