EXHAUST PIPES

[dirtsquirt74]

Looking for an exhaust pipe for a project bike. What is the difference between a model 96 and 99 exhausts? They have different part numbers.

[Bullfrog]

They have a different fit up to the exhaust manifold on the cylinder.

Model 96 fits with a large nut which screws on to the threaded exhaust manifold of the iron cylinder engine.

Model 99 slip fits onto the exhaust manifold of the alloy cylinder Road Toad engine.

Ed

[Zyx]

Without taking dimensions, it is impossible to say what a non-stock pipe will do for your machine. Although Hodaka exhaust systems are not the most technical pipes on the planet, all expansion chambers have a dramatic effect on performance. You can drastically change the power curve with a pipe change, without changing the porting. There is more to the equation than whether the pipe bolts up. All may work if you are not demanding in the result, but it an expansion chamber for a reason, as opposed to simply an exhaust pipe.

The Harry Taylor pipes are an example. Compared to stock systems, the HT series are night and day different, and have a huge amount of tech time behind them. So if all you want is something that works, you can cut and weld a pipe mount to whatever pipe you have and it will work. But it is really hard to predict how well it will run or if you will lose, gain, or be net neutral on power output and the point in the rpm scale where power is made.