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CYP77 - Police | Race Bikes | Choppers, Bobbers and Mods
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malcolmgb Member
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Joined: Mon Nov 07, 2011 11:52 am
Location: Midlands UK & Cleveland OH

Re: Fours on the 305 site!

Post by malcolmgb » Sat Nov 02, 2013 9:57 am

GORDON BROWN wrote:Hello

Jerry, just to say thanks for posting the pictures I had seen pictures of the "77" before but the new four is something else. Is the engine based on the CBX (400/550), there have been a couple of bikes showing up in the UK using them. I like the CR's they just look right unlike the later ones. What class can you race it in and are you planning to let Levi Day loose on it ?
It is a shame you need the silencer cans though.
I hope you have fun with it.


John Davies is producing replica 500/4 frames for Classic Racing here in the UK, you can't use the 400/4 because of the date cut-off, 72 or 73 I think, he has also done a 350/4.
1977 CB400F
1973 CL175
1976 XL175 - Sold
1964 CL72
1966 CA78

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Joined: Wed Oct 27, 2010 12:36 pm
Location: edinburgh scotland

Fours on the 305 site !

Post by GORDON BROWN » Sat Nov 02, 2013 6:47 pm


Malcolm, I had seen the Davies bikes close up at the Stafford, nice things and made to be eligible for the CRMC P2 / Manx regs. I think. That said they are still (highly modified) CB 500 /350's and they obviously work well in the right hands as 500's ( William Dunlop / 109mph IOM lap etc.) Don't think the 350's are as good as the twins yet though.
Anyway from the pictures Jerrys bike seems more RC181 like than CB500F like, 4 valve per cyl. etc. and probably longer "service" intervals than the big CB77 (plain bearing crank ?) should the moon as well.
Rules and regulations aside it looks like lots of hard, detailed, work has gone into it so far.
I would certainly like to hear (read) more details, if thats allowed on a Twins site ?



jerry Member
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Joined: Tue Feb 19, 2008 2:33 pm
Location: australia

Post by jerry » Sat Nov 02, 2013 9:23 pm

Dear All, Thank you for the compliments. Rules and regulations do apply in Racing. The 4 cylinder is being built to Australian 1982 Historic regulations. In this case the major component made pre 1983 is the engine which is a CBX400/550. The crankshaft, conrods, barrel and gearbox are CBX400 The rest is the same as CBX550. The cam cover is courtesy of Ronald Agoston. Building the engine is a bit different to what has been done in the past by others with the CBX engines.The ignition is via a geardrive to sit behind the cylinder barrel. The CBX400 bore has been increased from 55mm to 62mm using Honda 305 liners suitably modified. Using the CBX400 crank gives a 42mm stroke resulting in a capacity of 507cc. The rules allow +5% in capacity. The cylinder head is extensively modified with ports relocated and both inlet and exh. valves manufactured at 2mm O/size. The whole thing could end up being a bit of a screamer. This particular bike has been a bit of a saga to build as I have had to learn a lot about the different technologies used compared to the twins. Just the new sump has been a big job in itself with approx. 27 pieces and a total of about 8 feet of alloy welding. The bottom sump plate was machined out of billet with finning inside and outside. It keeps me off the streets. All the best Jerry

Stan Lipert Member
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Joined: Fri Oct 26, 2012 9:00 am
Location: Cleveland

Post by Stan Lipert » Mon Nov 04, 2013 5:31 am

G Man, I really like your bike, I can appreciate the period parts and execution.

Jerry, fantastic work as always! Thanks for posting the photos.


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G-Man Member
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Location: Derby, UK

Post by G-Man » Tue Nov 05, 2013 4:53 am


Thanks for the kind comments. It's a championship-winning bike (1994 350) and the last CB77 based machine to win. It has also been ridden around the TT course by one of the Honda UK guys during their 50th anniversary parade. My intention is to tidy the bike up but preserve it as it is.

I have been collecting parts to build up a similar bike but that will be built in the style of the 1960s customer bikes like the CR93.

I found this picture in Classic Racer yesterday. Wouldn't it be great to build a time machine and just hang out with these guys......

Ralph Bryans CR72 small .jpg
Ralph Bryans CR72 small .jpg (110.75 KiB) Viewed 8005 times
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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G-Man Member
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Joined: Wed Mar 25, 2009 5:17 pm
Location: Derby, UK

Post by G-Man » Fri May 30, 2014 4:14 am


I've seen bits of this before but didn't know it was a full documentary. Just a fabulous piece of machinery. I hope they know how to reassemble it!

We have Japanese friends visiting tomorrow. May ask them to translate.......

'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

Superchicken Member
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Joined: Sun Sep 16, 2007 10:10 am
Location: Turlock, Ca.

Post by Superchicken » Fri May 30, 2014 3:20 pm

G-Man, thank you, Honda did a wonderful job of showing us everything. Great camera work and explaining everything, on the disassembly of the entire 250 six. Long but worth watching

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