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Retro Thumper project (Read 1996 times)
badwolf
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Re: Retro Thumper project
Reply #135 - 03/14/22 at 20:04:27
 
I have about 20,000 miles on mine since doing that and have maybe 1mm wear. It has to be checked every 10,000 or so, but I think without the follower bending, the chain itself will last a long time.
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Dave
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Re: Retro Thumper project
Reply #136 - 03/17/22 at 17:55:13
 
With a new chain, good used chain guides and the shaved head - the plunger was out 12mm.

I removed the pawl and installed a spacer to limit the amount the plunger could move backward from the 12mm it wanted....and I did not like the action of the plunger.  If I pushed it out manually it got in a bind and didn't want to retract.  I believe the plunger was getting a bit crooked in the tensioner body.

So.....I decided to make my own plunger that was longer and spanned nearly full length in the plunger body.

I used a large bolt/nut for the machining, and this photo shows that I had machined some flats and drilled the hole for the chain guide shoulder bolt.
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Dave
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Re: Retro Thumper project
Reply #137 - 03/17/22 at 17:57:03
 
By using a bolt with a nut, I was able to be sure the flats were level and parallel and whenever I took it out to measure it was easy to get it back into the mill at the same place it was the previous time.
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Dave
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Re: Retro Thumper project
Reply #138 - 03/17/22 at 17:58:54
 
After I got the flats cut I put the bolt into my lathe and drilled the center hole for the spring - then I started cutting the OD of the shaft.

Once I had the OD cut to size I cut it off at the length I wanted.
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Dave
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Re: Retro Thumper project
Reply #139 - 03/17/22 at 17:59:52
 
This is what the piece looked like with the remainders of the "donor" bolt.
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Dave
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Re: Retro Thumper project
Reply #140 - 03/17/22 at 18:02:17
 
It now works much smoother as the plunger does not get angled in the housing.

I drilled a small hole and countersunk the edge to provide a supply of oil into the housing.  It is my hope that the housing will fill up with oil when the engine is running and provide a bit of damping to the tensioner.
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Dave
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Re: Retro Thumper project
Reply #141 - 03/17/22 at 18:07:52
 
I also was able to pick up all my freshly plated parts today!

There are nuts/bolts from several cylinder heads, from the chassis of this project, several pulley hub bolt sets, and a lot of old metric nuts/bolts for other stuff that I will use as needed.

I spent an awful lot of prep time with degreasing, a Phosphoric acid bath to remove old plating, a vibrating ceramic tumbler, bead blasting and wire brushing so that the plating would work.

They sure do look nice!

Now I can start assembling the chassis and adapting parts.
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badwolf
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Re: Retro Thumper project
Reply #142 - 03/17/22 at 18:45:25
 
Dave,
Those parts look sweet! You are going to get all your bikes so pretty you won't dare ride them.
The new plunger looks awesome, don't forget to mark down extension at xxx mileage, and the max extension you are comfy with.
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Armen
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Re: Retro Thumper project
Reply #143 - 03/17/22 at 21:28:16
 
Excellent work Dave!
Thanks for sharing!
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Re: Retro Thumper project
Reply #144 - 03/17/22 at 22:23:54
 
Very nice work, Dave!
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DragBikeMike
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Re: Retro Thumper project
Reply #145 - 03/17/22 at 23:35:39
 
The new tensioner looks great Dave.

What did you have the hardware plated with?  Zinc, chrome, nickel?  The plating looks good.  Was it expensive?
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Ruttly
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Re: Retro Thumper project
Reply #146 - 03/18/22 at 02:07:42
 
Grin Grin Grin
He got the sickness too !

Atta boy Super Dave
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Dave
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Re: Retro Thumper project
Reply #147 - 03/18/22 at 02:47:28
 
DragBikeMike wrote on 03/17/22 at 23:35:39:
What did you have the hardware plated with?  Zinc, chrome, nickel?   Was it expensive?


It is plated with Zinc Chromate.



Years ago there were several platers in this area, and the local fellows said you could get barrel plating done for $20 a bucket full.  Although I never got anything done that cheap - if was pretty reasonable.  For bigger parts like axles, sprockets and brake levers the price goes up as they have to hang the parts - and springs need some kind of process to plate the hardened metal......and the priced goes up.  I didn't include a photo but I also had 4 axles and 1 sprocket plated, 3 compression release springs and 2 kickstand springs.

Unfortunately the price of labor and materials has gone up since the last time I had a bucket of bolts plated 8 years ago.....the cost was more than twice what I thought it would cost.  $400!  I was really shocked when I went to pick them up and found out what it cost!  I will be able to sell the MiniTrail sprocket for a pretty good price and that will help to finance some of this.....it was a new one but the plating was tarnished and it was too ugly for somebody to put on a restored bike.

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ohiomoto
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Re: Retro Thumper project
Reply #148 - 03/18/22 at 17:03:43
 
Ruttly wrote on 03/18/22 at 02:07:42:
Grin Grin Grin
He got the sickness too !

Atta boy Super Dave

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He sure does!  

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Dave
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Re: Retro Thumper project
Reply #149 - 03/19/22 at 03:12:26
 
Ruttly wrote on 03/18/22 at 02:07:42:
Grin Grin Grin
He got the sickness too !


I have been sick for a long time.....ask MMRanch!

Thursday provided a big hit on my wallet.  My wife needed front tires on her car prior to the trip to Texas.  I normally buy them as a set of 4 but she got a nail in 1 tires sidewall last fall, and then broke a cord hitting a pothole as well - so she got 2 new tires about 6 months ago.  The new tires I bought on Thursday were $513!  The lug nuts on her car are steel with a thin stainless steel shell on them.  The car is 7 years old and has 100,000 miles on it, and with all the tires changes and rotations the stainless shell on the lug nuts has become loose and distorted and I have to drive the socket onto the nut.  Since the factory lug wrench won't go on the nuts anymore I decided to buy replacement lug nuts that are solid steel with chrome plating.....a set of 20 was $148!  With the plating, tire and lug nuts.........I spent over $1,000 on Thursday!  
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« Last Edit: 03/19/22 at 08:47:11 by Dave »  

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