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It is not difficult but it is a bit time consuming and may be awkward if you working by yourself. Remove the tailpipes. Remove the back wheel. Remove the swing arm. Then separate The U Joint at the transmission and then remove the yolk from the output shaft then you have access to do what you need to do with the seal

Hey Spencer, Because the rear master cylinder reservoir is vented, if the seal set in the master cylinder is compromised, it will introduce air into the rear/left front part of the brake system. A rebuild would solve this issue. While you are at it, look on Ebay for a MKII Rear master cylinder, do the rebuild on that, and just swap out the MKI rear master for the MKII rear master. The MKI rear master is slightly undersized to push fluid to two brake calipers in my opinion, and the MKII rear master is an excellent upgrade. The outside of the body casting is identical between the two masters, it's the inside bore that is enlarged on the MKII master. I have also seen the crush washer on the proportioning valve leak as well. I would tighten EVERY connection in the rear braking system before moving forward with the rear master rebuild. Hope this helps, Earl

I have had luck with reverse bleeding hydraulic systems on the bike. I use horse syringe and attach it to the bleeder and push it through the lines into the master cylinder.

I would start by bleeding them again. Could well have been an air pocket somewhere. But yes, if it’s been a long time since a flush and change, I would do that.

Note also the part about how Harley managed to block there progress in the US market which cost Yamaha big. History of the Yamaha Motor Yamaha Motor Company Limited is a Japanese manufacturer of motorcycles. Originally part of Yamaha Corporation. The company also manufactures other motorized equipment: all-terrain vehicles, boats, snowmobiles (see also Yamaha Snowmobiles), outboard motors, and boats. In 1887, Thorakusu Yamaha founded the company Nippon Gakki Co., Ltd. (since 1987 - Yamaha Corporation) for the production of Western musical instruments - harmonium, and later the piano. Soon the company mastered the production of metal components for these tools, and from the 1920s it also began to produce propellers for aircraft. In 1954, the Japanese government returned to Nippon Gakki a metal factory confiscated at the end of World War II. It began the production of motorcycles. On July 1, 1955, this production was spun off into an independent company, called the Yamaha Motor Company Limited, and its president was Genichi Kawakami, who also continued to lead Nippon Gakki. The first model, the Yamaha YA-1, copied from the DKW RT 125, was nicknamed “Aka-tombo,” which means “red dragonfly” (due to its simple shapes and chestnut-red color). It was the “Red Dragonfly” Yamaha owed its first sports victories: in the very first race at the foot of Mount Fuji on the YA-1, a victory was won. In 1959, Yamaha Motor began production of fiber-reinforced polymer (FRP) motor boats. In 1960, a subsidiary of Yamaha International Corporation was established, which began selling Yamaha products in the United States. In 1968, the company began producing snowmobiles, in 1975 - golf cars, in 1978 - snow-removing equipment. In 1964, a subsidiary of Siam Yamaha Co. was founded. in Thailand, motorcycle production was launched in Taiwan in 1966. In 1972, the headquarters was moved to Iwata. In 1976, the first Yamaha arc welding robot was introduced. By the end of the 1970s, having mastered the US motorcycle market, the Yamaha Motor Company ranked second in the world for their production. In 1981, the company made an attempt to oust Honda from the first place, having begun mass production of new models. Competitors answered in the same way, and Harley Davidson managed to impose restrictive tariffs on imports of Japanese motorcycles in the USA. Yamaha Motor Company was not ready for this, because, unlike Honda, it did not have its own production facilities in the USA; as a result, Yamaha Motor was left with a million unsold motorcycles, a debt of $ 1 billion and a net loss of $ 126 million. For the main corporation, Nippon Gakki, this had a limited effect, since at that time it controlled only 39% of Yamaha Motor's shares, and electronic musical instruments Yamaha enjoyed great success. In 1982, Yamaha Motor began a partnership with the French scooter manufacturer Motobecane (MBK), and soon Yamaha Motor became the largest shareholder of this company. Since 1985, Yamaha Motor began operations in India. Since 2001, India Yamaha Motor (English) Russian. became the full property of Yamaha Motor. There are two factories in India. In 2013, Yamaha Motor Research and Development India Pvt was founded in India. Ltd. and marketing company Yamaha Motor India Sales Pvt. Ltd. In 1990, the Yamaha Motor Company began a partnership with the Italian motorcycle manufacturer Minarelli, in 2002 the company became part of the Yamaha Motor. In 2015, Yamaha and the Italian sports car brand Abarth entered into a partnership agreement for the 2 seasons of the MotoGP World Championship 2015 and 2016. In November 2016, two joint products were introduced as part of the EICMA show - the Yamaha XSR900 Abarth motorcycle and the Fiat 500 Abarth Tributo.

I gotta say, they've had an eye for styling from day 1, IMHO. The YA-1 is a very cool looking bike!

Yes I will be there and looking forward to it.

Just be careful with the throttle, once you twist it to open you'll find it very hard to close again,,,, unless you need fuel or something to eat, then it closes just fine.