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Old 12-07-2014, 12:16 PM   #1
Bigbird OP
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Honda RC148 firing up

Found this you tube video of a genuine Honda RC148 firing up. This was Honda's five-cylinder, four-stroke, twin overhead cam with four valves per cylinder. Displacement was 124.8 cc. (33 mm. x 29.2 mm.) producing 30 h.p. at 18,000 r.p.m. Maximum speed: Over 135 m.p.h.
Check out the tach - redline is 20,000RPM! and it hits it toward end of the video.
Here's a first rate online article about the RC148 -

http://www.motorcycle-usa.com/289/15...nda-RC148.aspx

And here's the YouTube video -
https://www.youtube.com/watch?v=Xuvx...s_digest-vrecs

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Old 12-07-2014, 04:47 PM   #2
GalacticGS
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Wow! Must have pistons about the size of my thumbs...
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Old 12-07-2014, 04:57 PM   #3
Racer111v
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Quote:
Originally Posted by GalacticGS View Post
Wow! Must have pistons about the size of my thumbs...
"Two pistons would fit on a credit card with room to spare" 8 speed transmission
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Old 12-07-2014, 05:10 PM   #4
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Honda made some really awesome race bikes back in the 1960's. The 6-cylinder RC161 (I think that was the number) 250 had quite an amazing sound, there are several youtube videos.
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Old 12-07-2014, 11:11 PM   #5
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I'm actually in the background of this vid. George Beale's replica. For sale a few years back. (Maybe still?) Unbelievable sound!

http://m.youtube.com/watch?v=87rnH7xv05I
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Old 12-08-2014, 08:15 AM   #6
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Sixties Hondas

What's really amazing is that all these fantastic bikes were engineered before the computer! Or C.A.D. Heck, even before the electronic calculator! All this stuff was designed using a slide rule, paper, pencil and math.
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Old 12-08-2014, 12:15 PM   #7
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Quote:
Originally Posted by Bigbird View Post
What's really amazing is that all these fantastic bikes were engineered before the computer! Or C.A.D. Heck, even before the electronic calculator! All this stuff was designed using a slide rule, paper, pencil and math.
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Old 12-08-2014, 02:20 PM   #8
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Wink

In 1972 they had an engine torn down on display in a glass case at the Training Center in Atlanta. Absolutely amazing!
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Old 12-10-2014, 04:59 AM   #9
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My "Dream Bike"

After 48 years on two wheels, a bad accident made me promise my wife, kids and grandkids that I wouldn't ever ride again. But, I still have the love of bikes, and if I could have any bike in the world - just to own & fire up occasionally, to enjoy as one does a real work of art - I'd take an RC148. The technical aspects and shear beauty of that machine make it a true Work of Art, not to mention the fabulous sound of that 5 rteving to 20 grand! Ahh, my Dream Bike
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Old 12-17-2014, 10:00 PM   #10
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Don't forget Suzuki was also a player in the smaller classes about this time.

They did 50cc twins and 125cc square fours. Two-strokes so less complex but with a rotary inlet valve for each cylinder.

There was also the RP68, a 50cc V-3 with a 20K rev limit and a 14-speed gearbox. Banned by a rule change before it was raced.

A piston and crank assembly from that bike:



Which I lifted from a great old thread on ADV here. Lots more pics there, and well worth a visit if you are interested in small racers of this era. It also has video of Suzuki and Honda 50s in action at the Isle of Man.

This is alleged to be a vid of the Suzuki triple leaving the pits.



A few specs at this page. Bore x stroke: 28mm x 25mm.

I did read somewhere a quote from a rider of this sort of GP tiddler complaining that if the sun went behind a cloud while you were racing, the bike would slow because the the jetting was no longer right.
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Old 12-18-2014, 05:40 AM   #11
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Well done!
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Old 12-18-2014, 07:04 AM   #12
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What fun! Thanks for posting.
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Old 12-22-2014, 10:06 AM   #13
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Rob Ianocci on Jim Redman's 6 cylinder 250 Honda.





And here it is with Jim in the seat next to Don Vesco.



Jim.

These were taken at the Laguna Seca AMA races in 1997 when Rob and Team Obsolete got a round of vintage races added to the schedule.
My friend Roger Bell was running the whole Superbike Series so I asked him how much he'd charge to haul a bike out for me. It worked out and I got to race Steve Bennett's '72 750 SS Ducati.


Friday evening after practice and most the spectators had left, Rob started and warmed the 6 blipping the throttle and making a rasping shriek that made you cover your ears. When he shut it down there was a spontainious round of applause.
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Old 12-25-2014, 07:45 PM   #14
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The sound of that thing...
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