Nice little 50 cc bike ...

[Damrongsak]

Little 50cc road race bike.  Sounds good at 14,000 RPM.  There's just something about a bike where the tachometer starts at 8K RPM. 

 

 

[VocalNeal]

555 I don't go that fast at BIRA.

[papa al]

Is the speedo kph or mph?

[ktm jeff]

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

[Damrongsak]

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

 

[Damrongsak]

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

 

 

[Damrongsak]

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. 

[papa al]

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

Fancy aero one do 144kph +

 

[Damrongsak]

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!)

[Damrongsak]

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.

 

[Damrongsak]

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

[Loong Boon Mee]

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

[tifino]

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

[tifino]

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.

 

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