MAN048ING26
10 EXHAUSTSYSTEM
Before every t est, make sure that the flexible is not damaged. Replace if
necessary.
ATTENTION:
Incasetheflexibleisdamaged,metallicparticlescouldbesuckedintheengine
andcauseaseizure.
Alwaysmakesurethatthespringsarewellhookedandinplace.Incaseofbreakage,
replace the broken spring. Never race the kart without the 3 springs in place, as
otherwisetheexhaustpipecouldvibratebeyondcontrol.
Every10 ¸15hours,open the pipeendandmakesurethattheholesontheinternal
counterconearenotplugged.
Thebestperformanceisachievedwithatotalexhaustlenghtof:
§ L= 410÷415mm.
WhereLismeasuredfromtheflangeontheexhaustheaderuptothefirstweldingon
thefirstconeoftheexhaustmuffler(seedrawing).
To achieve this dimension, the flexible (supplied with the engine) must be cut at a
lenghtof65mm(flexiblecompletelyclosed).
Havingfixedasprocketratio,itcouldbenecessarytoimprovetheengineperformance
eitheratloworathighRPM.
Thiscouldbeachievedbymodifyingtheexhaustlenght.
In general, by shortening the total exhaust lenght an improvement at high RPM is
achievedandviceversa,bylenghteningtheexhaustlenghtthelowRPMisimproved.
When testing, never exceed in lenghtening or shortening the flexible by more than
5mmpertime.
11 CENTRIFUGALCLUTCH
Theenginehasalowmaintenancedrycentrifugalclutch.Thefollowingprescriptions,if
carefullyfollowed,willallowalongclutchlife.
When starting the engine make sure that the brake pedal is fully pressed to avoid
suddenaccelerations.
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