Originally posted by trbig
The 78's and 79's had smaller valves but more compression and hotter cams. The 80's and above had larger valves, but less compression. They made up some of the compression with a higher domed piston, but it didn't make it all back. later, the XJ uses a YICS (Yamaha Induction Control System) so a tube was added to the top of the cylinders to incorporate this.
Basically from the bottom of the cylinders down and out to the back wheel are the same.
Some things did change ON the motors, but the guts are all the same. The only thing I can think of that may have stopped the shaft chine action.... is a little less power?
The average person will never feel anything from the driveshaft. The only time I have ever noticed it is sometimes in a wheelie, it will pull the bike to the right some. Both tires on the ground... you'll never know anything about it.
Tod
The 78's and 79's had smaller valves but more compression and hotter cams. The 80's and above had larger valves, but less compression. They made up some of the compression with a higher domed piston, but it didn't make it all back. later, the XJ uses a YICS (Yamaha Induction Control System) so a tube was added to the top of the cylinders to incorporate this.
Basically from the bottom of the cylinders down and out to the back wheel are the same.
Some things did change ON the motors, but the guts are all the same. The only thing I can think of that may have stopped the shaft chine action.... is a little less power?
The average person will never feel anything from the driveshaft. The only time I have ever noticed it is sometimes in a wheelie, it will pull the bike to the right some. Both tires on the ground... you'll never know anything about it.
Tod
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