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1  General Category / Tech Corner / Re: Carbs are working well??? on: January 24, 2022, 11:05:21 AM
Hello a_morti

Thank you for your quick reply.
I understand the function of the carburettors, but have no experience with the carburettors on this machine.
Therefore, my question is how fast the vacuum-controlled slides should lift and whether they open all the way up.
Our slides are smooth, but they don't slide all the way up, they look about 1cm into the throttle path.
Even with the throttle wide open, they open slowly, taking about 5 seconds to open.

Can anyone tell me which hole the vacuum is coming through up there???

Thanks for your help!



2  General Category / Tech Corner / Carbs are working well??? on: January 23, 2022, 10:21:44 AM
I am here for the first time today and of course I have a question:-)
My son bought an '89 CB1 on which we did a complete engine overhaul.
Now we have rebuilt the bike so that it is actually ready to run and it starts immediately, runs smoothly and doesn't make any strange noises.
But when I look into the carburettors without the air filter box and with the engine running, I am surprised that the vacuum-controlled slides go up quite slowly when I open the throttle and never make it to the top position. I don't know this from my other machines with carburettors....
How fast should the slides go up?
Do they open all the way?
Could it be that there is not enough vacuum to pull the slides all the way open?

The carburettors have been cleaned, adjusted and checked twice that the diaphragms are not damaged!

Is there any good advice for me on what else I could check?

Many thanks for your efforts

Greetings from Germany

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