SOHC.co.uk Forums > CB350/400

Won't return to idle/slight oil seep...

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Bryanj:
They were for the Yanks to stop people "fiddling" in those states with emmisions rules

McCabe-Thiele (Ted):
One advantage of the black stoppers is that they give you a visual reference point - i find it easy to loose track of how many turns the screw has moved especially if you have been tinkering with the settings over a few days.

Trigger:

--- Quote from: K2-K6 on July 23, 2023, 09:23:48 AM ---Black airscrew limiters, I'd view them as obviously limiting movement, but think they look to do tbat specifically in relation to situations that we probably don't encounter in these lowlands  :)

For screws set at sea level, then riding up to high altitude, they seem to give a set adjustment to compensate without having to do the "turns counted out" thing. In other words you could easily set them at one end or t'other in that scenario. And maybe an early nod to restriction on adjustment for emissions legislation in some market.

Outside that, they dont seem to do much, but some may want them for originality purposes.

--- End quote ---

I have never understood this sea lever and high altitude  ::)

I have rode old Honda's though out the world, starting at sea level, up to 2500 meters and back down to sea level over and over again. On all these trips i have never tinkered with the carbs and the bike has always run spot on.

McCabe-Thiele (Ted):
I believe it is due to the density of the atmosphere being rarer at height that leads to engines effectively running rich due to lack of oxygen - iirc it is at extremes of altitude and worse in highly tuned engines. Might be that as bikes rely on gravity rather than fuel pumps the effect is mitigated.

Trigger:
My experience I never had problem driving highly tuned engine cars with fuel pumps from the UK, crossing the Austrian alps, the full length of Yugoslavian mountains and crossing the northern Greek mountains. Diving a Noble M12 or a UVA sandrail that had twin choke Webber's   ;)   

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