150cc gas moped

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1. Motorcycles must be leaned in order to make turns. This lean is induced by the method known as countersteering. in which the rider steers the handlebars in the direction opposite of the desired turn. Because it is counter-intuitive this practice is often very confusing to novices

   Comment by Floyd — 05/12/2010 @ 3:15 pm

2. This depends mostly on the engine size. The smallest engines are typically 49cc and they can give up to 90 mpg. depending on what type of riding you do and how much you weigh. Obviously if you weight 300lbs and do mostly short stop and go trips you ll get a lower mileage than if you weight 100lbs and travel mostly on long trips at modest speeds. At the extreme. we ve seen figures of 110-120 mpg for 50c scooters when the rider was trying their best to drive as economically as possible.

   Comment by Kimball — 05/12/2010 @ 3:15 pm

3. What the carburetor does is regulate the amount of fuel and air which are supplied to the engine. To go faster you need more fuel and more air and they must be in the right proportion. The fuel also has to be atomized as much as possible (i.e. be supplied in tiny droplets). The carburetor controls all these functions and generally does it quite well. Without removing and disassembling the carburetor, there are only two adjustments you can make, but these should take care of most minor problems. The first is the adjustment of the idle speed.

   Above is a picture of a typical GY6 engine carburetor and the view is that from the right side of most engine configurations on 150cc Chinese scooters. There’s a small spring loaded screw which adjusts the idle speed. It’s right next to the throttle control which is connected to the twist grip on the right handlebar. On most 150cc scooters, idle speed should be around 1500rpm when the engine is fully warmed up. Don’t make adjustments when the engine is cold. Take a 5 or 10 minute ride first. When the engine is cold the automatic choke is in operation and that can change the idle speed. If you have a tachometer, setting the speed is easy. If you don’t, you want to set the speed to a low idle. Fast enough so that the engine doesn’t stumble or stall, but slow enough that the clutch doesn’t engage and try to move the scooter forward. On most scooters from 50cc to 250cc, this will be somewhere in the 1500-2000rpm region.

   The other adjustment you can make is to the low speed fuel/air (“mixture”) ratio. This is done on most scooters using a screw adjustment on the other side of the carburetor as shown below.

   This screw changes the air to fuel ratio at low speeds. It shouldn’t need much adjustment, but the way to do it is to turn the screw very slightly (1/8th turn) and see if the idle speed goes up or down. If it goes down, turn the screw back 1/8th turn to where it started, then 1/8 turn in the other direction and see if the idle speed goes up or down. If it goes down, turn it back to where you started since you didn’t need any adjustment! If the idle speed goes up, continue turning the screw in 1/8th turn steps until the idle speed is at a maximum. If it starts to go down, turn it back to get the maximum idle speed.

   Comment by master — 05/12/2010 @ 3:15 pm

4. My Scooter is Not Charging

   Make sure the fuse in scooter is good.
   Check the wires behind the fuse holder and the charging jack. Sometimes they come loose.
   My Scooter is Hard to Start?

   Is the spark plug dirty? Clean or replace it if its dirty
   Make sure the carburetor and the intake manifold are tightly secured to the engine.
   Check the gasket between the carburetor and intake manifold. Sometimes the gasket is bad and caused leak. Solution: replace new gasket or just toss the bad gasket away and screw carburetor back. Try to start again.
   My Scooter Bogs out When I Turn the Throttle ?

   Adjust the screw with the spring on the side of the carburetor. Clockwise to reduce gas flow and counterclockwise to allow more gas follow. Usually bogged down is caused too much gas going thru the carburetor.
   Give time for it to warm up.
   If that does not solve the problem, you need a new carburetor.
   My Scooter is Leaking Oil From the Carburetor & Muffler Areas

   Check the gasket between the carburetor and intake manifold. It might be bad or maybe the carburetor came loose due to engine vibration.
   My Electric Start Wont Work?

   Make sure the squeeze the left handle brake while pressing the electric button.
   When the electric start make clicking noise, it means your battery is weak
   Check the fuse.
   Is your key switch good?
   Is the electric start giving out a burnt smell? You might have a burnt out electric start. Sometimes there is no smell.
   My Engine Froze

   The cause is lack of oil getting to the piston and needle bearing areas. Certain oil cant cling on when the engine get too hot. As a result, the needle bearing fell apart inside and caused the engine to cease. You can buy a new a engine or try to rebuild it? Be sure to always maintain proper engine oil levels to help prevent this from happening.

   How Do I Adjust My Brakes?

   Brakes can be tightened by the handbrake area by the handlebar or by the wheel area.
   My Scooter is Not Holding Its Charge?

   Using the headlight, electric start and alarm (if applicable) too much will drain the battery.
   Gas scooter does have the ability to charge itself but slowly. An optional charger can be for $25 at any local automotive stores.
   Most new scooters would have a full charge and it would be display on the battery gauge. But in time, the batteries would loose their ability to hold a full charge. That’s normal!
   Sometimes charging the batteries too much even when they are not low. Most of these batteries charging cycle are around 250-300 times.
   Sometimes store your scooter away for a long period would cause that as well. If the battery power drops beyond a certain point, the charger would not recognize it. Sometimes you could jump start the batteries by using a higher Amp charger.
   My Scooter Has Problem When Running at High Speed

   If the scooter idles well and runs fine at low speed, but has problems at high speed, the problem may lie inside the carburetor with the main jet. The fuel/air ratio at higher speeds is set by the jets inside the carburetor and to get at them the carburetor has to be removed and disassembled. This can be a tricky job as the parts are small and delicate. The good news is that these carburetors are quite cheap. You can get a new one for $60-$80, so if you can’t make your scooter run smoothly and you don’t like the idea of taking the carburetor apart, you can always replace it!

   Comment by master — 05/12/2010 @ 3:15 pm

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