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Old CB77 Racer Help Needed

CYP77 - Police | Race Bikes | Choppers, Bobbers and Mods
Spargett
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Post by Spargett » Fri Feb 04, 2011 2:37 am

Thanks for sharing this, very cool bike.

Teazer, what's up with the manifolds on the carbs there? I have my Amal 626's bolted directly onto the stock manifolds which are significantly shorter as you know.

e3steve
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Post by e3steve » Fri Feb 04, 2011 8:05 am

Welcome along, John. Jerry is on your little island, down there in the SH; he's probably one of the first points of contact for definitive advice on racers.

Also, George (bech) and Rob (wombat200) are in Oz. Rob is particularly knowledgeable 'across the model range' on our old machines.

G'luck!

teazer
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Post by teazer » Fri Feb 04, 2011 8:05 pm

Spargett wrote:Thanks for sharing this, very cool bike.

Teazer, what's up with the manifolds on the carbs there? I have my Amal 626's bolted directly onto the stock manifolds which are significantly shorter as you know.
They look like the sort of adapters that Hap Jones and WEBCO sold back in the day. They are designed to space the carbs back from the head to maintain intake length. Race kit intakes were a long tube to replace the Air filter tube but race kit parts were not all that available, so maybe this was a simpler alternative.

Spargett
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Post by Spargett » Fri Feb 04, 2011 8:11 pm

As far as spacing between the carb and head, I know 26mm Mukuni's don't work on the superhawk's because they need additional space in the manifold to atomize the fuel properly. I only ask because I have those exact same carbs essentially bolted directly onto the head (stock manifold), and they function well. It got me wondering about the science at play here. Sorry if I'm staying off topic of the thread.

kawaa1r
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Location: Brisbane, Australia

Post by kawaa1r » Fri Feb 04, 2011 9:35 pm

Hi John,

Good score. I have the guts of a racer in the shed, but not like that one. Was this a Brisbane bike? If so you might go to the motorcycle sportsmen in Albion or QEMSC (which meets at the Motorcycle Sportsmen Bldg) http://www.qemsc.com.au/. Someone there may remeber it ot know something. I havent been involved with historic racing since being in Bris, but have met some of the guys who raced in the 70's.

Front hub certainly looks like GT750 Suzi - common 4LS brake for that sort of application. Backing plates are a mystery, some repro Honda 4ls backing plates came out of SA in the 90's. Those are certainly made to look a lot like Honda ones. Cant pick the cam actuating levers either. Handlebar lever is GT750.

Tank currently on the bike is a 'Kawasaki A1R'. I use apostrophes because its not identical to the A1R but is sold for that application. My understanding is they were made in Melbourne by Thermplas?? 'in the day' (time of the kawasakis) but are now made by Moto Tumbi on the central NSW coast. Looks like a Moto Tumbi tank as it has 'his' clear strip down the side.

I had some luck tracing a (non-yamaha) bike on the TZ250/TZ350 forum in other brands section. Tracked down the provenance of it and got independent verification of information I had. Might be more difficult for this one as it's a special.

Get it on the track. QEMSC have regular meetings or you could do the 'Cootha classic' would be a great showing for a 'local bike'. If the internals are as 'special' as the 'externals' then may not really rideable on the street perhaps.

PM me if you want have a chat.

Cheers
Ray

Fishcop
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Post by Fishcop » Sat Feb 05, 2011 7:40 am

Hi All

Thanks for the insight on this old bike :) If anyone wants better pictures of particular aspects, just shout.

Ray I've sent you a PM

Cheers
John

Fishcop
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Posts: 7
Joined: Tue Jan 11, 2011 10:31 pm
Location: Brisbane, Australia

Post by Fishcop » Sat Feb 05, 2011 7:43 am

Hi All

Thanks for the insight on this old bike :) If anyone wants better pictures of particular aspects, just shout.

Ray I've sent you a PM

Cheers
John

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