Mine comes up black every time it needs cleaning. Never really thought of what may cause it.Ye, dusty old logging roads. Like I said the dust is black not sand like. I guess I will clean it well after the snow falls then ride it a while and see, it should not need to filter out dust then right? If it's still black then it must be something else, running rich or belt dust?
Plan on doing that, and adding a small compressor too. Going to get a 2 up seat this winter too.Spend a little and get a good low pressure gauge. The ones that come in the tool kit are not always accurate. I've had two that read 1 1/2 lbs. different. I know, that doesn't sound like much, but when you are only talking 5 psi, now it's 20% different. That's quite a bit.