Topic: 500/550/650 pride (pictures added)

[turboguzzi]

if it's for our bikes, then it is surely a DIY job, dont believe that anything even existED, even back then, let alone now.

The logic is pretty simple, separate the plate's basket from the driven gear with a neck and put a seal there to keep the oil inside.

easier said of course, time, money, a CNC mill and late is all you need....

might be worth looking into newer stuff, maybe a ducati's setup could be canibalized.

TG

[paulages]

Well, we know with the full support of HRC, just about anything is possible. Still dunno if the 85ish hp listed is RW or crank.

Now, about that dry clutch... how the hell do I convert to dry clutch, where can I find out? Inquiring mind want to know.

you'd need a sealed primary shaft bearing, a seal at the kickstart shaft or plugged at least, the oilfeed in the mainshaft itself plugged (and some other way of oiling the pushrod)... it would not be an easy conversion.

[mlinder]

None of this crap is easy.
(I want this for a 350 twin, honestly, not a 4. I'm going to get another bottom end and see if I can do it over the next season while racing the wet clutch, and have it read for the season after. I have like, a year and a half to do it.)

[paulages]

None of this crap is easy.
(I want this for a 350 twin, honestly, not a 4. I'm going to get another bottom end and see if I can do it over the next season while racing the wet clutch, and have it read for the season after. I have like, a year and a half to do it.)

that is a known mod then, but you'd probably just about be money ahead just buying the henning coversion kit...

[bwaller]

Hey guys, no need to whisper, we can hear you ya know.

[turboguzzi]

Hey guys, no need to whisper, we can hear you ya know.

I think they are keeping it to themselves, these portland guys,

Nova makes the kit for the 450, should partly fit a 350 (and cost like an entire one too)

 

[turboguzzi]

anyone recognizes the basket?

[mlinder]

None of this crap is easy.
(I want this for a 350 twin, honestly, not a 4. I'm going to get another bottom end and see if I can do it over the next season while racing the wet clutch, and have it read for the season after. I have like, a year and a half to do it.)

that is a known mod then, but you'd probably just about be money ahead just buying the henning coversion kit...

But I also need to try and fit a 6 speed in there, Paul, so dunno how all of that will fit together...

[paulages]

None of this crap is easy.
(I want this for a 350 twin, honestly, not a 4. I'm going to get another bottom end and see if I can do it over the next season while racing the wet clutch, and have it read for the season after. I have like, a year and a half to do it.)

that is a known mod then, but you'd probably just about be money ahead just buying the henning coversion kit...

 
But I also need to try and fit a 6 speed in there, Paul, so dunno how all of that will fit together...

THE CB360 IS A 6 SPEED, BUT LET'S STOP HIJACKING THIS THREAD.

[paulages]

anyone recognizes the basket?

try posting it a size where we can see it? 

[turboguzzi]

anyone recognizes the basket?

try posting it a size where we can see it? 

smart boy, thing it's a crop of the picture above.. this is as "near" as i could get. still, you can see it's a nice job, he even put  an oil level sighting glass

[paulages]

   wish I could poke around that thing for a while. Ace tuner? Figuring out how to sqeeze a few extra HP with some factory parts (and a nice JMR port job) is nothing compared to swiss wristwatch-style japanese engineering. I wish I had a million bucks and a machine shop to play around with these things...four valve downdraft heads, gear driven cams..  

[turboguzzi]

I wish I had a million bucks and a machine shop to play around with these things...four valve downdraft heads, gear driven cams.. 

sounds like you need to get an early VFR 

[Bill/BentON Racing]

TG way too go ,,now thats a race bike,I think I got pic of CR500R somewhere,I will look,but look @ those manifolds more like it? Right on time for rebuild,WOW!!!!,Bill

[paulages]

I wish I had a million bucks and a machine shop to play around with these things...four valve downdraft heads, gear driven cams..  

sounds like you need to get an early VFR  

or the hailwood four. or an rc166...

i have a magazine somewhere with engine pictures of the mysterious rc166 (one of those GP multis anyway). if i remember right, the entire top end was gear driven off of the crank. the pistons were about the size of almonds. i'll see if i can find the article and scan it in.

[kos]

Yes a dry clutch like, almost, all the race engines from Honda. The Cr750 who needed a stronger, better, clutch did not get one. Shame on Honda, for that.

Honda RC750 Daytona bikes and the later CR750 Kit parts, were built to meet the AMA Class C standards of the time period and dry clutches, if not standard equipment were not allowed.

KOS

[kos]

Looks like a true race bike.

If a 500 (650) could have made 80 hp back then, I wonder what Honda could have done with the 750?

I wonder what Honda could do for the CB750


Easy...they did 95 crank HP on the most powerfull RC750 (with 25mm carbs)  raced at Daytona 1970. Funny thing...Dick Mann, upon Bob Hansen's urging took the lowest HP bike from the 6 at Daytona. 91 HP with the smallest carbs, 31mm Keihins. Pop's Yoshimura got a bit more HP, but his stuff back then was all very "hairball" scary and not what one would call reliable. Never finished a race in 1971.

Please Note: these were AMA legal 749cc engines.


KOS

[fastbroshi]

Bump, because this is awesome.  If you haven't seen these pages yet they're worth a look.

[Benelli]

TG,
 Is that a special tank, or borrowed from some other racer? Other than custom head tube angle and chromoly is the frame a stock? Did it say in the article who made it? The pipes would not be to difficult to make considering there is little, if any, taper and no flowing curves like the classic italian(beautiful) pipes. Like the MV Agusta and HB1 pipes. A few years back a crew of retired MV tuners showed up at Daytona with a pair of 500cc factory race bikes with open 4into4 pipes. It was the most beautiful thing I ever heard. It might have been the same day that Agostini was there riding the RC166 up and down pit road. Probably the two best things I ever heard.

HB

Hei H

the bike was made as an internal honda effort and built by the "R&D department in Saitama", at least according to the article. It was run in the All-Japan championship as "semi-works" but the tail still sports an RSC sticker. Hard to know the exact story as the bike was never raced outside of Japan (other than one race in 1982 in Italy when it was becoming already vintage). 
Everything on this bike is non stock, the frame has really nothing to do with the production item.
Maybe of even more interest is the second CB500 based racer (bellow) that sits in Honda's museum in motegi. Taken out to 750 with 66 X 54,76 dimensions and a special three valve head it developed 87 hp! if someone happens to visit the Honda museum, it could be really nice to have more pics and info on this one.

At the end of the day, I think that honda lost interest in developing the 500 based racers (which were way lighter ) due to the pressure put on by the z900 and the fact that big superbikes stole the limelight. There was more money to be made from the big ones.

Even if this second CB500R was more powerful, on looks alone I dig the first one I post much much more, that one was really raw.

TG

some more coments about these nice informtion (unfortunaly 5 years old).

The lattest 500R Racer runs with 3 valves each cylinder. Did anybody have more informations about this interesting cylinderhead?
Thanks
You can find it on the "Virtual Honda Museum"

http://app.mobilityland.co.jp/hch/search/english/?action_english_detail=1&productid=51&type=alpha&genreid=10&modelid=1


Anton