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Steve..... yes, the damaged float posts were such an issue that Bridgestone/Rockford ended up producing a repair kit consisting of 2 brass bushings, an extra float pin and instructions for installing. Here's some old discussion about this issue....https://bridgestonemotorcycleparts.com/index.php?topic=1154.msg3905#msg3905The kit instructs that the damaged post holes are to be drilled out (with a drill press / not by hand) using a 5/32 drill bit. If you can fit this size drill bit freely through your posts, then this kit would not work on your carbs. Let us know what you find out.
Hi again Steve, you asked about other effects of vibration on the frame etc. It is known that the rear engine mount bracket on the downtube can develop a fracture, usually at the front near the weld to the downtube. I have had one of the rear triangular engine mount plates fracture. Good luck with your restoration, Brian
Quote from: Steve Swan on September 03, 2021, 01:25:48 PMQuote from: BRT-GTR on September 02, 2021, 01:24:09 PM Hi again Steve, you asked about other effects of vibration on the frame etc. It is known that the rear engine mount bracket on the downtube can develop a fracture, usually at the front near the weld to the downtube. I have had one of the rear triangular engine mount plates fracture. Good luck with your restoration, BrianBrian, thanks for your reply; good to hear from you. i imagine sooner than later i will replace the cushions. It's a bit dismaying there's this much vibration, but on the other hand i'm not surprised; pretty typical of machines from that era and earlier.Check with either Richard or CPC... won't know unless you ask. 😁
Quote from: BRT-GTR on September 02, 2021, 01:24:09 PM Hi again Steve, you asked about other effects of vibration on the frame etc. It is known that the rear engine mount bracket on the downtube can develop a fracture, usually at the front near the weld to the downtube. I have had one of the rear triangular engine mount plates fracture. Good luck with your restoration, BrianBrian, thanks for your reply; good to hear from you. i imagine sooner than later i will replace the cushions. It's a bit dismaying there's this much vibration, but on the other hand i'm not surprised; pretty typical of machines from that era and earlier.
Delrin sounds like a good idea. I have broken off a post before, trying to drill it. It is also possible to make bushings using 5/32" brass tubing from a hobby or hardware store, then insert a 1/8" piece of tubing inside that and use a #40 drill bit shank for a float pin.Check your email, I sent a message regarding the BS repair bushings.
Steve, the attached pic is an example of how I hand drilled out a set of posts on a set of carbs that needed the bushings. The carb pictured here is my already destroyed unit that I've cut apart to examine the various passageways in the body.I just used my tap handle with the 5/32 bit to slowly open up the hole to the correct diameter. This way I could constantly keep check on the bit's angle. (use oil and go slowly..... don't force things.) I also went straight through to the other post to insure that the float pin would be straight and not bind.I don't have a drill press, so this was the best way for me. It worked out great.
When i repaced my cusion mounts i tried to set the upper 2 sets of mounts taking most of the weight of the engine because theres not a lot to stop the weight bottoming out on the lower mounts otherwise