If pistons are moving why does a scooter not move when the throttle is not pulled?
Gearless scooters employ a kind of transmission called as CVT (Continuously Variable Transmission).CVT makes your transmission disengage your engine from the wheel at low RPMs. Whenever you twist your throttle and engine revs up, CVT mechanism slowly engages the wheel with the engine. This is similar to clutch in the geared transmission, only difference is that the clutch engage/disengage occurs automatically in CVT, as opposed to manual in geared transmission.CVT system makes use of a belt connecting two rotors (sometimes called CVT rollers). In addition of providing auto engage/disengage capability, CVT also manages the gear ratio. You are ensured to get a good torque and later good top speed, while your engine keeps revving at the same RPM.Here is a nice article on CVT : Continuously Variable Transmission (CVT) Explained | Practical MotoringThere are also number of YouTube videos to explain CVT. Please have a look to understand the principle better.
Advice: Moving from a 125cc scooter to a 700 cc motorcycle?
I've been riding a vintage 1960 Vespa (125 cc, manual gear shift) for 3 years and now want to upgrade to a motorcycle. From what I've been reading, they recommend <= 500cc for the beginner bike. But I've been riding my scooter for 3 years now, and its taught me to ride defensively...especially since the old thing has no turn signals and crappy brakes :):). My heart is toward a 700 cc motorcycle. Should I go for that or should I still stick to a < 500cc like the Suzuki GS500?
Scooty starts but on acceleration it doesn't moves, what may be the the problem?
The only thing which comes as a curse in these scooties is less life in comparison to bikes. These give hell lotta practicality, easy ride, perfect A to B commute, but considering your issue i believe these below could be the reasons why your lill queen refuse to move fast:Power drop can be because of fuel supply disturbance. Do check the pipes and fuel pump in you scooty. Any obstacle in free flow of fuel can lead to cause fall in power.Do check your carburettor. Sometimes sediments can cause mall functioning which is not so good. A carburettor basically consists of an open pipe, a "throat" or "barrel" through which the air passes into the inlet manifold of the engine. The pipe is in the form of a venturi — it narrows in section and then widens again, causing the airflow to increase in speed in the narrowest part. Inside the venturi is a throttle slide — this valve controls the flow of air through the carburetor throat, thereby regulating engine power and speed.I suggest also inpect the drive belt of your scooty. Thats only movable part which gives power to the rear wheel. Any wear and tear beyond acceptable limits can make the machine lethargic.Air filter blockage is something which happens within and you donot know. Courtesy: no warning lights of signs in a scooty. Get it checked and replace. If its ruined by dust then air will hardly pass to the ingine and combustion process slows down resulting in drop of mileage, speed and fun.Check the gap of sparkplug. The ideal measurement can be reffered through manual book. Appropriate gap is very necessary for the ignition to come in play. Hindrance in such scenarious results a lethargic output.Since most of the scooties are based on CVT(Continuous Variable Transmission) and donot have physical gear or clutch levers. Chances of clutch plate wear and tear increases. Do get your clutch plate replaced if is not in goodbcondition.Do check the wheels and the movement on axel. The movement should be free and smooth. Get it cleaned and lubricate the essential part. This may help.
If i get a 150 cc engine moped, how fast can i go?
Generally, a 150cc scooter will top out at 55-60mph, given an average state of tune, but given your weight of 90lbs, the 60mph(maybe a "little" more) could be you regular top speed, with good maintenance practices. However, at 60mph, the bike will be operating in a wide open throttle condition. Meaning, there is nothing left. Steep hills are a pain in the... variator(trying to keep it clean) for most of the smaller displacement scooters. Riding solo on a steep grade, you will slow down, but on gentle grades you might not even notice a loss of speed. Road conditions and bike load are big factors when riding in hilly areas, and both variables are not listed. With two up riding on a scooter you will find your top speed greatly reduced. By how much? Again weight on the bike is an unknown variable, but what is known is 150cc. A 150cc engine will not make a lot of power even if it has been hot-roded and is in perfect working order. I own a Honda Reflex. The Reflex has a 250cc engine. I have had the bike at 80mph-solo on the freeway. With a passanger onboard the bike struggled to get past 65mph and was slow in responding to rider input. A 150cc bike with smaller wheels will be worse. While 150-250cc scooters are great for solo riding, they are not great for two up at high speeds. If you are looking to go riding with that special someone, concider the 400cc and up scooters for the best blend of power, safety, and comfort for two. Ride Safe
How hard is it to convert a 50cc to 150cc scooter?
I have a baja sc 50 with the qmb139 engine 49cc i found a 170cc gy6 engine and they seem to match up only difference is the 170cc case to shaft is 1 inch longer and the 170cc uses 2 shocks all bolts in same location the 170cc engine is a stroked and big-bore kit (11.8 HP)
Why will my scooter start, but not accelerate?
Depends what you mean by "accelerate". Do you mean the throttle makes the engine rev up and the bike doesn't move? In which case it sounds like you've broken your drive belt. (They have to be replaced periodically). Or do you mean the twistgrip turns but the engine doesn't rev? In which case you've probably broken the throttle cable.