WHICH IS FASTER (50 CC NON-RESTRICT OR 125/150 CC STOCK)

[0BARK4322]

I WAS JUST WONDERING IF YOU DE-RESTRICT A 50CC (BOSS DRIVE/REV ONLY) WILL IT BE FASTER OR SLOWER THEN A 125CC SCOOTER------HUMMMM

[zombie]

Quicker to "launch" but 10mph or so less at the top. Mine will outrun any stock 150 scoot!

[ts1]

I some EU countries 125cc are limited to 80kph for under 18 years. In this case a strong 50cc may be faster downhill squeezing out (and risking!) it's engine.
But usually 125cc are unrestricted too and can utilize their <=11kW/15hp. Top speed then about 110kph.

I own a small 125cc with "only" 7.5kW/10.2hp. It looks small and from the front and side like a 50cc, some people like to race me. But it outperfoms every 50cc scoot I have ever met. Once they see my tail with the big number plate, they give up. 150% _more_ displacement (unrestricted anyway) is nothing to take lightly, even if it's "only" 4-stroke.
In switzerland the 50cc may legally run unrestricted if the driver has license class A1. The strongest 50cc has 4.2kW and a top speed of 78kph. Compare this to 11kW and 110kph.

We have an 125cc class with >11kW too, for driving license class A. 4-stroke may reach 20hp (Peugeot Satelis K20), 2-stroke 23hp (Aprilia RS 125).
Who thinks, an unrestricted 50cc can compete with an unrestricted (but stock!) 125cc of 20hp and more? Who's unrestricted 50cc runs true 120-130kph or even more? "Speedometer tuning" doesn't count!

[zombie]

My xz/50 Super fever! Now I couldn't touch a modified 125-150. But any stock 125-150 is lunch meat for me. Your right about the K-20! That is one mean little machine.

[0BARK4322]

SO WHAT IS THE TOP SPEED OF A STOCK 125CC IN MPH AND IS IT HIGHWAY LEGAL

[zombie]

Some 125's will get 50-60, and 150 will get 55-65. Yeah believe it or not a 125 is legal on ALL U.S. roads because it requires a motorcycle endorsement. Although I would NEVER get on an Interstate with anything less than 400cc's. You have to think about AVAILABLE HP. if you are topped out at 60mph; How do you avoid trouble? I live on HWY 98 (the redneck Rivera) and I try to stay off of it because of people doing 70mph in a 55 zone. Ps. The best my ZX has done is 65mph, and not on MY clock. Right now I can run 55mph all day. (about 5/6 throttle) still have more but can't hold it at full. It will drop off.

[ts1]

SO WHAT IS THE TOP SPEED OF A STOCK 125CC IN MPH AND IS IT HIGHWAY LEGAL

Stock 125cc 11kW can have official 120kph = 75mph. Typical for scooter is "only" 110kph = 69mph.
But the fastest stock 125cc makes 135kph = 84mph (17kW, but street legal with Euro3 emission class).

The fastest 50cc I have ever seen with own eyes was clocked with 210.634kph = 131mph (1965 FIA world record on Bonneville flats). Of course this was not an usual 50cc.

[zombie]

Holy Cra#, I had to use the conversion program to understand your post. I don't want to get into a bidding war! All I can say is my Super Fever is faster than Al Deimeiola! John Wayne"s horse has NOTHING on this!!! I do believe I have the best margin of speed/ reliability I can get out of a 50cc scoot. (70cc) And just to finish; I have three letters on my brake light...   F.T.P.  Ps. I do want to build a Super 9. 131mph for a 50cc base sounds do-able. Of course it is a throw away! 70mph all-day.

[ts1]

Sorry for using non-si units. I will continue with kW and kph.
Ok, the power and speed mentioned in the last posts are official numbers from our laws and authorities, no "bidding war".

Does you scoot have a 70cc racing cylinder? Then I wouldn't call him an "non-restricted 50cc". Over here it would be - just illegal.

[axy]

If you have 3 kW 50 cc scooter and 7 kW 125 cc scooter, regardless of restrictions and transmission tweaking, at the end, you will have just that, 3 kW vs. 7 kW.

[0BARK4322]

KW--WHAT !!!!----WELL IF YOU DE-RESTRICT YOUR REV-LIM, DO IT MEAN THAT IT WILL ALWAYS GO TO RED LINE----AFTER CHANGING MY BOSS DRIVE THE REV WILL NOT GO ALL THE WAY I THE RED ZONE--IS THAT NORMAL

[zombie]

Yeah my scoot is completely modified. That's the comparison I was trying to make. Modified vs de-restricted. You are absolutely correct that side by side de-restricted HP is the bottom line. I couldn't swear to it but I am pretty sure I am near 13 HP. For obark, even at full throttle I don't get full rpms. There is a point where torque falls of, and you just can't get anymore out of it. Maybe on a long downhill run?

[ts1]

Yeah my scoot is completely modified. That's the comparison I was trying to make. Modified vs de-restricted.

The title says 50cc non-restrict vs. 125/150cc stock. Now it's completely modified vs. de-restricted?

A comparison "modified without rules" vs. "strictly street legal" is quite difficult if you want to arrive at conclusions. Better to change as few parameters as possible.

[axy]

Stock 125cc 11kW can have official 120kph = 75mph. Typical for scooter is "only" 110kph = 69mph.
But the fastest stock 125cc makes 135kph = 84mph (17kW, but street legal with Euro3 emission class).

The fastest 50cc I have ever seen with own eyes was clocked with 210.634kph = 131mph (1965 FIA world record on Bonneville flats). Of course this was not an usual 50cc.

We had in Croatia a lot of 125 cc/25 kW (34 KS), but not scooters. For example, Cagiva Mito (http://www.motori.hr/CAGIVA_MITO_125_190.html) , Honda HSR, some Aprilias... it would be interesting to drive 125 cc/2stroke 34 hp scooter though.

[ts1]

We had them too. But not with Euro3 compliance. The new Mito 125 has: 9kW.