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Author Topic: 1980 cb750 help please!  (Read 963 times)

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Offline oldschoolrides

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1980 cb750 help please!
« on: March 10, 2016, 05:42:00 PM »
So I'm trying to help my buddy get his DOHC running. He has all the carbs rebuilt an jetted for his exhaust. How ever cylinder number 1 will only fire if you cover 3/4 of the carb air intake... I've not seen this before. Any tips? Jets are 110 mains 75 secondary and 30 idle.

Thanks for any info.
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Offline eigenvector

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Re: 1980 cb750 help please!
« Reply #1 on: March 10, 2016, 05:47:02 PM »
Mind you I'm assuming you have the VB42 carbs here...

I'm still guessing that the pilot jet is plugged up.  Be amazed how difficult it is to unplug that circuit.  Might also try the anti-backfire circuit.
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Rob
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2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline oldschoolrides

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Re: 1980 cb750 help please!
« Reply #2 on: March 10, 2016, 05:53:49 PM »
Quote from: eigenvector on March 10, 2016, 05:47:02 PM
Mind you I'm assuming you have the VB42 carbs here...

I'm still guessing that the pilot jet is plugged up.  Be amazed how difficult it is to unplug that circuit.  Might also try the anti-backfire circuit.

Yes have to check that out! I forgot about the backfire circuit. The VB42 are treat to get clean. .....
....


your a bad ass that was it! thanks! 4 four are banging away! Thanks!
« Last Edit: March 10, 2016, 05:56:05 PM by oldschoolrides »
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