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Author Topic: BSA B50 -500 APG Build  (Read 254167 times)
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Koncretekid
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« Reply #810 on: November 29, 2017, 10:21:18 AM »

I am in the midst of conversion to single shock rear suspension which I have posted in the Tech section under Suspension.

Tom
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!
55chevr
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« Reply #811 on: November 29, 2017, 10:01:56 PM »

The engineering and thought you put into your machine is extraordinary. Always learn something when I look over your bike.
Joe
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Old Scrambler
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« Reply #812 on: December 03, 2017, 06:23:21 PM »

Tom...maybe a curved bar-brace ahead of the tire and/or inside of the welded 'kinks'............otherwise......looking real good smiley
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
wobblywalrus
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« Reply #813 on: December 03, 2017, 08:12:18 PM »

This is what I did.  The arms were extended 3 inches using butt welds.  1/4 inch thick gusset plates were welded on each side for a total of four plates.  The vacant space in between the arms was boxed for strength.


* tri swing arm1.JPG (116.43 KB, 800x600 - viewed 58 times.)

* tri swing arm2.JPG (110.05 KB, 800x600 - viewed 52 times.)

* tri swing arm 3.JPG (152.85 KB, 800x600 - viewed 56 times.)
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Koncretekid
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« Reply #814 on: December 06, 2017, 06:36:42 AM »

Tom...maybe a curved bar-brace ahead of the tire and/or inside of the welded 'kinks'............otherwise......looking real good smiley
Dennis,
I'll be doing something like that once everything is in place to check clearances.

By the way Dennis, I'm also building a 250 motor to run in the M Class at Loring, Maine.  Of course, if the motor is strong, it will bolt right into my A Class frame!  Photo is attached of the frame without the motor.

This is what I did.  The arms were extended 3 inches using butt welds.  1/4 inch thick gusset plates were welded on each side for a total of four plates.  The vacant space in between the arms was boxed for strength.

Bo,
Ditto the answer I gave to Dennis above.  Making sure the tire clears the spring, and making sure the swingarm clears the frame where I've cut it just behind the foot peg mounts.  Fitting a tube or shaped and boxed in plates inside the swingarm between the spring and the rear wheel would be most efficient.

Tom


* B25 painted with wheels.jpg (224.77 KB, 1280x853 - viewed 94 times.)
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!
Old Scrambler
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« Reply #815 on: December 06, 2017, 09:31:43 PM »

Good work.................I'll be working on my Cub for 2018.............I made one run in 2016 at more than 90-mph but it started missing and slowed with no time for a recovery attempt.
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
wobblywalrus
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« Reply #816 on: July 04, 2018, 11:52:47 PM »

Tom, you had a problem with the brake pucks not retracting, as I recall.  The same happened to me.  The solution was to take the caliper apart and to remove the puck seals.  Then, all corrosion in the seal grooves was scraped out using a dental pick.  Next, the groove surfaces were polished using a Dremel tool.  Then, the caliper was put back together.

Corrosion behind the seals was pushing them up against the puck and they would not allow the puck to retract.  Removing the corrosion did the trick.
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