I just finished doing a carb rebuild (gaskets, O-rings, needles and jets, float needles and floats) that included the Motobins hydrin diaphragms. They are much thicker than the old ones that I removed, but I attributed that to 28 years of wear and tear.
Today is the first day I’ve had the bike on the road since the rebuild and the middle part of the power band where the diaphragms and slides come into play definitely seems sluggish to come on, but is fine once the throttle is about half way open. This may be due to the fact that the carbs are only rough-tuned and the top of the idle circuit is not providing a smooth transition into that middle band. I have not moved my needle setting up from the 3rd to the 4th position like Lou and Monte have. I’m thinking I’ll order a pair of Bing diaphragms and install those for comparison sake and keep the Motobins ones for spares. I’ll let y’all know what I find.
Now I’m just glad to have the bike back together and on the road again!
John Mc
