Advancing timing on gy6

blueboy5000 · 01-29-2016, 04:53 PM

The gy6 139, 152, and 157 all use exactly 750ml of 10W40 oil. The oil vent line must always be unobstructed, and allowed to vent to open atmosphere, or an "open" catch can.

Leaking crankseal after changing seal ( and most times, before changing crankseal) is 99% of the time due to worn crankshaft bearings.

Physically altering the magnets or pick-ups, or repositioning them, in the Hall-Effect igntion system is a bad and imprecise method that can damage the engine, and CDI. The best way to advance timing is to use an "advanced curve" CDI.

01-29-2016, 04:53 PM	#6
blueboy5000 Join Date: Jul 2011 Location: Connecticut Posts: 493	The gy6 139, 152, and 157 all use exactly 750ml of 10W40 oil. The oil vent line must always be unobstructed, and allowed to vent to open atmosphere, or an "open" catch can. Leaking crankseal after changing seal ( and most times, before changing crankseal) is 99% of the time due to worn crankshaft bearings. Physically altering the magnets or pick-ups, or repositioning them, in the Hall-Effect igntion system is a bad and imprecise method that can damage the engine, and CDI. The best way to advance timing is to use an "advanced curve" CDI. __________________ 2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats.
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