Author Topic: Long lost new member reintroduction...  (Read 1126 times)

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Online moonpup

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Re: Long lost new member reintroduction...
« Reply #20 on: September 02, 2021, 09:37:28 AM »
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#msg3905

The 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.
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline BRT-GTR

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Re: Long lost new member reintroduction...
« Reply #21 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, Brian
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I'm so glad I grew up in the 60s & 70s. I did so much stupid stuff and there's no record of it.............Anywhere !!

Offline Steve Swan

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Re: Long lost new member reintroduction...
« Reply #22 on: September 03, 2021, 01:19:03 PM »
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#msg3905

The 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 Mike,

Thanks for that tip and link to the very interesting thread on this vibration problem affecting the posts.  The holes are smaller than 5/32"  Are these kits still available...?  (i'm kind of assuming not, but...)

Offline Steve Swan

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Re: Long lost new member reintroduction...
« Reply #23 on: September 03, 2021, 01:25:48 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, Brian

Brian, 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.

Online moonpup

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Re: Long lost new member reintroduction...
« Reply #24 on: September 03, 2021, 01:43:10 PM »
Per the float post repair kits,  check with either Richard or CPC... won't know unless you ask. 😁
« Last Edit: September 03, 2021, 01:46:33 PM by moonpup »
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline Steve Swan

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Re: Long lost new member reintroduction...
« Reply #25 on: September 03, 2021, 01:56:08 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, Brian

Brian, 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. 😁

Thanks, Mike.  Will do. 

Offline Steve Swan

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Re: Long lost new member reintroduction...
« Reply #26 on: September 03, 2021, 02:06:06 PM »
Hmm.  I am wondering why pins couldn't be made from Delrin rod.  i've used Delrin in the past, it has many applications.  is even used for making ball bearings, automotive parts and much more.  if the pin was made of Delrin, then the float wold not be ratting against hard metal.  i could turn the Delrin to the size of the existing holes with a very minimal interference fit, just enough to push the pin in by hand.  Here's a link about Delrin  http://www.complast.com/delrin/DelrinData.pdf

Offline OldSwartout

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Re: Long lost new member reintroduction...
« Reply #27 on: September 03, 2021, 03:24:07 PM »
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.
Karl Swartout
Mooresville, IN
BS175 Roadracer. BS200RS, BS175HS
BS350 GTR

Offline Steve Swan

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Re: Long lost new member reintroduction...
« Reply #28 on: September 03, 2021, 03:56:34 PM »
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.

Karl, thank you for your kind reply; i replied to your email.

Yeah...  drilling out those posts is a bit of a scary thought; one i will need to approach with forethought and care. As i recall, the posts are not degraded.  I'm glad to hear you think the Delrin is a viable option.  I'm just trying to think outside the box, if you will...

Online moonpup

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Re: Long lost new member reintroduction...
« Reply #29 on: September 03, 2021, 04:28:41 PM »
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 Ive 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.
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline Steve Swan

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Re: Long lost new member reintroduction...
« Reply #30 on: September 05, 2021, 01:36:49 PM »
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.

Mike, thanks for your reply and the great picture!  Although i do have a drill press, i am inclined to drill the holes by hand, I'm pretty good with my hand work.  I did order some 3/16" Delrin rod, so once i have the rod, I'll measure the holes in the posts and see what diameter the rod would need to be turned down to fit the undrilled holes and decide what I might do from there.  Delrin is pretty rigid, so i would think in that short distance that small diameter of Delrin won't flex and won't rattle around like the brass pin.  Karl has graciously offered me a set of bushings, so if the Delrin does not work out, i can go with the bushings.  if i can get away without drilling, i'd feel better...  Was nice to find the YR1 7 mm float valves as with drilling and tapping, i only get one chance to make it right.

Offline MitchB

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Re: Long lost new member reintroduction...
« Reply #31 on: September 07, 2021, 02:23:00 PM »
Reading through these posts re. the carb "difficulties" - one has to ask: is it possible to simply buy new carbs? Are they still being manufactured, or is there a viable alternative..?

Offline disc valve

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Re: Long lost new member reintroduction...
« Reply #32 on: September 08, 2021, 10:49:46 AM »
Testing 1 2 3

Offline disc valve

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Re: Long lost new member reintroduction...
« Reply #33 on: September 13, 2021, 06:24:29 AM »
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

Offline Steve Swan

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Re: Long lost new member reintroduction...
« Reply #34 on: September 13, 2021, 07:58:53 PM »
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

Thanks for your reply!  Could you give a bit more context of you mean that you "tried to set the upper 2 sets of mounts taking most of the weight of the engine because there's not a lot to stop the weight bottoming out on the lower mounts otherwise?" 

You installed the upper cushions first rather than installing the bottom cushions first? 

if you installed the top cushions first, was your engine already in the frame?

 


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