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Old 11-30-2012, 11:09 AM   #16
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Joined: Mar 2011
Location: Silver Spring, Md
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Originally Posted by ignatz72 View Post
Didn't the early /5 CV carbs omit the slide spring?

That could cause a rich bog on throttle.
It's not something they omitted exactly. The big slide spring was added years later and is a new part that can be retro fitted to the early type 64 carbs. In that diagram I posted earlier you'll notice no number for the slide spring. I guess it's a /6 diagram and the pictures are sometimes reused for different years. They don't need a number here for /6 because it's not a part for /6 either.

When the slide springs did appear they went through a change also. The earlier springs are heavier than later springs. So if you want to add these I'm told the later springs work better.

They sometimes help but I still have the faster idle that becomes too slow after 30 seconds or so. I think I still haven't gotten my carbs right after many years of messing with them.

I do not think that the slide springs affect anything that would be described as a bog. The propaganda is that they help a return to idle. Which they might do, sometimes.
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Old 11-30-2012, 11:23 AM   #17
Bill Harris
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It's the R60/5 that has the venerable slide-valve carbs. The R75 has CV carbs. Check the points AND timing as well as the carb diaphragms.

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Old 11-30-2012, 11:59 AM   #18
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Hmm, good info then. My thought always was that the springs were there to "assist" the diaphragm-riding slides in finding the correct position via throttle/vacuum (as well as assisting closed throttle return to idle).

In other words, without the regulating spring, the slide could be cracked open too quickly, ala Dels or Mikunis.
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