This spark arrester when added to the R-77 Yoshimura muffler will allow the user to pass the 'stick test' required in some riding areas. As a byproduct the Decibel output of the motorcycle will also be greatly reduced.
Yoshimura R-77 mufflers are used on: (Click to follow link)
This item is not reccomended for carbon cased mufflers for long or hard use periods. (Carbon tip on stainless body R-77 is okay) Spark arrestors or 'DB Killers' restrict the exhaust pulses and trap the heat inside the muffler thus reducing the lifespan of the muffler packing. See here for packing replacement kits. (coming in a day or so)
In other words, in the exhaust world, you can rarely have your cake and eat it too. What this means is that when you are restricting decibel levels (a biproduct of spark arrestors and DB killer inserts), you are also restricting hot gasses escaping from the motor. This in turn reduces the lifespan of the internal packing of muffler and if the user does not increase the frequency of muffler packing replacement, the outer casing of the muffler can be damaged from blown packing. A sign of blown packing can be a hotter than normal muffler casing or discoloration of the outside of the muffler. Particularly on the forward side of the muffler. If these symptoms are ocurring, replace the packing immediately with a packing rebuild kit linked above. (We are not trying to sell you something, we are trying to make sure that your miles are covered in smiles)
Yoshimura R&D Announces New Video Series Highlighting The Company’s U.S.-based Operations Chino, California, April 4, 2016 — Yoshimura R&D of America today announced the launch of the first in a series of videos celebrating the Yoshimura legacy of designing and producing their legendary exhaust systems in America. This first video presents an overview of the heart and soul of the company: its workforce. For decades, everyone at the Chino, California-based company — from designers, engineers and welders to marketing personnel and management — has contributed in their own way to making the name Yoshimura synonymous with superbike racing. Today, the Yoshimura tradition of teamwork is thriving. Having started as a family business, the company culture promotes working in close collaboration. That is especially valuable when researching and developing products in the heat of competition. The benefits of successfully conducting race-proven R&D include an ability to instantly react to the needs of the racers who rely on Yoshimura for their exhaust systems as well as identifying and meeting the demands of American motorcycle riders. Enthusiasts as well as motorcycle dealers will undoubtedly enjoy this inside look at Yoshimura’s Southern California headquarters. It’s a welcome reminder that motorcycling at every level consists of a close-knit community of people with a shared passion for the sport. About Yoshimura R&D of America Yoshimura is “The Leader in Performance” and has been for more than 60 years. With unmatched skills, knowledge, and passion for racing, Yoshimura is on the forefront of the aftermarket exhaust industry. Yoshimura systems are race bred and feature the same legendary performance, fit and quality that has been their trademark for more than six decades. To learn more about Yoshimura and view their wide variety of performance products, visit www.yoshimura-rd.com.
Posted by Russell Hegler on 1st Sep 2017
I ended up needing a spark arrestor for riding on some national forest trails on my 2014 KTM 1190R. I ordered this spark arrestor to for my Yosh-77. Perfect fit! Sound levels dropped slightly but I have yet to ride it more than a couple of miles.
Posted by Unknown on 27th Sep 2016
I just bought my used 990 Adventure. It came with a Yosh exhaust, but it was not quiet. I liked the rumble, but it was just too loud. I didn't want to go to the DB Killer, and I'm glad I chose the spark arrestor. The rumble is still there, but at a tolerable level. Gotta keep the noise from affecting our riding areas. Big problem. This product did the job. I had one issue: while inserting the set screw, it dropped between the muffler and end cap. I had to take the muffler off and use a magnetic tip to fish it out. My bad though. A little duct tape to hold the screw to the wrench, and in she went. I should have done that the first time!