The CB450 head can be used, I have a picture somewhere, I believe the stud spacing is slightly different, someone will probably come up with a definitive answer.MBellRacing wrote:Would one put the CB450 head up on the 500cc barrels then, or would it matter? I don't really see the benefit of twin cam when there's still only 2 valves per cylinder.
To Camshaft or Not to Camshaft....
1977 CB400F
1973 CL175 1976 XL175 - Sold 1964 CL72 1966 CA78
Got it. It's not required though, right? I am still curious about that. It seems like a pretty awesome little project. I have a master welder working with me now, so that portion is relatively simple.
On one of the other photos, showing the 6-speed conversion, why is the clutch and oil filter on the wrong side? Not really necessary, no. Jerry manages to make amazing race bikes with the regular 2 valve SOHC head. The DOHC heads are more to make a bike that looks like a CR72/77 which was DOHC 8-valve.
The 6-speeder you were looking at has the engine upside-down so the parts appear to be on the wrong side. A lot of welding and re-machining goes in to that project to get the parts from a later Honda transmission in there. Because of the shaft arrangement and the gear primary drive the clutch turns backwards compared with a stock CB77. G
Last edited by G-Man on Sat May 16, 2015 9:18 am, edited 1 time in total.
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
Great thread, I'm amazed at how far the limit is pushed, 500cc! Several yrs back I bought a CL72 from a scrapper it had a Connely Cam plate riveted to the point cover and CB450 carbs. I got it running using stock carbs and in the process broke three kickstart joints. When I pulled it down it had 450 sleeves, pistons, and Connley cam, I think it worked out to 412cc.
Ellis Holman built one using a GS400 Suzuki end, Les Barker of Little Engine Service in Vancouver, WA did all the machine work to make it fit. Talked to Les about the project yrs ago, quite a process! Something I don't see in my future but enjoying the stories and pictures!! Funny, just going through some old forum posts (2005) and found this, the last post in this thread. http://www.honda305.com/forums/are-roll ... e-t89.html Dick Johnson
'61 CB92 '63 domestic CL72 Type 2 '63 CL72 '65 CL77 '66 CB77 '67 CB450D '71 SL350 '71 XS1B
Just got off the phone with the good folks at Megacycle. To do the cams would be $399 (plus a core that I'd have to provide). Additionally, they highly recommend sending the rocker arms in to have them hard-faced. They're $74 each (x4 arms). So you're basically at $700 + a core (I see a set of cams on eBay right now for $93+shipping). For my particular application, they recommend #121-60, which is for 'fast scrambles, TT. Mid-range and top-end power.' This is because I already have the bog-bore kit, the racing valve springs with the titanium caps.
So I'll have to mull this over to see if it's worth the $$$ to have it done, plus the $$$ for John install it for me.
Well I think I may be taking the plunge, bit by bit. I just bought a set of used camshafts, and I have my eye on a set of rockers at the moment. This will likely be a winter project, but at least I'm acquiring the necessary parts to do the deed.
UPDATE -- the rockers seller just accepted my offer! So I have a set of those too!
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