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Damrongsak

Nice little 50 cc bike ...

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555 I don't go that fast at BIRA.

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Posted (edited)

Is the speedo kph or mph?

Edited by papa al
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KPH. Maxed at 160. Not bad for an engine not much bigger than a strimmer/bush whacker. Amazing bikes , those Krielders.

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"Kreidler Zigarre" (50 cm³, record: 210.634 km/h 23 October 1965, Utah, USA)

 

image.png.6f4cec19f1fdf6e42160b0df135d2a42.png

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50cc mayhem, coming to a quiet soi near you.  Angry bees! Crazy!

 

 

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I've been looking into these 50 cc bikes the last few days.  Pretty amazing. They will do about 160 kph, but it takes about a 14 speed gearbox to keep one in the power band, which is about 15,000, +/- 250 RPM. They got to about 350 - 400 horsepower per liter.  Wowie, Zowie!

 

The 80cc and 125cc were cool.  Not as hard to drive as the little ones. 

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Posted (edited)

Nowadays, street bicycles can have 18 or 21 gear-ratios/speeds.

Fancy aero one do 144kph +

 

Edited by papa al
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Posted (edited)
12 hours ago, papa al said:

Nowadays, street bicycles can have 18 or 21 gear-ratios/speeds.

Fancy aero one do 144kph +
...

I saw somewhere where one record attempt wasn't successful because a bug got splattered on the shell.  Must have screwed up the aerodynamics. (I hope it didn't take out the camera!)

Edited by Damrongsak
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And this is the era when we got crappy looking bike engines, all covered up in fairings. 

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I love those little bikes. I was lucky enough to see a 1960s Honda 50cc GP racer. 50cc four stroke, 2cyl, 110lbs. A jewel.

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On 6/29/2020 at 9:43 PM, papa al said:

Is the speedo kph or mph?

doesn't matter - when they've used a 'bicycle' speedo! 😄  

 

'sounds' like the speed was irrelevant - when its REVs that give the buzz

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On 7/8/2020 at 2:55 AM, Damrongsak said:

Suzuki had a little rotary valve twin 50 in mid-late 1960's that was pretty good.  They developed a 50cc 3 cylinder V engine (RP68) that was supposed to debut in 1968, but the rules changed to single cylinder only. 380 BHP/liter.

 

380 BHP/Liter...40 years ago | Adventure RiderSuzuki 50cc triple (7) | Suzuki RP68 | teamheronsuzuki | Flickr

is that another name for RCV? - which effectively turns a 2 Stroke, into a pseudo' 4 stroke

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