SOHC.co.uk Forums > CB750
re-jetting needed?
El__burro:
After swapping the spark plugs for NGK D8EA I've seen a tiny improvement. Still Plug 4 is perfect (almost too lean) while the other 3 still a bit carbon fouled (less than with previous plugs) but at least the same colour.
Needle clip is at the bottom but bike still struggles in the mid part of throttle.
In the meantime i have re adjusted the timing.
Thanks
el__burro
Johnwebley:
--- Quote from: El__burro on August 11, 2017, 09:21:42 PM ---After swapping the spark plugs for NGK D8EA I've seen a tiny improvement. Still Plug 4 is perfect (almost too lean) while the other 3 still a bit carbon fouled (less than with previous plugs) but at least the same colour.
Needle clip is at the bottom but bike still struggles in the mid part of throttle.
In the meantime i have re adjusted the timing.
Thanks
el__burro
--- End quote ---
the needle clip at the bottom? is that the lowest groove? that would give a rich mid-range,,try fitting it either in the middle groove,or
second from the top ,
that should clean up the middle range
El__burro:
--- Quote from: Johnwebley on August 11, 2017, 10:43:21 PM ---
--- Quote from: El__burro on August 11, 2017, 09:21:42 PM ---After swapping the spark plugs for NGK D8EA I've seen a tiny improvement. Still Plug 4 is perfect (almost too lean) while the other 3 still a bit carbon fouled (less than with previous plugs) but at least the same colour.
Needle clip is at the bottom but bike still struggles in the mid part of throttle.
In the meantime i have re adjusted the timing.
Thanks
el__burro
--- End quote ---
the needle clip at the bottom? is that the lowest groove? that would give a rich mid-range,,try fitting it either in the middle groove,or
second from the top ,
that should clean up the middle range
--- End quote ---
Will do tomorrow.
Thanks a lot
el__burro
Sent from my SM-G935F using Tapatalk
sprinta:
Are your air screws the solid type or the ones with holes in?
JamesH:
My advice would be fit a standard airbox, go back to stock 110 main jets, setup and re-sync the carbs and get the bike running properly on a baseline intake setup. Then if you really need to go back to pods at least you know you have a solid baseline. You're playing with too many unknown variables and a lack of experience to converge on a solution with your current approach. Just my opinion...
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