Yamaha Chappy 80cc Engine restoration Chappy Two-stroke Engine restorationhttps://www.facebook.com/RestorationEveryt. Find 1975 to 1976 Yamaha Motorcycles for Sale on Oodle Classifieds. Join millions of people using Oodle to find unique used motorcycles, used roadbikes, used dirt bikes, scooters, and mopeds for sale. Don't miss what's happening in your neighborhood.

Manufacturers used the numbers to identify the vehicles in the way they wanted until the 1980s. Yamaha wasn't an exception in this matter. Most of the manufacturers had nine months to implement this new rule on their assemblies. So if you plan to buy a bike of that year, the Yamaha VIN decoder can ask you to add a few more characters. The number was shorter, however, it can be decoded into the new VIN. If you buy a newer version of the bike, you will see a 17-characters code on the registration card that can tell you all the specs about it.

The VIN code usually starts with the letters such as JYA that refer to the world manufacturer code. The Yamaha VIN decoder will tell you that J stands for Japan, the country where it was manufactured. Y stands for Yamaha, the label of the company and A determines the type of the vehicle. We have a motorcycle in this case. If you see any other letters and the owner of the bike looks suspicious, you should definitely decode the full code to compare the bike you see with the data from the decoder.

Yamaha Chappy LB80 LB50 Kickstarter Spring Guide 1976-80 U7E 1972 Kick Lever 1W7-15664-00 free post US$9.99 Free Post (Worldwide) via Registered Air Mail (Sign-for). Is never released in France, it is found in 2 forms: a single seat from 1975 to 1977, dual seat 1977 -543: Last Chappy: it incorporates the features of the 551 (short saddle, small reservoirs code headlamps, etc.) but is equipped with a motor 4 to manual clutch transmission. Back This 1975 Yamaha Chappy has a 49 C.C 2 Cycle Engine & 3 Speed Automatic Transmission.

If you wish to buy a bike, the owner tells you the year, but the Yamaha ATV VIN decoder gives you another year, don't panic. The year in the code means the model year of the motor, but not the year when it was manufactured. Of course, it will be strange if the difference is more than a year or two. You can buy a new bike of the next year in autumn or in December of this year. It's a common practice of many companies.

VIN Location

The VIN code is placed on non-removable parts of Yamaha bikes. If you see any scratches or deformations, use the Yamaha motorcycle VIN decoder to check whether this number is genuine. If you see that such a code doesn't exist, don't buy this bike even if the price is too low. Let's take a closer look at the locations of the VIN on your bike. There are three main places:

• The right part of the head pipe or the steering tube (different names for one and the same part). Here you will see a shorter code for the models produced prior to 1982 or the 17-characters code for the models produced after 1981 and later. It's stamped vertically.
• Take a look at the left part of the steering tube to find the printed card with the code and some additional information. For the Yamaha motor decoder, you will need only the VIN code and nothing more. However, the actual year of manufacture is indicated there. And yes, the code is located on the both sides of the tube.
• The third place is on the case of the motor. You can find it next to or behind the clutch cover just on the right part of the motor. It's a small pad that's looking into the sky. Yamaha XJ550 models have the code is placed left to right while on other models it's front to back. The vintage Yamaha VIN decoder will decipher any code from any location on the bike.

The Yamaha VIN decoder ATV will tell you the information about the type of the engine, its specs and the type of fuel you can use. You should compare the code on the registration card with the code on all the locations on the bike. If you see any difference, it means the bike was repaired after an accident. If the codes are the same, the bike has its genuine parts that were produced in Japan.

Yamaha Sample VIN

• JYARM06YXGA002282 — 2016 Yamaha Fz07c - (689 cc), Motorcycle - Sport
• JYAVP32EXDA003396 — 2013 Yamaha XVS1300CT CT (1300CC), Motorcycle - Cruiser
• JYARJ16E0AA020429 — 2010 Yamaha YZF-R6 - (600 cc), Motorcycle - Sport
• JYAVM01E76A087480 — 2006 Yamaha XVS650 - (650CC), Motorcycle - Cruiser
• JYAVP02E42A018410 — 2002 Yamaha XV1600 AS (1602CC), Motorcycle - Cruiser

Yamaha Chappys were introduced as Honda released its small trail bikes. They were produced in the 1970's and early 1980's. The most common models are the LB50 (50cc model) and the LB80 (72cc model). The LB50s was usually known to have pedals installed into the swingarm, while the LB80s normally had the pedal system absent all together.

Model Identification

Because people often modify their Chappys for their own personal riding preferences, pedal existence alone should not be used to identify what model the bike is. On the left side of the engine near the cylinder's base, there is usually a small engraving that states the displacement of the motor, either 50cc or 72cc. The frame will also have a paper label behind the headlight stating the original motor's displacement, the manufacture date, and a VIN number.

edit : the manufacture date is more often the approval date of the model. first three character of the VIN are the version (and there is so much version across the world...)

1975 Yamaha Chappy Parts

Transmission

Both engine models include a 2-stage 2-speed automatic transmissions. Technically, there are 4 speeds all together, but the transmission may only be set to use either the lower two speeds (for extreme uphill climbing, trail riding, etc) or the higher two speeds (for all around on-road cruising). The gear selector (shifter) is located on the left side of the motor, just above the side cover. There is also a neutral gear.

1975 Yamaha Chappy Manual Parts

In order for the gear selection to be changed, the bike must come to a complete stop and the engine must have a very low rev. Shifting the bike while moving or reving the motor will usually not work, can be very dangerous (violent jerks often happen), and the transmission gears easily destroyed.

Starting

Due to the nature of the transmission, the Chappy is one of the few mopeds/scooters that can actually be bump started even through it is equipped with an automatic clutch. Since the kick starting mechanism is known as the bike's biggest weak point (along with the cable choke), most Chappy owners prefer to bump start their bikes. Bump starting the Chappy has not been proven to cause any type of transmission damage or failure when performed properly.

In extreme instances where the bike does not have an easy cold start, the bike is started easiest by bump starting in low gear ('L'), since the motor will be revving higher as the owner pushes the bike. Once started, it should be ran in low gear for a few minutes until it warms up, and then stopped, shifted into drive ('D'), and ridden normally.

An experienced rider will be able to pedal the bike (if it has pedals) to a slow speed (while in neutral), and then popping the shifter into either Drive or Low. Caution must be taken not to do this at too high a speed, or the transmission may get damaged.

edit : Late automatic models haven't low gear selector, and cannot start without kick starter, as the gear is in free wheel if motor isn't running.

Performance

There is a very large difference between the LB50 and LB80 models. While the engine's lower ends of each model are usually identical, the 50cc top end does not pack enough power to push the bike any more than about 21 to 23mph (depending on the rider's weight). The ride feels much like coasting a bicycle down a small incline. In comparison, the LB80 can get to about 35mph stock and packs enough power for the experienced rider to perform a wheelie upon take-off. A kit does exist from Polini to convert an LB50 to a 72cc displacement top end.

edit : The 50cc version with 4 speed manual gearbox (like swiss ones) ride about 40-45mph, stock, certainly the most powerful 50cc version of the Chappy, with an engine like a patchwork of other yamaha engine (pw50, yz80, rd50 and fs1 parts...)Euro 50cc 2 speed automatic gearbox reach 27-30 mph, and 30-34 for older models with moutain gear switch before the max 28mph law in most euro countries.Polini kit fit only on 49.9cc, and is a 62cc. It can reach more higher rpm, up to 7hp with bigger carb/intake/exhaust.Stock exhaust are the most performance limitation for 50 and 72cc.

Fuel/Air Intake System

Stock Chappys are usually equipped with a 19mm intake, a Mikuni Carburetor featuring a cable choke, a hose running to an air filter/air box, and a reed valve. There are two fittings on the side of the intake. One is for oil injection and the other is to vacuum fuel from the petcock. Since the original air filter for the Chappy is no longer available, it is recommended to replace the air box & hose with an aftermarket clamp-on filter. Care must be take into choosing a smaller one so that it does not interfere with the plastic cover above the motor.

edit : euro intake are 16mm. Polini kit can have a double reed valve from other yamaha bike without mod.. Original air filter is still available from Yamaha !

If replacing the carburetor, one must be selected that has a cable choke. If a lever choke is used, the plastic cover above the carburetor will either have to be removed or have a hole cut in it large enough to be able to reach the lever. The intake can also be converted to a 21mm and still function correctly.

1978 Yamaha Chappy For Sale

edit : most common conversion is with a polini 19-21 intake, with 17,19 or 21 pgbh delorto carb - phgb version need to have left side air screw, cable choke and 70° gas cable options. These need lot of jet setup, and less restrictive exhaust to run correctly.

Gas Tank/Petcock

Since the Chappy is not equipped with a fuel gauge, the gas tank features two 'pockets' near the bottom, each having their own outlet valve. Once the fuel has dissipated in the pocket with the active outlet valve, the petcock can be switched to use the other outlet valve (by selecting 'Reserve') and the bike can usually be ridden long enough to find a gas station.

The Chappy gas tank is capable of holding just over 1 gallon of gasoline.

Electrical

The Chappy's generator outputs three separate circuits, which are Ignition, AC Accessory, and one to charge the battery.

Ignition Circuit

1975 Yamaha Chappy Manual For Sale

The first is used exclusively for ignition. It is usually identified by a black wire with a white stripe, and runs to the external ignition module, the ignition switch (key switch), and the kill switch lever on the right-side handlebar controls. When the engine is shut off via the key or kill switch, the wire receives a direct line to ground and the entire circuit is therefore 'shorted'. This makes spark impossible and the engine will be forced to shut off.