Questioner gives no indication where the noise is coming from, but it COULD be an indication of a failing CV (constant velocity) joint.
its loose tighten the pulley
The transmission on a SAAB 900 is mounted directly on the bottom of the engine. That clanking is likely coming from a broken tooth on a gear.
motor mount
if its a knocking noise whilst turning or in really bad cases constant then one of the half shafts constant velocity joints is probably failing due to the rubber gattor
If it is a front wheel drive it is most likely the driveshaft. Otherwise look to see if the spring is bottoming out
Try using a higher octane gasoline in this ATV. Many times the pinging is due to not using a 91 or higher octane fuel. A lower fuel like 85 or 87 may not be burning off as efficiently as the 91 octane which in turn will cause the pinging.
drive by wire throttle causes the wrench light to come on... can be temporarily gotten around by stopping car, and turning it off and on, but a dealer should still check it to be sure nothing is permanently wrong
Abruptly stopping aerobic activity can cause blood pooling in your lower extremities or making you feel lightheaded.
The main causes of stopping breathing are status asmaticus, cardiac arrest, resp arrest, overdoses, lodged foreign body in throat, strangulation, aspiration to name a few.
The pressure ratio does not cause pinging in an internal combustion engine. Pinging is the result of the air/fuel mixture igniying before the piston is in the propper position. Chep gas will cause pinging because it is igniting too quickly. Too high a compression ratio will do the same thing. Ingnition timing that is too far advanced will do the same thing. Back off your ignition timing two degrees at a time until the pinging stops, or buy a higher octane fuel.
Europeans...
by the retina turning fatigue