1978 Polaris RXL Service Manual, Page 30Get this manual
COMBUSTIONNORM AL and ABN ORMA (Con' l
The piston in Figure C, 00 Page 11, is the victim of scuffing co nd it ion which, lmost without fail, will appear he piston when severe deto na ion preign ition is enc ounteredIt can, however, occur singly because of loss of lubrica nt, improper piston bo re clear ance Of abnormally high combust ion tem peraturesIt, too, can cause preignitionEffects of high te mperature th spark plug is usua lly ind ica ted by clean whit insu lator core noseandor excessive electrode erosionIn almost ll cases, abno rmal oombustion can be complete ly elimina ted by{1} regul ar ma intenance schedu le wh ich includes proper une-up with particula attent io spark iming; (2) using spark plugs of the correc hea range for he engine and he type ru nn ing situation; (3) using suitable grade of lubrica nt in the cra nkcase for ycles and proper 2-cyc le oil in 2-cycle mixtures; (4) se lecting proper octane-rated fuel and maintaining correct mix tures in 2-cycle enginesnd (5) keeping ALL cooling fin functional fr ee from irtmud, il, and greaseAbnormal combustion ca be roo blesome and expensive but it ca be ave rted with prope ca re and attent ion given to he eng ine, the fu eland engine adjustments