1978 Polaris RXL Service Manual, Page 72Get this manual
GLOSSARY
Air Gap Spa rk Test:
A good check fo ignit io voltage and gene ral ign it io system co nd it ionSpark shou ld arc 318" minimu from end igh (several testers are available} tension lead to Elec trica generator roducing voltage alte rn at ing cu rren tBefore top ead cen te rCapaci tor ischarge ign it ionIgnit io syste wh ich sto res vo ltage generated by the stator plat exci te coi in capacito or cond enser (in COl box) At he proper moment voltage, generated by the stator plate pul ser co il, closes an elec tro nic switch (thyristor) in he CO bo and allows the vo ltage in the capac itor to ischarge into he pri mary wind ings of the ignition coilDista nce between center of crankshaft and ce nt er driven clutch sha ftPlast ic bu shing wh ich tr ansmits rotations of the clutch to the movable sheave in the drive and dri ven clutchesDrive and riven lutches are offset so tha drive be lt will stay nearly st raight as it moves lo ng he clu tc fac eThree levers in the rive clutch whichrelativ their we ight, profile, and engine RPM, cause he dri ve clutch to closeA wind ing of wire ro und iro co re which has he bility to generate an electrical cu rre nt when magne tic cu rren passes th rough itRu n-ou or "bend" cra nks haft measur ed with ia ind icator wh ile crank sha ft is supported betwee ce nte rs of blocks resting in lower ha lf of crankcaseMeasure at vari ou po ints espec ially at PTOThe spo ntaneous ignitio of th un burned fuelair mi xt ur after no rmal spark ignitio nPiston looks "hammered" through, ro ugh appea rance around ho leCauses1) too high co press ion ratio fo the fu el octa ne;low octane fu el; 3} over-advanced ignitio imingA cy linder measuring instrument wh ich used ial ind ica orGood for showing taper and out-of-ro und in the cylinder bo reCompression rat io measured fro after he piston doses the exhaust port(Open CircuitAn electrica circuit wh im isncomple teExampl e: Poor co nnections broken wire at l-lo beam switchResulNo head lightsIX-l