airbox issue

[Mafiera]

Hi
I Have a 1977 GS750
I have been having problems
No power over 5000 revs under load just starts cutting out
Thought it might be carbs or airbox issue so put my mates airbox carbs and tank on mine and put mine on his
Both ran like a dream
Swapped them back over and still had same issue
Swapped his airbox for mine
Ran like a dream
Cleaned my air filter re oiled it
Still same issue
Someone tell me I'm not going mad
Help would be great
Thanks
Marco

 

[timebombprod]

Hi
I Have a 1977 GS750
I have been having problems
No power over 5000 revs under load just starts cutting out
Thought it might be carbs or airbox issue so put my mates airbox carbs and tank on mine and put mine on his
Both ran like a dream
Swapped them back over and still had same issue
Swapped his airbox for mine
Ran like a dream
Cleaned my air filter re oiled it
Still same issue
Someone tell me I'm not going mad
Help would be great
Thanks
Marco

Have you inspected both airboxes and found anything different?

 

[Mafiera]

Not we can see

 

[timebombprod]

Any difference in how your bikes are tuned? Exhaust, jetting?

 

[rphillips]

didn't see where you mentioned it, but what if you swap just the air filters? Filters could easily make a difference, don't see it for the actual box.

 

[gs11ezrydr]

Have you inspected both airboxes and found anything different?

1977 do you still have points ...If so your problems might begin there hard to distinguish, at times...Good Luck..

 

[Guest]

Lots of times ignition-related problems masquerade as carb problems. Ditto on gs11ezyrydr: check and replace your plugs, point set up (if you still have points), etc.

It sounds like your buddy's bike runs great, even when it is using all the carb/intake parts from YOUR bike - is that correct? If so, that suggests that the carb/intake parts aren't the problem.

Good luck and keep us posted, and ask if you have more questions!