150cc motor bike

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1. 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.

   You may need to go back to the idle speed screw to lower the idle speed if it’s now too fast. So the basic procedure is to set the fuel/air mixture to give you the fastest idle, then use the idle speed adjustment to set the speed to the lowest rpm that gives you smooth running.

   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

2. Scooter Brake-In

   Different manufacturers recommend different break in procedures. For example most of our scooters manufacturers recommend the following:

   0-150km maximum speed 30km/hr
   151-300km maximum speed 40km/hr
   301-800km maximum speed 50km/hr
   801-1500km maximum speed 60km/hr
   Of course the speedometer is calibrated in mph and the odometer reads in miles, so some translation is needed. In round numbers these instructions correspond to:

   0-100 miles maximum speed 20 mph
   101-200 miles maximum speed 25 mph
   201-500 miles maximum speed 30 mph
   501-1000 miles maximum speed 40 mph
   What we recommend is to use the “ride it like you’ll ride it (but gently)” technique. That involves riding pretty gently for the first 25 miles (speed under 30 mph, revs under 4000 rpm), then changing the original Chinese engine and transmission oil. The original oil might be OK or it might be “cheap and nasty”. You have no real way of telling, so change it, then you’ll be sure. You may replace the original oils with Castrol GTX 10-30W in the engine and Castrol Hypoid 80/90 gear oil in the transmission. For the next 175 miles (25-200) you still should take it quite easy with no rapid acceleration, keeping the speed down below 40mph or 5000 rpm, then go ahead change the engine oil again. Since there is no real oil filter (the “filter” is just a mesh screen), changing the oil during the break-in period makes sense since it removes small metal particulates that the filter just won’t catch.

   During the break in period try to vary the engine speed as much as possible. This isn’t particularly easy with a CVT scooter since they tend to try to keep the revs pretty constant and change speed by changing the gear ratio. It is good to speed up and slow down and not ride at a constant throttle setting for long periods. Also avoid rapid starts and let the engine warm up for about a minute before moving off when you first start the scooter from cold to allow the oil to circulate. This is good advice even after the initial break-in period too.

   It’s probably not a good idea to use synthetic oil during the break in period. Good old dino (dinosaur!) oil is probably what you should use. Synthetic oil may be too slippery and not allow the parts (mainly the piston rings) to “bed in” properly. We suggest to stick with the manufacturer’s recommendation (typically 10-30W) until after the break in period of 500-1000 miles. Then you can switch to a synthetic blend if you want to. Amsoil make a synthetic oil which they claim is specially designed for scooters.

   Our break-in technique is to gradually increase speed over the next 300 miles (201-500) and at 500 miles do another oil change. After break-in, the engine oil should be changed at least every 1000 miles as part of normal routine maintenance.

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   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 ?

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

3. How Much does a Scooter Cost?

   Japanese and Italian scooters which are sold through authorized dealers, the price goes up significantly. For a 50cc scooter expect to pay around $3300 for something like a Vespa LX 50, which is a “classic” small scooter or something like $3000 for an Aprilia SR50 (fuel injected two-stroke) which is a little more sleek and modern looking. The classic Honda Metropolitan 50cc sells for around $2000.

   Going up to a 250cc, for something like an Aprilia SportCity 250 expect to pay around $4600, or $5400 for a Honda Helix. If you go to larger scooters like the Honda Siver Wing (580cc) you’ll pay $8100 ($8600 with true APS braking). The 400cc Yamaha Majesty sells for around $6100 and the Suzuki Bergman 650 will cost you $9000.
   How fast do Scooters go?

   Small 50cc scooters (“Mopeds”) are good for about 30 mph, maybe 35 mph in some states without speed restrictions. They will just about keep up with urban traffic, but you have to ride them WOT (Wide Open Throttle) do to that. This can be good for novices and young riders because in most of states the rider does not need a motorcycle license to operate a 50cc less scooter, but the inability to keep up with faster traffic can sometimes be a hazard as cars try to “squeeze” past you when there really isn’t room.

   150cc Chinese scooter. It might look fast, but it’s not really very happy above 60 mph. Mid sized 150cc scooters are good for 55-65 mph, though with a long enough run at it they may get up to 65+mph, especially if there’s a tail wind or slight downhill grade. 45-50mph is enough to keep up with most urban and suburban traffic, though it’s really not enough to flow with the traffic on a freeway, where speeds of 65-75mph are more normal. We?ˉd certainly recommend a 150cc scooter over a 50cc scooter for commuting unless you live in Manhattan. Most of the 150cc scooters cruise quite comfortably at 45-50mph.

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

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