Topic: honda cb350f reluctant to pull

[edmer79]

the problem start to happens at around 7000rpm.it got worse when i switch to k&n filters(5500rpm).could it be the carbs?main jets?ignition timing?fuel flow?

[Harry]

Uhm... yes!

[edmer79]

so what do you think is the main problem?

[Harry]

See carb FAQs for description of causes of your symptoms.

[El Taco]

the problem start to happens at around 7000rpm.it got worse when i switch to k&n filters(5500rpm).could it be the carbs?main jets?ignition timing?fuel flow?

Does it only happen at speed? I've heard of people getting poor performance running pods at speed. Otherwise, it never hurts to check your spark advancer. It should move freely and snap back.

[edmer79]

it's happen at about 50mph.the problem starts whenever the throttle is open more than 1/4.maybe the carbs need a bigger main jet in relation to the k&n filter i change.there again the problem still exist even with stock air filter(around 7000rpm).what with happen if i advance or retard the timing?

[edmer79]

by the way,my cb350f is fitted with newtronics electronic ignition.

[don_m]

The stock Honda air filter element is good but very restrictive.  The carburetor main jets are sized to allow for it.  Your symptoms are typical of running without a filter element or running with a foam replacement.  You can go up one jet size to compensate for a free flowing filter.
Don.