towing:
if you tow, above idle, what happens is the same thing as turning on your house water (hose) to the ski without having the ski running.
99.9% of boats use water to cool the exhaust system. if the engine is not running, water will be forced places it does not belong. if the ski is not run right after this, you could get water stuck in the engine.
Page 293 of 2001 shop manual:
Towing the Watercraft in Water
Special precautions should be taken when towing
a Sea-Doo watercraft in water.
Maximum recommended towing speed is 24 km/h
(15 MPH).
When towing your watercraft in water, pinch the
water supply hose from the jet pump housing to the
engine with a large Hose Pincher (P/N 529 032 500).
This will prevent the cooling system from filling
which may lead to water being injected into and
filling the exhaust system. Without the engine running
there isn’t any exhaust pressure to carry the
water out the exhaust outlet.
CAUTION: Failure to do this may result in damage
to the engine. If you must tow a stranded watercraft
in water and do not have a hose pincher
be sure to stay well below the maximum towing
speed of 24 km/h (15 MPH).
Snugly install the hose pincher on the water supply
hose as shown in the following illustrations.
CAUTION: When finished towing the watercraft,
the hose pincher must be removed before operating
it.
the photos are all in the manuals.