SOHC.co.uk Forums > CB350/400

Carbs got to come off again

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Johnwebley:
Use the bike regularly

With the sun we have now

No excuse

3 or 4 good rides a week

About 50 miles each

Should be able to get 2 rides per tank full

The running, vibration etc will help all the new parts to settle in

After all the hard work, you deserve to get out and enjoy

Sent from my SM-A546E using Tapatalk

Ken4004:
Thats exactly what I had in mind for this week , another hundred miles and I’ll should have 500 miles on the clock since the rebuild so probably changed the oil and filter then back on the road.

Thanks everyone for your advice and support which is much appreciated.

Regards Ken

K2-K6:
It should be much more responsive now, running fully on all four cylinders if all anomalies corrected.

These, smallest capacity four, have remarkable ability to mask quite significant combustion problems to those unaccustomed to them. Even if you are very close, adjusting the timing for example, they don't broadcast much in way of problems that may be internally troubling the clean running.

The engineering integrity of bottom end, barrels and head, in casting size and rigidity, keeps them very quite even with very poor running.  They soldier on remarkably with all sort of problems in firing.

Should be a lot more eager to spin easily now, then to give a better ride and heat management for the combustion. 

Hopefully, it'll positively sing along now.

The oil will likely show a measure of fuel dilution after running on three cylinders intermittently, a change probably good from that aspect along with other running in consideration.

Mikep328:
Do a few runs to exercise that motor!  (the stuttering you will hear as the speed increases  is microphone wind noise, NOT engine misfiring) https://www.youtube.com/watch?v=OrGVaO3ogaE

Ken4004:

--- Quote from: exvalvesetdabbler on June 17, 2026, 08:16:05 PM ---Leave it in.  I do put about 3 spots of engine oil per 300 ml.. just drain it out in spring, connect up to the fuel tap, turn it on and it's fires up 3rd kick.

Regards
Dave

--- End quote ---

Thanks Dave , sounds like a great idea and very little cost, I was thinking of just draining the carbs but your right it’s better to have something in the carbs to stop any corrosion developing and to keep the seals wetted over a lay up.

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