I'm having a few issues on my YZ80. First thing when I get into the power band in 2nd gear the motor starts cutting out(not exactly sure if this is the best description) and in the final gear I have to keep the throttle in a certain position to keep it in the power band. Also I've been seeing some sort of dark fluid coming out of the exhaust.(where the pipe connects to the motor) Is that something I should be worried about?? The other issues are suspension related. I think the fork seal is blown, how do I know for sure? How can I tell what type of forks I have? How can I stiffen the suspension on it? Any help will be greatly appreciated!