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Author Topic: CB750 cam chain tensioner Aftermarket ID Messnermoto!!  (Read 616 times)

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Offline Dresda500

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CB750 cam chain tensioner Aftermarket ID Messnermoto!!
« on: September 13, 2024, 04:26:32 AM »
Good day! I remember some years back there was some very complex aftermarket tensioners that came out. Can anyone ID this one? I recently bought a Rickman CB750 that has been a road racer both in UK and then imported to Norway in the early 2000s. The motor is partially disassembled so sorting parts to make it whole again. It’s 900+cc , ..67mm bore with CR33 carbs and custom cam by a Norwegian cam grinder KM cams
« Last Edit: September 13, 2024, 11:05:23 AM by Dresda500 »
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Roadracing CB250K, Dresda CB500 and Martin KZ1000
Special intrest in hand made frames/bikes, porting/flowbench and Dyno tuning of vintage bikes

Offline scottly

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Re: CB750 cam chain tensioner Aftermarket ID
« Reply #1 on: September 13, 2024, 08:03:27 AM »
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Offline Dresda500

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Re: CB750 cam chain tensioner Aftermarket ID
« Reply #2 on: September 13, 2024, 11:04:44 AM »
That's the one! I couldnt remember the name....Is he still making them or what was the long term concensus? I'm not sure how many miles this one has on it, but it looks ok at first glance. I'll send him a msg on Instagram, doesnt look like he has been active on here for a while.

Any others currently using this?
« Last Edit: September 13, 2024, 11:07:55 AM by Dresda500 »
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Instagram: hansrodncycle
Roadracing CB250K, Dresda CB500 and Martin KZ1000
Special intrest in hand made frames/bikes, porting/flowbench and Dyno tuning of vintage bikes

Online PeWe

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Re: CB750 cam chain tensioner Aftermarket ID Messnermoto!!
« Reply #3 on: September 13, 2024, 11:43:57 PM »
67mm is 890cc or 888.4cc when calculated with 63mm stock rods.
I have a setup.

67.5mm bores have been said to be 915cc for years which is wrong. 901.77cc

I woke up when I saw Dynomans 915cc kit with 68mm pistons, 915.18cc Good to know when ordering parts as rings and gaskets.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline turboguzzi

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Re: CB750 cam chain tensioner Aftermarket ID Messnermoto!!
« Reply #4 on: September 15, 2024, 02:25:49 AM »
Im always in touch with mirko messner, will tell him to drop in here
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Online PeWe

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Re: CB750 cam chain tensioner Aftermarket ID Messnermoto!!
« Reply #5 on: September 15, 2024, 03:16:27 AM »
Quote from: turboguzzi on September 15, 2024, 02:25:49 AM
Im always in touch with mirko messner, will tell him to drop in here
He made good stuff.
I bought oil pump rotors from him. Should have ordered one set more. ;D
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Dresda500

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Re: CB750 cam chain tensioner Aftermarket ID Messnermoto!!
« Reply #6 on: September 15, 2024, 06:31:00 AM »
Thanks guys! Yes, you are correct PeWe, the Maskinkort from our road racing license had it at 903cc, but obviously incorrect. You likely recognize this catalog from back in the day..;)
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Instagram: hansrodncycle
Roadracing CB250K, Dresda CB500 and Martin KZ1000
Special intrest in hand made frames/bikes, porting/flowbench and Dyno tuning of vintage bikes

Online PeWe

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  • Bike almost back to the 70's 2015
Re: CB750 cam chain tensioner Aftermarket ID Messnermoto!!
« Reply #7 on: September 15, 2024, 12:22:45 PM »
Yes, I heard about that shop.
I had  and still have a shop in my town, MotoSpeed that sold RC and Action Fours parts plus offered same kind of engine work as RC did.
Closer to mid 80's Vance & Hines parts.
My K6 got its RC 836, ported head, cam, lightened alternator there 1983-84.

Same shop and mechanic has done more head work and bore jobs for me the last 10 years ;D
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline emlupi

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Re: CB750 cam chain tensioner Aftermarket ID Messnermoto!!
« Reply #8 on: September 15, 2024, 12:35:17 PM »
https://messnermoto.com/store/

He has this website with lots of beautiful moto-bling. I didn’t see the tensioner listed but maybe if you contact him?
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