SOHC.co.uk Forums > CB750
re-jetting needed?
El__burro:
UPDATE
Plug 4 reads ok while the other 3 are fouled with carbon. all carbs needles are set up the same way and synced. After a 10 minutes ride i have notice that when i play with the fuel tap (on/res) it goes slightly better. It struggles at low rpm but when it reaches the second part of the throttle it pulls much more. Not sure if it is my imagination or there is a logic behind this. I have fitted the plugs DR8ES L and it goes "slightly" better.
Thanks
el__burro
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El__burro:
Again,i have synced the carbs with the same air mix screw turns, (1and 1/2) carbs sync almost perfect. Still plug 1,2 and 3 are quite black with carbon deposit, number 4 i think looks ok.
DO I set the other 3 carbs air mix screw to a different setting?
Thanks
el__burro
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K2-K6:
It looks to me like you've got both resisted plugs and caps in use there at the same time ( correct me if wrong).Ordinarily it would be one or the other.
These engines are just not that fickle to get running well so it does seem that something odd is present to prevent a logical path through what's in front of you.
In answer to the idle air screws setting, Honda setup instructions do allow for differences between each carb. They go through a routine of getting the lower speed mixture the same for each one although they shouldn't in reality end up with any hugely odd set points as that would suggest some impairment of that particular circuit.
El__burro:
k2-k6 you are correct, i am heading to Halfords tomorrow to see if i can find either a set of plug caps or a set of plugs with no R.
Thanks
el__burro
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Johnwebley:
--- Quote from: El__burro on August 08, 2017, 12:12:11 AM ---k2-k6 you are correct, i am heading to Halfords tomorrow to see if i can find either a set of plug caps or a set of plugs with no R.
Thanks
el__burro
Sent from my SM-G935F using Tapatalk
--- End quote ---
can I suggest you try fleabay and/or amazon,both should be way cheaper than Halfords,
also more likely to be the correct items
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