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Acceleration problems

J

JohnC

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Hi All

Please help if you can, I have just joined the forum so apologies if this has been dealt with before.

1980 CB750F DOHC
Starts easily. Has good compression. Idles well.

Initial acceleration at minimal throttle is good, but as soon as you open the throttle wide. Engine stuttering and holds back.

The guy I bought the bike from removed the standard airfilter and replaced it with 4 pods.
He started the project I have finished it. He told me that before he started modifying it, " it ran well" not sure though.

Any advice will be greatly appreciated.

Kind regards
John
 
If you read through this and every other forum that has info on these DOHC CB750's, you will find story after story of people trying to get pod filters to work with the stock carburetors and failing. They will never, ever, ever run as well as stock without permanent modification like drilling the slides.

Somewhere deep in this forum years ago, one very nice man even did a dyno test to measure horsepower output. Even "properly tuned" pods make less power than stock.

If you want to change the intake system, you have to change the carburetors. Every few months someone else figures that out the hard way.
 
SenseAmidMadness said:
If you read through this and every other forum that has info on these DOHC CB750's, you will find story after story of people trying to get pod filters to work with the stock carburetors and failing. They will never, ever, ever run as well as stock without permanent modification like drilling the slides.

Somewhere deep in this forum years ago, one very nice man even did a dyno test to measure horsepower output. Even "properly tuned" pods make less power than stock.

If you want to change the intake system, you have to change the carburetors. Every few months someone else figures that out the hard way.
Click to expand...

All this is true without a doubt, but it's a damn shame, because the pods really look so much nicer than the stock air box.
 
Sometimes its also the way the pods fit to the carb mouth...not unusual for the rubber to obstruct flow...sometimes rectified by careful shaving of the inner surface...of the rubber spiggot not the carb.

But agree with the above posts.. re pods generally....if you go thro historical posts many experienced issues with Std carbs...
 
Last edited:
Notwithstanding the looks, which I agree to, my experience gives me that the pods at least on the inline 4, 4 stroke carburated engines is a a fine balance of airflow that can only be correctly adjusted by a fuel injection system.

Shon Ton
 
EPA strikes again. DOHC are all lean burn engines. Too much air with pods & no bigger jets around as I understand it. Drilling them yourself in increments takes a lot of time & patience, & still may not work right. Same issue with exhaust changes, but not as bad.
 

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