Top speed By jwolfie001 (Read 1,763 times)

[jwolfie001]

I am curios, what is the top speed of a stock scooter? I have purchased a used 150cc scooter and after a little tune up, I am able to run 45-50mph. Is this normal?

[Bashan]

45 to 50 is in the ballpark for a 150cc. I had a Bashan 150 nudge 60 with slightly heavier variator weights but then you lose some low end....always a trade off. There's guys that regularly get into the 60's and Steven at MonsterGY6 says he's topped 70 and I don't doubt that for a second......go look at his site. The one thing I'd have to say about our little 10 HP pals is that they are a lot more influenced by variables than a larger engined vehicle. You put a 220 LB rider on an identicle scooter next to a 180 LB rider and you'll see a huge difference in speed. Put them in the same auto and not so much if at all. If you can hit 50 MPH I'd say you're doing allright. Rich.

[jwolfie001]

Kansas city is about 1100 ft above sea level. I am a short squatty 180 pounder.

[Alleyoop]

Welcome Jwolfie001,
Good to have you on the forum. If it is brand new it will pick up in speed a little. Little heavier weights and maybe a Performance variator it will run in the 50s.
Again Welcome and ride safe
Alleyoop

[mauiboy]

My 'junker' rocket A 150 will hit an indicated high 60's so around 60mph downhill. In reality (all indicated speeds, subtract 10% for real) on the flat it will hit 55mph, uphill into a headwind it will hit mid 40's depending on the gradient. Uphill without a headwind it will hit 50. Temperature plays a part and I have about 40 lbs on you and I'm 6 2 so probably act as a sail. This is on 13 inch wheels on possibly the worst 'roads' known to man or beast.
If you haven't ridden on a scoot much before be very careful with higher speed cornering. As the engine and CVT is effectively adding to unsprung weight dealt with by the back wheel. On a 50cc scoot it isnt a huge issue, on a more 'powerful' 150 you can have some moments in the corners. I was acting like a 6 year old last week and took a corner at around 45mph indicated and as it was night and scoots have virtually no lights i missed spotting a palm branch on the roads and ran over it. Basically the suspension is worthless and I had a seesaw moment where I got lateral squirming on both wheels but mostly the rear. It was possible to hold the bike on line and complete the corner but it could have been worse. 150cc is just enough to get you in trouble

[Alleyoop]

OK, OK, let me straighten this SPEED CRAP out, my 150 ICE BEAR trike will do 120mph every time I throw it off the Grand Canyon, now it all depends on the wind though and if I take a few of the WEIGHTS out of the Variator.
Alleyoop

[mike6736]

Ally...mine would be faster............cause its weight is more....Sounds to me these guys need to check speeds by GPS's....And we wonder why or how some think these 50cc do 50-60 stock and 150s running 55-65 stock....

Still have not had one pass me one my 300cc that will cruse at 60 - 65 Mph =By GPS. With that said, I know some 300cc triks just like mine that will not do 65 WOT....

3 cents

Mike

[Cruiser]

Alley, I think that is an excellent result for top speed, but I would think you would want to add as much weight as possible to the variator as well as to all available hollow spaces including the gas tank in order to get consistent top speeds.

[mauiboy]

I have done a couple of runs to check with gps but I don't do it frequently. 55mph indicated is 50mph on the gps.

[mcalli]

I don't understand why everyone gets such low speed on their 150's. My roketa mc-74 150 does 70 wot on flat ground, even in 20mph sustained winds. Since I live in Ohio where it is relatively flat, there are no high grades to test on. but on small hills, it still goes 70. This is according to the cheap speedometer, but it is also according to my expensive gps unit. Unless the mc-74 (which is cheap chinese) is better than all the 150's you all are talking about, I don't see why mine goes so much faster. It goes 70 when someone up to 160 lbs rides it. Don't know about heavier weights because no one heavier than 160 has ever ridden it.

[runningslow]

I weigh in the neighborhood of 250lbs myself, and ride a 189cc (161QML)... the best speed recorded is 63mph on my gps-calibrated Sigma bike speedo. But, my average is usually around 50-55 in steady winds. However, I think my rpms are only in the 6500rpm ballpark. I think some heavier weights and some taller gears in the rear end could easily bump that up.

I'm skeptical of any stock 150 going a true 70, but maybe the lightweight rider can make that big of a difference. Stranger things have happened.

[mthomas]

Probably because you weigh 120lbs. wet. Add another rider to your bike and see the difference. I do feel that is slow for a 150. Mine would do 55 with my 250 lb. ars and hit 60 downhill.
Alley, mine would go faster if I stayed on it while going off the Grand Canyon.

[goodrosnemesis]

My Jonway 250 will hit 85-90 on a downhill. I can sustain 70 on a gentle (2-3%) uphill grade. I live in Utah, so I have hills a-plenty to test on!

[mauiboy]

one thought may be if the OP lives somewhere hot and is running 20w50 or something similar because of the heat the top speed is likely to be lower, by how much I have no idea.
The basic premise that a 150 should be able to hit a true 50mph on the flat under normal conditions is pretty sound (with an average sized driver). I checked last night and I can get 68 indicated (62 actual?) flat out downhill, thats around 8500rpm indicated which rings true with the rev limiter. I'm 220lbs. The svelte mcalli no doubt can go a lot faster, being 100lbs lighter will help a lot.
Basically a 150 with 8hp on a good day can make 50 under most normal conditions BUT add in anything like altitude, an extra 100lbs weight, a headwind, an incline etc it drops. As mentioned above they have nothing in reserve, mine runs WOT a lot of the time (which cannot bode well for engine life). A stroker crank upgrade might improve things. IIRC if would add more torque (or rather proportionally more torque than hp) which should assist with maintaining speed in hills \ headwinds \ carrying loads.