SOHC.co.uk Forums > CB750
Idle and Starting Set Up
Bryanj:
There is a spring in the float valve and if it doesn't work you need new valves. Having done these foe years I would say the job for an inexperienced mechanic is impossible on the bike and few experienced ones will try it
mgy66:
Humm, I guess you are suggesting riding the bike to a professional mechanic for a complete rebuild of carbs... I will check with my mechanic what would be the charge.
Thanks,
Marc
hairygit:
I think what Bryan means is that trying to change the float valves with the carbs on the bike is impossible for the average home mechanic, with the carbs on the bench, it's straightforward and easy, so get the carbs off and sort it!
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Bryanj:
I meant setting the float height but was tired when I wrote it, either way easy with carbs off, damn near impossible with them on
mgy66:
Got it!
Carbs dismantled, 1.3L ultrasonic/heater cleaner on the way. Will probably use some dish hand washing detergent. Meanwhile, inventoring of spare parts I need, incl. trying to unscrew the damn needle to check size and pin position (I think it is 1 below the top one currently). I can tell you that I am not the first to unscrew these needles. Screw heads are worn...
Need to check whether it is also the right needle (it is a conic one). I have confirmation that no spring in the float valve. Would need to resupply the spring but I also want to check Haynes picture of the carbs to double check whether there is one. If I add a spring and OE do not have one by construction, then the 26mm may not be the right target as I would need more immersion to push the floats and close the valves.
Question around keeping some gaskets, seals and rings. Some are marked but overall they seem ok...
Main goal is to solve the start up/1000rpm idle, i.e. make sure I have good flow in the slow chambers of the carbs...
I am sure I will come back for further advices as I progress in the clean-up.
I am sure I will come back for more advices as I progress...
Thanks,
Marc
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