Ok i have a 99 400 scrambler for my wife . When its in the mud somtimes you can hear and feel the chain popping. Is it to loose or is it an effect of the mud and dirt in the sprockets and chain.

 

Loose. My 95 Sportsman will do the same if the chain gets loose and I play hard.
Ingoldx1
95 Sportsman
99 Trail Boss

 

I think the 99 Scram has concentric drive. If it does, you should only have 3/16th of an inch deflection at proper tension.

 

jamie just another reason for u to sell it, you wouldent want your wife riding something that could breakdown? lol im sure she likes the sportsman better.

 

Definitely a loose chain, the noise is caused by the chain skipping over the top of one of the sprockets. Also, you may want to check your sprockets for "hooking", the wearing of the sprocket on the leading edge. As the sprocket wears your sprocket teeth will look like a wave cresting on the ocean. If it looks like this it is time to replace the sprockets and chain. Then you will be set for another 2,000 miles.

The wear ratio is usually two front sprockets for one rear sprocket.

 

I've got a 1997 scrambler 400 4X4 and had the same problem, Chain was loose. I tightened it, and it never did it again.

David

 

Piggy, whatz-up? Those tention settings are pretty sensitive. That 2000 xplorer rider that I ride with keeps over tightening his chain and speed is reduced.(Due to Drag) So just tighten a wee bit and test. With they way you ride there's no telling what you've done! LOL Polcat