How much does a motorcycle top end rebuild cost?
Costs for a motorcycle engine rebuild can range from $3,000-7,000. The cost estimate on the lower end may or may not include the cost of replacement parts that are needed for the motorcycle engine’s rebuild. The cost estimate on the higher end may include this cost, but neither estimate includes the cost of labor.
How long does a YZ125 top end last?
35-40 hours
We have seen up to 35-40 hours on a YZ125 top end but that’s stretching it a bit far and we wouldn’t recommend prolonging standard maintenance that long.
When should you rebuild a 2 stroke top end?
When you see dirt in the intake, you’ll need to tear down the top end to check for damage. A damaged cylinder may need reconditioning or replating. The same goes for when you find your intake boot and airbox was not sealed properly. Anytime you find leaks, you’ll want to tear down and inspect for damage.
How much does a top end rebuild cost for a 4-stroke?
A typical 4 stroke dirt bike top-end rebuild with a fresh piston, valves and timing chain will generally cost about $300-700 in parts. Labor is another $400-600.
When was the first Yamaha YZ125 dirt bike made?
1981YZ125. 1973: Although very few were actually made, Yamaha did produce a YZ125 in 1973. It was not offered to the general public, but a dealer in good standing could submit a rider resume to the importer and hope to obtain a semi-works bike. However rare, this goes down in the books as the first bike with the YZ125 name.
Why did Yamaha redesign the YZ250 in 1978?
In redesigning the YZ250 for 1978, one of the major goals of the Yamaha engineers was to improve its wayward handling. While some of the bike’s handling peccadillos were not going to be totally eliminated without a total redesign of the Monocross system, Yamaha reasoned most of them could be mitigated by beefing up the existing design.
What was the most significant feature of the Yamaha YZ125?
The most significant feature of 1982 was YPVS, the first power valve. 1983: This was a much better bike. Yamaha finally got the radiator off the steering crown where it adversely affected handling. The shock linkage was moved down, eliminating the crude pivot above the swingarm bolt.
What was the top of the line Yamaha yz250e?
In an effort to boost power, Yamaha designed an all-new top-end for the YZ250E. The new cylinder and head retained the air-cooling and overall displacement of ’77, but offered more aggressive porting specs.
1981YZ125. 1973: Although very few were actually made, Yamaha did produce a YZ125 in 1973. It was not offered to the general public, but a dealer in good standing could submit a rider resume to the importer and hope to obtain a semi-works bike. However rare, this goes down in the books as the first bike with the YZ125 name.
Is the Yamaha YZ125 similar to the Yamaha MX100?
It was, in fact, very similar to the MX125 and MX100, which Yamaha offered concurrently. The YZ125 sold for $110 more than the MX and had more peak horsepower and a number of lighter parts. Plus, it had the cool strap on the tank. At the time, Honda owned the 125 class with the CR125M Elsinore, but the two Yamaha 125s were at least in the game.
When did the 125 class dirt bike become official?
That changed in 1974 when the AMA gave the 125 class its own official championship. The only problem was a high school kid named Marty Smith who absolutely dominated the new class on a Honda for the first two years.
What was the name of the first Yamaha dirt bike?
At the time, Yamaha offered a YGT (Yamaha Genuine Tuning) kit, which had a ported cylinder, a high-compression head, a carb, a pipe and a new ignition that allowed you to get rid of the battery and starter. At the distributor level, Yamaha assembled a few of these under the AT-1 MX name. This eventually morphed into the Yamaha 125MX. 1981YZ125.