SOHC.co.uk Forums > CB750

pd41 carb problem

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legin101:
Hi all can anyone tell me what i have done wrong she starts good idles reasonably well and picks up speed through the gears, not as quickly as i feel she should but when i ask it to go past 5 or 6 thou it bogs down. the carbs have been in the ultrasonic bath so reasonably clean, but what i have noticed is the pump isnt although ive had it to bits and cleaned it. any ideas, at a stand still it revs really well and returns to idle it timed to the "F" at around 1000 rpm.

nigel >:(       

K2-K6:
Do you mean that the accelerator pump has no output? as I didn't quite understand the bit about cleaning it.

legin101:
i do have a feeling it still after cleaning the pump its top and lower ball valves etc still not squirting fuel, so i don't think they are working i think they are coming off i must have missed something. getting to the output of those pump outlets is a nightmare, do they push out?

cheers

nigel 

K2-K6:
http://forums.sohc4.net/index.php/topic,146893.0.html

Above Link may help on the USA site if you've not seen it already.

It definitely needs the pump to make it GO! The "static" jetting on these is close to optimum for clean running and power,  but the addition made by the pump in acceleration phase is fundamental to their strategy. 
Non pumped carbs just do this by running excess mixture generally, in effect slightly too rich.

legin101:
Thank you i am about to strip them down. see how i get on what is your take on pods ? do i need to ut the damn box back on?

nigel

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