Author Topic: H-Beam Rods  (Read 1293 times)

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Offline Old Scrambler

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Offline PeWe

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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 MRieck

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Re: H-Beam Rods
« Reply #2 on: February 06, 2023, 05:48:28 am »
I'm sure they'll handle anything a CB can dish out. They look pretty heavy that's for sure....no beam taper towards the small end. I've always maintained a Carrillo A beam would be great for CB's. Light and plenty strong enough.
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Offline dragracer

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Re: H-Beam Rods
« Reply #3 on: February 06, 2023, 05:15:15 pm »
I  had a concern about the weight myself and sent them a message several days ago via ebay, but haven't received any response as of today.


I'm sure they'll handle anything a CB can dish out. They look pretty heavy that's for sure....no beam taper towards the small end. I've always maintained a Carrillo A beam would be great for CB's. Light and plenty strong enough.

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: H-Beam Rods
« Reply #4 on: February 06, 2023, 07:13:55 pm »
I'm sure they'll handle anything a CB can dish out. They look pretty heavy that's for sure....no beam taper towards the small end. I've always maintained a Carrillo A beam would be great for CB's. Light and plenty strong enough.

410gm. Last I weighed Carrillo they came in ~ 330gm perhaps. 
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Offline scottly

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Re: H-Beam Rods
« Reply #5 on: February 06, 2023, 07:31:04 pm »
What do Carrillos cost?
Don't fix it if it ain't broke!
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: H-Beam Rods
« Reply #6 on: February 06, 2023, 08:17:19 pm »
APE special order #CAR5030 - SOHC 750 (K MODEL) - $1411.00 Set of four

These rods are now made to order from Carrillo. Lead time is 16 weeks. The good news is that Cycle X has them on the shelf.

CycleX $1499 on the shelf
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Offline dragracer

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Re: H-Beam Rods
« Reply #7 on: February 06, 2023, 09:21:24 pm »

I looked over that ad carefully for the weight a few days ago and that wasn't listed. Maybe that was his way of answering my question.  Nevertheless,  thanks for the information on the weight of the Carillos for comparison.  I've got to do something about freshening up my F3 engine. A crank replacement is in order due to journal wear so I'm contemplating changing out the RC steel rods while it's down. A suitable alternative is the Cycle Exchange super rods like I have in the newer built F1 engine. But at least these H beams are an option as well.  I doubt I'd ever reach the horsepower capacity to justify the cost of Carillos on my budget.

Just wondering if anyone has broken a Cycle Exchange super rod yet???

I'm sure they'll handle anything a CB can dish out. They look pretty heavy that's for sure....no beam taper towards the small end. I've always maintained a Carrillo A beam would be great for CB's. Light and plenty strong enough.

410gm. Last I weighed Carrillo they came in ~ 330gm perhaps. 

Offline PeWe

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Re: H-Beam Rods
« Reply #8 on: February 07, 2023, 12:00:25 am »
The weight of those aussi rods would be good to know.
They look good.
I'm currently fiddling with new Super rods and a crank. Crank might be updated locally if possible to balance it.
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 Tracksnblades1

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Re: H-Beam Rods
« Reply #9 on: February 07, 2023, 12:36:26 am »
https://www.rpengines.com.au/

mailto:engines@rpengines.com.au

This guy used to sell the same on eBay several years back.
Made some really big bore cb750 sohc a while back
Should have some old eBay messages back and forth..
Maybe Terry and Bear know more…🤔
« Last Edit: February 07, 2023, 12:38:06 am by Tracksnblades1 »
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Offline PeWe

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Re: H-Beam Rods
« Reply #10 on: February 07, 2023, 01:12:59 am »
OK, the earlier mentioned 410 grams was for these rods.

https://www.ebay.com.au/itm/275140235175?_trkparms=amclksrc%3DITM%26aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20180105095858%26meid%3D71388fed4b5746d9ae7af6bfc10efcc6%26pid%3D100904%26rk%3D1%26rkt%3D20%26sd%3D275140235175%26itm%3D275140235175%26pmt%3D0%26noa%3D1%26pg%3D2332490&_trksid=p2332490.c100904.m5276

Click full description

. 116 mm c/c
. 15 mm little end bush
. 4340 Forged Chrome molly steel
. Shot peened
. H Beam Design
. Supplied With 200,000 Nm H/Tensile Bolts
. 15 mm Bronze Bush little end
. B/E bearings
. Weight 410 grams

Interesting if 410 grams is with shells and bolts.

My CycleX super rods with ARP bolts, nuts and bearing shells fitted.
416, 416, 417, 414g. Not the best scale, only grams not 1/10 grams or even half.

This will be addressed my local shop.
« Last Edit: February 07, 2023, 06:25:26 am by PeWe »
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 johno

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Re: H-Beam Rods
« Reply #11 on: February 07, 2023, 03:55:05 am »
Bloody good price , especially if your in the US, exchange rate Aus $1 = US.69cents,  calculates that Aus $800 = US$552 plus freight
GRASSHOPPER SOHC HONDAS ARE THE MEANING OF LIFE.

Offline simon#42

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Re: H-Beam Rods
« Reply #12 on: February 07, 2023, 08:29:30 am »
yes they look a bargain at that price , do we know anyone who has used them ?

Offline bear

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Re: H-Beam Rods
« Reply #13 on: February 10, 2023, 06:15:58 am »
yes they look a bargain at that price , do we know anyone who has used them ?

I haven't used them, but Hugh Robinson at RPE does good work from what I've been told.
I think Uncle Tez aka "Terry in Australia" has used his cast front break disc's.
The older I get the faster I was.

Offline Tracksnblades1

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Re: H-Beam Rods
« Reply #14 on: February 11, 2023, 12:41:41 am »
yes they look a bargain at that price , do we know anyone who has used them ?

I haven't used them, but Hugh Robinson at RPE does good work from what I've been told.
I think Uncle Tez aka "Terry in Australia" has used his cast front break disc's.

Bear, Terry,

Do you know if Hugh was offering sohc Billet 70mm stroker cranks with dual chain primary maybe  7-8 years ago for his 1240s…Been looking through my eBay messages but eBay must purge them after a time..
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Offline bear

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Re: H-Beam Rods
« Reply #15 on: February 11, 2023, 01:04:52 am »
yes they look a bargain at that price , do we know anyone who has used them ?

I haven't used them, but Hugh Robinson at RPE does good work from what I've been told.
I think Uncle Tez aka "Terry in Australia" has used his cast front break disc's.

Bear, Terry,

Do you know if Hugh was offering sohc Billet 70mm stroker cranks with dual chain primary maybe  7-8 years ago for his 1240s…Been looking through my eBay messages but eBay must purge them after a time..

I can't tell you I'm sorry.
I do know that he was doing DOHC900 conversion's at one time.
The older I get the faster I was.

Offline MRieck

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Re: H-Beam Rods
« Reply #16 on: February 11, 2023, 04:31:35 am »
yes they look a bargain at that price , do we know anyone who has used them ?

I haven't used them, but Hugh Robinson at RPE does good work from what I've been told.
I think Uncle Tez aka "Terry in Australia" has used his cast front break disc's.

Bear, Terry,

Do you know if Hugh was offering sohc Billet 70mm stroker cranks with dual chain primary maybe  7-8 years ago for his 1240s…Been looking through my eBay messages but eBay must purge them after a time..
I am sure he was selling SOHC stroker cranks with short rods.
Owner of the "Million Dollar CB"

Offline PeWe

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Re: H-Beam Rods
« Reply #17 on: February 11, 2023, 04:38:18 am »
RPE had billet cranks on eBay a year or two ago. Maybe 69mm stroke. I think they have rods for it too.

Ask where possible, as a question on eBay. His CB750 rod add.

I asked CCC Germany about heavy duty primary chains in their std Honda chains add recently. Got quick answer that a batch will soon be made, next day he found the last set he sent an PayPayl invoice for.

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 paul_cb836

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Re: H-Beam Rods
« Reply #18 on: February 11, 2023, 11:56:39 pm »
Hugh had a batch of billet 69mm cranks made up with short  rods. Last I spoke to him, some time ago, he only had one left. Pretty sure he would be using the H beam rods in their CB race bike. If someone really wants more info, best to just give him a call on 061 0408 639 666.

Offline bear

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Re: H-Beam Rods
« Reply #19 on: February 12, 2023, 09:33:08 am »
I've been down the " Big Stroke/Short Rod" path year's ago and it didn't end well for me. :(
The older I get the faster I was.

Offline MRieck

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Re: H-Beam Rods
« Reply #20 on: February 12, 2023, 01:07:38 pm »
I've been down the " Big Stroke/Short Rod" path year's ago and it didn't end well for me. :(
I bet.....the ratio gets a bit on the funky side. ;D
Owner of the "Million Dollar CB"

Offline Tracksnblades1

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Re: H-Beam Rods
« Reply #21 on: February 13, 2023, 02:51:39 am »
I've been down the " Big Stroke/Short Rod" path year's ago and it didn't end well for me. :(

Oh Bear…
I’m glad, I know what you’re sayin here.
Dang stroke and rod lengths can be misconstrued
For an unflattering double entendre.
🤪
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Offline Ellz10

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Re: H-Beam Rods
« Reply #22 on: February 15, 2023, 07:55:21 am »
What do Carrillos cost?


They're around $1.5k now. I snagged mine from Ken at CycleX almost 2 years ago when he was doing some work for me and I paid $1.1k
Thankful for everyone on this forum. Grateful to continue to learn so much.



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Offline paul_cb836

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Re: H-Beam Rods
« Reply #23 on: February 16, 2023, 12:10:07 am »
Cycle X are now also using the RPE rods in some engines. I think they list the weight somewhere on their web site.