Yamaha RD250 Betriebsanleitung Seite 55

The engine overheats and the speed slows down.
a. Ignition timing incorrect. Have your dealer check timing.
b. Carburetor bypass clogged.
Have your dealer overhaul carburetor.
c. Carburetor or cylinder head loose. Retighten bolts.
d. A i r cleaner dirty.
Clean.
e. Chain needs lubrication. Lubricate.
f. Exhaust pipe or muffler clogged
Clean.
with carbon.
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