Author Topic: throttle valves on 77 hondamatic 750  (Read 621 times)

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Offline devon125

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throttle valves on 77 hondamatic 750
« on: November 08, 2018, 08:05:34 PM »
I am new to the site,  bought a 77 hondamatic which didn't run, but turns over, spark, timing is right, but I am finding most of the problem is in the carburetors..  They were plugged up, the bike sat with old gas for 2 years,  I am finding things that were worked on and not done properly.  Looking at the manual you have on line for this bike, there are supposed to be slots in the throttle valves which must point towards the air filter when installed...article..13-4 in the honda manual,  I cannot see these looking at the intake side of the carburetors,  shouldn't they be visible.  The throttle bodies move up and down free, but can't see any cutaways, is this only on some models, or all should have them... is it possible someone not knowing could have reversed them...

Offline MD

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Re: throttle valves on 77 hondamatic 750
« Reply #1 on: November 09, 2018, 04:08:35 PM »
Welcome from Minnesota

Sorry can't help you with the Carb question.

-MD
1975 CB550F Super Sport;  Lake Superior Circle 1000, 45-90 Saddle 1000, All in Yooper 1000 and SS 2000 in 48 hrs:  1985 GL1200A, MN in State SS1K

Offline 05c50

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Re: throttle valves on 77 hondamatic 750
« Reply #2 on: November 09, 2018, 05:45:14 PM »
Hello and welcome. I believe that you're confusing the "slot" with the "cutaway". The cutaway is a raised area on the bottom of the slide and will be visible when looking into the carb throat, the slot will not be visible. Take a look at this slide image, it may help https://www.ebay.com/itm/77-78-HONDA-CB750F-CB750K-CB750-CB-750-CARBURETOR-THROTTLE-SLIDE-VALVE-83B-/302314561873  Can the slide be installed incorrectly.........anything's possible.

.......Paul
Wear a helmet,the life you save may be your own.Ask me how I know.               CB650C,CB550F,GL1000,CB750A