10000rpm

[NewbRider15]

I have a 50cc 4 stroke automatic moped. It doesn't do anything fast but if i can get a good bit of down hill i can hit 50. But it starts to make an awful noise if it goes over 10000 rpm. 10000 and under its fine.

Is it a problem or is it just that the engine cant cope at revving that high?

Newbish question i know but i'm still learning. Cheers.
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Now on - 1986 Kawasaki ZL400 Eliminator (33bhp restricted)
Own - 2009 Huatian HT50QT-25 Scooter

[N cee thirty]

D: since when did mopeds have rev counters D:
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[NewbRider15]

my one is special
Not really, its slow!
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Now on - 1986 Kawasaki ZL400 Eliminator (33bhp restricted)
Own - 2009 Huatian HT50QT-25 Scooter

[N cee thirty]

all 4 stroke 50's are slow

you should be happy with 50,most 2 strokes don't get that

my mates 50 struggles to 35
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Killer Rat]

At least you have got a rev counter. My 125 has de-restricted gear-change markings on the speedo, which i've had to adjust with pieces of flourescent stickers.
I think..i'm no expert mind you..if the engine sounds whiny then change down/up a gear.
On my bike it's a case of as soon as things start to rattle/vibrate i change gear.

Hope this helps

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[N cee thirty]

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[N cee thirty]

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[N cee thirty]

[FURBAR]

YOU'RE BIKES SHIT IF IT DOESN'T HAVE A REV COUNTER AND ITS GEARED

No, mine has no rev counter and is a very tidy litttle beasty .. m fer !!
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Fuk um !!

[Alexio]

In response to the original poster:

If you're going to keep your engine near it's maximum power and highest revs possible for a long time in it's highest gear what you ought to do is get a different sprocket for it minus a couple teeth. It shouldn't change your top speed much (in fact getting there ought to be slower) but it will be better for your engine.
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will never give up his CG. I look at my fuel gauge more as a progress bar than a fuel gauge.
G: With my GSXR I do often effectively use it as a scooter with a clutch in town.
ms51ves3: why does it need 500 miles? Are you teaching it how to be a piston?

[ms51ves3]

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[Alexio]

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[Alexio]

[Digitalize]

[Wafer_Thin_Ham]

Can't you change the rollers to get more top speed, giving you a similar effect to changing the sprockets on a "proper" bike.

In answer to the OP. The sound you're hearing is the sound of the powerband hitting supersonic speed. I suggest a more beefy powerband. Possibly a red one up from the standard blue. (I don't think 4 strokes would be able to take advantage of the pink powerband.)

HTH.
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My Flickr

[27cows]

I used to have an SS50. Didn't have a rev counter but I estimate it revved to at least 12000rpm. My vision used to blur at around 55mph Was an exceptional bike for a 50 and could do over 200mpg if you pottered about on it. Wish I still had it. I did about 8000 miles of hysterical high revving and it never did it any harm.
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The RXS100: vehicle of choice for Chuck Norris

[Alexio]

[rob_scott92]

[Kal]

*sigh* And it had been so long since I had gotten involved in a flame war.

[chris-red]