I have a 2000 v star custome 650. i have a weak spark on the front cyl,and no spark on the rear cyl.if i bump the rear cyl coil i get a full spark. how can i fix this..

SOURCE: 200 YAMAHA V-STAR 650 HAS

IT sounds like it is the pickups not working (.telling it to spark) if not then it will be CDI UNIT OR ENGINE GENERATOR COILS

SOURCE: 2000 V-STAR 650 YAMAHA CRUISER

1. #1 test. Obtain a 12 volt circuit tester, the type that looks like an ice pick with a wire coming out of the handle. With ignition on, hold the tip of the circuit test against the post of the coil, the post that is marked with a + The light in the tester should light up, meaning you have battery power. If you don't have electrical power there, trace back to battery to find out why. If you do have power at that point
2. Moving the the opposite side of the coil and place the tip of the tester again the post marked with a minus. With the key on, crank the engine. The light in the tester should flash. These 2 test have just tested your battery and ignition system. Bill

SOURCE: no spark from coils

These issues revolve around the Simplest items ( 8I recall chap had pulled Mach 3 apart , only to have His intended Father in LAW SAY >"WHY'S THIS SWITCH?-OFF?--He HAD BUMPED THE kILL SWITCH AS HE DISMOUNTED!---With that in mind "DISCONNECT , TEMPORARILY THE WIRE FROM THE KILL SWITCH & TRY!--Also, remove coils & Shine Evert Earthing Points, Throughout The Motorcycle., Then carry out Impedence Test Of Coils & DON'T forget the HT Caps , they can produce same woes!!--Remember to "Re Connect Kill switch Wire!--( SDometimes Ignition Swithes Faill Too!--Fact remains>Electronics are like box of matches, not all will light when struck with same force!--Stay Upright, Des.

SOURCE: installing a Pro 1 tachometer

look on stadium yamaha website you will see where they are

SOURCE: what are the spark plug gap settings for a 2000

Please rate this answer. Thanks!