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Old 07-28-2013, 01:52 PM   #25
Studly Adventurer
Joined: Feb 2013
Oddometer: 847
Originally Posted by disston View Post
I don't think the part about "early" carbs having the one hole is a good way to say this. I have a 1975 R90/6, which is earlier, and it has 4 holes.
Good point I should have said some early carbs....

Perhaps it was only flat tops that were deficient in enricher holes.

So Bing knew how to engineer a progressive enricher in 75. I can't fathom why they went backwards in sophistication bewtween 75 and 79 and then needed a service bulletin to put it right.
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