Author Topic: CB750 Hardwelded rockers: Dynoman vs CycleX vs Megacycle, same quality?  (Read 2697 times)

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Offline PeWe

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Hi,

I have seen that CycleX hardwelded rocker arms have a much better price. Are they done locally by CycleX?
- Anyone here that have tried them, preferable hard use in a racebike and later inspected the wear and found them OK?
Is the finish and durability of these as the Dynoman and Megacycle alternatives?  Other alternatives?

I have a hardwelded cam that probably need hardwelded rockers as I have understood when reading posts here about hardwelded cam vs stock rocker arms and opposite.
« Last Edit: February 28, 2018, 03:33:14 am by PeWe »
CB750 K6-76 1005cc JMR Billet block.
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 MessnerMoto

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Re: CB750 Hardwelded rockers: Dynoman vs CycleX vs Megacycle, same quality?
« Reply #1 on: February 28, 2018, 05:39:31 am »
Find a local shop that does hardwelding of rockers. Or somewhere near you

Usually shop that does it do it in this way(for sohc example)).

1. They remove chrome on 7 rockers, they leave one intact
2. Hard weld surface on 7 rockers with removed chrome
3. They put rockers in replicator machine(one by one probably) with master sample being the one rocker that is left intact.
 Replicator machine copies/grinds surface according to original one
4. When 7 are finished they repeat for one left



Offline gschuld

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Re: CB750 Hardwelded rockers: Dynoman vs CycleX vs Megacycle, same quality?
« Reply #2 on: February 28, 2018, 06:37:40 am »
For that matter, you can bring in a full set of 8 plus one extra to use as the profile pattern.  This allows all 8 to be done at once, saving both them and you the extra time/money.

George

Offline slikwilli420

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Re: CB750 Hardwelded rockers: Dynoman vs CycleX vs Megacycle, same quality?
« Reply #3 on: February 28, 2018, 06:55:47 am »
I found a place out in Cali that does it. They also make custom rocker towers/shafts and billet roller rockers. A billet roller rocker would be quite the setup for sure. For the $800 some charge to hardweld Ill bet you could get most or all of a set of billet roller rockers custom made.
All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline PeWe

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Re: CB750 Hardwelded rockers: Dynoman vs CycleX vs Megacycle, same quality?
« Reply #4 on: February 28, 2018, 11:04:21 am »
Thanks guys for the responses. I do no have any cam welders around here in Sweden I'm aware of that can do rocker arms. I found on internet but that will probably cost more than order megacycle version and I'm not sure they do rocker arms.
The best is if they have done CB750 rockers before.

CycleX has a good offer for just under 500 USD. 
CB750 K6-76 1005cc JMR Billet block.
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 cbr954

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Re: CB750 Hardwelded rockers: Dynoman vs CycleX vs Megacycle, same quality?
« Reply #5 on: February 28, 2018, 12:13:28 pm »
I have used 3 sets from cyclex, never had issue.   Two sets are in drag motors and one set is in a street motor but none get many miles on them.
03 CBR954RR, 72 750 chopper(970cc
F2 head), 2017 CRF450R, 2001 CR250R, 72 CB500, 79 XR250, 04 CRF50,70's soon to be rebuilt cb750 drag bike.

Offline MessnerMoto

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I am paying 15eu locally per rocker... Pretty sure you can find someone locally/nearby country... It is a standard job...

Offline PeWe

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I am paying 15eu locally per rocker... Pretty sure you can find someone locally/nearby country... It is a standard job...
A quick search found one mechanic that did that 2005 for almost 40 euro each. That man was old back then, maybe not in business today.
It would be better if finding local alternatives like CycleX, order 8 rockers, no cores to be sent in. Shipping from USA and customs here will add some.
CB750 K6-76 1005cc JMR Billet block.
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 MessnerMoto

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https://hbs-customs.de/allgemeine-motorarbeiten/

-13eu... but maybe it is old... contact them...

search for "Kipphebel schleifen" "Kipphebel Reparatur"

for sure it will be a lot cheaper then importing from US....
« Last Edit: March 01, 2018, 04:35:02 am by MessnerMoto »

Offline PeWe

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Thanks! Easier to find when I know more what to look for.
I got just an email answer from a guy in Germany that has raced his CR750 for many years with stock rockers. Min 0.1 mm lash and a good oil was his recipe to avoid problems.
I hoped his shop had improved rocker arms on the menu toghether with the +90rwhp upgrades he has.
CB750 K6-76 1005cc JMR Billet block.
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 PeWe

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  • Posts: 14,974
  • Bike almost back to the 70's 2015
Re: CB750 Hardwelded rockers: Dynoman vs CycleX vs Megacycle, same quality?
« Reply #10 on: March 15, 2018, 01:14:14 pm »
My hardwelded cam got company today. The fresh rocker arms look good. Pads will hopefully be parallel with the cam lobes  ;D

One old rocker arm with chrome still OK as a reference.
Lets see when I'll change cam to the 125-20 and the new rockers from CycleX (by Web cam)
The cam that sit now need 4-2-1 and new dyno run first. Then swap cam and another dyno.
CB750 K6-76 1005cc JMR Billet block.
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