Author Topic: Hot 750 parts suppliers in the 70's  (Read 309 times)

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Offline Don R

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Hot 750 parts suppliers in the 70's
« on: December 30, 2025, 05:31:32 PM »
 I'm thinking of some of the old suppliers that aren't around at least for our parts. We know MTC is still kicking because they moved along with newer bikes as is Dyna, how about a few that aren't, like RC Engineering, Alphabet, Cir-Cycle, MPD, ARD, American Turbo Pak, Hooker motorcycle headers, Gerex, Lester mags, Henry Abe, I'm sure there are dozens of others.
 How about ones still making our stuff?
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Offline rocket johnny

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Re: Hot 750 parts suppliers in the 70's
« Reply #1 on: December 30, 2025, 05:43:49 PM »
i bought my first 750 in 73 .  a 750k-2 for 1500 bux with 4k on it . in those days the honda dealers in denver and salt lake could get all kind of fun parts .  bought my hooker 4-1 over the counter in salt lake . the old adage was the same then ,,   speed costs money ,,  how fast do you want to go ?

Offline gschuld

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Re: Hot 750 parts suppliers in the 70's
« Reply #2 on: December 30, 2025, 06:04:15 PM »
Interesting topic Don.

In no particular order:

CycleX of course, APE, Dynoman, Marine Crankshaft for custom stroke cranks, Good-Bits in the UK for the road race/CR750 crowd, Carpy, Racetech for front end stuff and shocks, Ikon shocks, etc for some current suppliers.  I think Honda OEM should get a special mention for continuing to supply a bunch of parts 56 years after the model launched. 

Mike Rieck and Rick Stetson have been a hard pair to beat for years on cylinder head work, up to full engine builds and chassis dyno testing if you are lucky enough.  Some lesser known talent like Jerry Berreth porting from the M3 days. 

Regarding businesses that FOCUS on the supply end of cb750s putting out a lot of options from mild to wild, with effort to bring new custom designed products to market, in the US it’s basically CycleX.  Outside the US, Good-bits in the UK mostly.  RPE does a bunch of mostly wild big bore road race engine work and supplies that type of stuff in Australia.  But cb750s are not his sole focus.

George


Online jgger

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Re: Hot 750 parts suppliers in the 70's
« Reply #3 on: December 30, 2025, 10:43:21 PM »
Umm, Hondaman. For those who still read books!
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Offline dusterdude

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Re: Hot 750 parts suppliers in the 70's
« Reply #4 on: December 31, 2025, 12:43:01 AM »
Is there a video?...lol

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Online jgger

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Re: Hot 750 parts suppliers in the 70's
« Reply #5 on: December 31, 2025, 09:13:43 AM »
Yes if you flip the pages REAL fast,
"The SOHC4 uses a computer located about 2-3 ft above the seat.  Those sometimes need additional programming." -stolen from  Two Tired

The difference between an ass kisser and brown noser is merely depth perception.  Stolen from RAFster122s

Offline MRieck

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Re: Hot 750 parts suppliers in the 70's
« Reply #6 on: December 31, 2025, 09:43:29 AM »
Interesting topic Don.

In no particular order:

CycleX of course, APE, Dynoman, Marine Crankshaft for custom stroke cranks, Good-Bits in the UK for the road race/CR750 crowd, Carpy, Racetech for front end stuff and shocks, Ikon shocks, etc for some current suppliers.  I think Honda OEM should get a special mention for continuing to supply a bunch of parts 56 years after the model launched. 

Mike Rieck and Rick Stetson have been a hard pair to beat for years on cylinder head work, up to full engine builds and chassis dyno testing if you are lucky enough.  Some lesser known talent like Jerry Berreth porting from the M3 days. 

Regarding businesses that FOCUS on the supply end of cb750s putting out a lot of options from mild to wild, with effort to bring new custom designed products to market, in the US it’s basically CycleX.  Outside the US, Good-bits in the UK mostly.  RPE does a bunch of mostly wild big bore road race engine work and supplies that type of stuff in Australia.  But cb750s are not his sole focus.

George
Thanks for the endorsement George. I don't know how much longer Rick will be doing work and I'm winding down too. I have projects I have to finish....like my CBX that has been apart for 10 years.😂
Owner of the "Million Dollar CB"

Online PeWe

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Re: Hot 750 parts suppliers in the 70's
« Reply #7 on: December 31, 2025, 10:09:14 AM »
Action Fours closed too early. They must have thought the bikes they created parts for had been parked for ever.
The old bikes back from the dead 20-25 years later, still ongoing. ;D
This from my view over here.

It feels like it is slowing down.
I have left 2 heads for refurbishment at my local shop 2 km away from my home.
One stock K1 head in need of guide and valve replacement.
Ported K2 head gets new guides too. Sunken and reshaped guides need some experience.

The mechanic and porting guy is working overtime. 75 yo.

I have ordered parts for future use.
« Last Edit: December 31, 2025, 10:19:13 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 Don R

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Re: Hot 750 parts suppliers in the 70's
« Reply #8 on: December 31, 2025, 11:59:20 AM »
 On eBay I'm seeing a lot of original parts in Germany, it makes me wonder if there was a warehouse of old stock sitting or where have these parts been accessed from?
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline willbird

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Re: Hot 750 parts suppliers in the 70's
« Reply #9 on: January 05, 2026, 06:05:41 PM »
Action Fours closed too early. They must have thought the bikes they created parts for had been parked for ever.



Surviving days next to days that turn into decades can bring regrets. One of them is throwing away an action fours four into one that had rust pinholes in the primary tubes. That header was magic because it went onto my CB750K2 under the boxelder tree in the side yard where I grew up. I'd like to have one in any condition to measure the primary tube dia and lengths.

Bill

Offline Don R

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Re: Hot 750 parts suppliers in the 70's
« Reply #10 on: January 06, 2026, 10:33:45 AM »
 My old buddy was an Action 4's dealer. I also own his old Dragbike header, I'll get it down from its garage hanger and see if it's an action 4's header.
 Edit: I don't see a name I'll need to pull it down from its perch to see iiiif I can find a name on the hanger bracket and get a photo.
 The header ID page is missing a lot of photos between them going away and photobucket's picture piracy.
« Last Edit: January 06, 2026, 11:22:21 AM by Don R »
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline willbird

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Re: Hot 750 parts suppliers in the 70's
« Reply #11 on: January 06, 2026, 11:27:09 AM »
Interesting topic Don.

In no particular order:

CycleX of course, APE, Dynoman, Marine Crankshaft for custom stroke cranks, Good-Bits in the UK for the road race/CR750 crowd, Carpy, Racetech for front end stuff and shocks, Ikon shocks, etc for some current suppliers.  I think Honda OEM should get a special mention for continuing to supply a bunch of parts 56 years after the model launched. 

Mike Rieck and Rick Stetson have been a hard pair to beat for years on cylinder head work, up to full engine builds and chassis dyno testing if you are lucky enough.  Some lesser known talent like Jerry Berreth porting from the M3 days. 

Regarding businesses that FOCUS on the supply end of cb750s putting out a lot of options from mild to wild, with effort to bring new custom designed products to market, in the US it’s basically CycleX.  Outside the US, Good-bits in the UK mostly.  RPE does a bunch of mostly wild big bore road race engine work and supplies that type of stuff in Australia.  But cb750s are not his sole focus.

George
Thanks for the endorsement George. I don't know how much longer Rick will be doing work and I'm winding down too. I have projects I have to finish....like my CBX that has been apart for 10 years.😂

If you ever want to write a book on what you know about working on the heads for the SOHC bikes I would love to buy one Mike.

Bill

Offline willbird

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Re: Hot 750 parts suppliers in the 70's
« Reply #12 on: January 06, 2026, 11:31:50 AM »
My old buddy was an Action 4's dealer. I also own his old Dragbike header, I'll get it down from its garage hanger and see if it's an action 4's header.
 Edit: I don't see a name I'll need to pull it down from its perch to see iiiif I can find a name on the hanger bracket and get a photo.
 The header ID page is missing a lot of photos between them going away and photobucket's picture piracy.

Somehow I just always knew the one I had was an Action Fours....I suppose we cannot take that as gospel. A buddy was always muttering how the pinholes "would bend my exhaust valves" which we now know is BS. I replaced it with a MAC and the what I think was action fours had much smaller primary tubes. I remember my dad rejetting for the action fours header and I had to rejet for the MAC...needed the needles raised, I had put pods on about 5 years prior and increased jet size then. The Mac "muffler" I had was just a straight pipe with one baffle at the baco with just maybe a 1" hole in the middle of it from memory. It sounded GREAT wound out in top gear for a mile or two :-).

Bill

Offline carnivorous chicken

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Re: Hot 750 parts suppliers in the 70's
« Reply #13 on: January 06, 2026, 12:10:02 PM »
I found an Action Fours 4-1 in a yard in Phoenix. This old guy Stan used to race flat track going back to the 1960s and had a yard full of bikes in various states, maybe 30 or 40, with a few inside (with his dogs, who 5hi7 and pi55ed all through his house). I bought a few things from him over the years, 350 tank, CL175 for the exhaust, then got what was left running with other exhaust, etc. But the exhaust caught my eye and I pulled it off the bike without knowing what it was, but intrigued by how the headers collected way in front instead of below. Sold it here IIRC. Once I knew what it was -- and the Action Fours made cams -- I wanted to go back and open up that engine but I moved to Mexico and that was pretty much that. Saw Stan one more time -- didn't answer his phone so I rang his bell, and he came out buck naked and disoriented. Looked at his old bikes, looked for something in the yard, and talked to him about buying one of the 550s he had in the house, but he wanted something like $2k for it, and turn signals and side covers were broken, tank was dented up, etc. Tried to reason with him, but he told me his brother had come over and they looked at things on the internet and he wanted what he thought they were worth. Last time I saw him, and it was 8 years ago. Don't think he was long for this earth. Tried calling him once or twice, but he never picked up, and thought about going back every time I was in PHX but never got to it. Engine might've had that cam, but I'm guessing everything was scrapped if he's no longer with us -- or his brother tried to sell his stuff.

Online PeWe

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Re: Hot 750 parts suppliers in the 70's
« Reply #14 on: January 06, 2026, 10:50:54 PM »
Action Fours SS1 cam worked fine. Very valve train friendly with less aggressive lift. My K6(836 + ported head) had almost 81whp with that cam. Also a good touring cam.
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 Don R

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Re: Hot 750 parts suppliers in the 70's
« Reply #15 on: January 07, 2026, 11:09:14 AM »
 My buddies old header seems to be a Mac, it's black and heavily ceramic coated. does have a muffler insert of some type. It has had something splashed all over it, maybe brake fluid that stained it.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline willbird

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Re: Hot 750 parts suppliers in the 70's
« Reply #16 on: January 07, 2026, 11:31:26 AM »
My buddies old header seems to be a Mac, it's black and heavily ceramic coated. does have a muffler insert of some type. It has had something splashed all over it, maybe brake fluid that stained it.

I have one of those, they DO last because mine has 30 years and 30K miles on it but I wonder if the primaries are TOO big maybe. They offer a different baffle for them too that might be better, the OEM baffle works well but it looks really weird, the tube is intentionally crushed almost flat. I put a Delkevic system on last summer...have the MAC in my collection. 1990ish it may have been the only system avail.

Bill

Offline Don R

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Re: Hot 750 parts suppliers in the 70's
« Reply #17 on: January 07, 2026, 03:31:34 PM »
 I agree, it was on an 1124cc stroker so maybe the 1.5" primaries are useful for that application. L0L! I re-hanged it on its perch in the shop. I have a few miles on a V&H header and then put it back in the box.
No matter how many times you paint over a shadow, it's still there.
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 You don't need a weatherman to know which way the wind blows.

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Re: Hot 750 parts suppliers in the 70's
« Reply #18 on: January 07, 2026, 09:11:30 PM »
My big fave back when (in Illinois) was Action Fours, except for their (too soft) cams. They had pistons in almost every 0.5mm step for all these Fours, with the only 825cc kit (64mm bore) for the 750 that I remember. When the [in]famous article about using CB750 pistons in a CB500 came out, they made some CORRECT pistons in the same size (not too long like the 750 versions were for that magazine conversion) and made hotrod CB500 engines practical. I used (then and now) Megacycle's cams as they are very durable for even touring use, if the lift doesn't get too tall, in these Fours.

While we experimented with the Mikuni carbs in the 750, they were a poor fit for the job, having to use a custom-ended 4-cable throttle rig at the time. The CR29 became the standard race carb for most of those who wanted it out of our shop back then.

By the 1990s the race parts were much more sophisticated for these engines, even though others outran them on the tracks here (Colorado).
See SOHC4shop.com for info about the gadgets I make for these bikes.

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