Carb setting when throttle adjustment is lost

[edd_barker]

Hi All,

so another question relating to my 1962 Sportwin 10HP, but hopefully it relates to a bunch of other motors.

I'm in the process of setting up my carb after a rebuild, and I've read the very useful guide of the similar carb that a couple of people on here recommended.

However, my motor has a simple bolt that adjusts how much the throttle is allowed to drop back, ie. the more you tighten the bolt, the higher that the motor will idle. Unscrewing the bolt drops the rev rate accordingly.

Having fiddled with this bolt, I now don't know where the idle was set before, so I don't have a starting point for tuning the carb, I can't figure out which order I need to do things. How low do I drop the idle before adjusting the carb? I have it set to the recommended starting point, but I don't know whether to adjust the carb or the idle first?

I have a feeling that there will be a fairly obvious answer...

Thanks a lot guys,

Edd

[Daviet]

I would set the carb needle first and then set the stop screw. You might have to control the idle speed with the throttle handle till you get it set.

[Silvertip]

You do carb ajustment with the throttle cable disconnected.
1) Set idle SPEED to the recommended idle rpm IN GEAR. If it won't idle that low, set it as slow as it will go yet stay running. You may want to tie off to the dock until you get at least close to the proper settings.
2) Set the idle MIXDTURE. As engine rpm will likely increase, reset the IDLE SPEED.
3) Repeat the idle MIXTURE then reset idle SPEED.
4) Repeat this process until the engiine can be reliably set to the idle speed spec.
5) Now do the high speed mixture if those are adjustable.