SOHC.co.uk Forums > CB750

Carbs Install

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K2-K6:
Silicone oil or grease only for the cables, else you'll get problems.

There needs to be enough slack in pull cable such that it doesn't go tight when turning the steering from full lock to opposite. Seems loose in absolute terms, but needed to avoid a conflict between the two cables that will also make throttle action difficult.

Martin6:
Yes, silicone used. I will adjust the lower cable for initial slack. Thanks.

Martin6:
Strange. As soon as I connect the throttle opening cable, the carbs don't close. Also, the return / close cable seems far too short. As soon as it is connected even at its loosest, it is not allowing the throttles to fully close, even manually. There's not enough cable length.

Ive rechecked routing and the bar mechanism. I'll have another look tomorrow, I may be adjusting it all wrong. I've ordered new cables anway.

So, that was the dull bit. I was naughty and removed the return cable and went for a short ride. Fantastic. Handles better than I expected, sounds great. The bike is starting, ticking over, running on all 4. Idle below 1500rpm is lumpy but smooth above that and I sense it wants to pull more at 4-5,000rpm. Pretty sure a carb tune would sort it. However, the rear brake pulses badly. So that's next on the list  ::)

Nurse Julie:
Is your K6 a UK model with lower handlebars or a USA model with the high bars? Have you got a photo of the bike?

Martin6:
It's a UK bike. Registered June 1977. K6 engine and frame numbers. Lower UK bars. The standard cables should work.

At the bar end, the throttle tube looks old, but undamaged. It rolls smoothly.

I think the gantry is ok. At the gantry end the max slide lift is about right (just under 33mm) and the 'overcross stop adjustment' is in spec at about 3mm. The springs are strong and look fine.

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