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Author Topic: CB750 No Plunger Hellride Freedom Machine  (Read 32396 times)

Offline Maritime

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Re: CB750 No Plunger Hellride
« Reply #250 on: Jul 04, 2018, 10:48:07 »
Slick
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline irk miller

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Re: CB750 No Plunger Hellride
« Reply #251 on: Jul 12, 2018, 18:10:12 »
I took some time off from working on the Mid-Ohio haul to make the chain tensioner.  I machined the drum and welded an old gear shift lever to it and a cap screw to the shift lever.  I machined a bronze bushing to insert into the drum, then on the backside I machined a delrin bushing to fill around the bronze. 

In all but the last pic, the arm is basically straight.  In the completed unit, I bent an "S" into the lever which centers the skateboard wheel over the pivot and moves it clear of the frame.

In this pic are all the components minus the spacer to go behind the skateboard wheel that centers it to the chain.


This is the backside of the tensioner, where the delrin surrounds the bronze.



Here's the unit put together with the spring from a kickstart mechanism.  One thing that changes on the spring from what you see in the pic, I spread the first coil out to help put more tension on the spring and to help it spring back a little better.  That may not have been necessary, but it doesn't hurt either.



Another view of the arm and pivot.  Notice the drum isn't machined square, but instead has a curve to it.  This helps the spring move toward the arm and keeps it from binding in front of the mechanism.  It also gives it more throw, as the way the spring works the ID shrinks when the tensioner actuates.  I didn't want the spring too loose, but too tight kept it from swinging very far and it would bind.



This is the pic of the completed tensioner.  The arm is bent, which moves the wheel back toward the center of the bike.  The arm is also shorter than in the previous pics.





Offline advCo

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Re: CB750 No Plunger Hellride
« Reply #252 on: Jul 12, 2018, 18:22:07 »
Slick as shit man. Nice.  8)
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline Maritime

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Re: CB750 No Plunger Hellride
« Reply #253 on: Jul 12, 2018, 18:29:06 »
Yep. Thats awesome
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline irk miller

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Re: CB750 No Plunger Hellride
« Reply #254 on: Jul 12, 2018, 20:14:52 »
I haven't taken any pics from this side.


Offline WhyNot

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Re: CB750 No Plunger Hellride
« Reply #255 on: Jul 13, 2018, 06:39:58 »
Man, that is slick.

Looks like you'll have this on the road b4 I get my lazy azz out and fix my carbs, and get mine running again.

Nice work Eric.
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline Pete12

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Re: CB750 No Plunger Hellride
« Reply #256 on: Jul 13, 2018, 10:52:12 »
Hey Irk, nice bike for sure, but what's the black coupe behind it?

Offline Brodie

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Re: CB750 No Plunger Hellride
« Reply #257 on: Jul 13, 2018, 11:04:00 »
Wall art.
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline irk miller

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Re: CB750 No Plunger Hellride
« Reply #258 on: Jul 13, 2018, 11:11:25 »
Wall art.

Haha.  For now it is, Brodie.  Except it's more the wall than the art.

Hey Irk, nice bike for sure, but what's the black coupe behind it?

It's a 1970 Plymouth Roadrunner.

Offline advCo

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Re: CB750 No Plunger Hellride
« Reply #259 on: Jul 13, 2018, 11:24:08 »
A 21' long shelf? I have one of those but its a few feet shorter.  ;D
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0