faulty ignition coil? - Yamaha Raptor Forum

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Old 06-30-2009, 10:47 PM   #1 (permalink)
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Default faulty ignition coil?

ok guys when testing the ignition coil when testing the primary the ohms seemed to fluctuate alot and would hold alot higher than they should be. however the secondary side was reading just barely higher than the range they should have been in. so it would seem to make sense that it wouldnt be getting enough juice into the coil, but enough would be going to the spark plug. am i way off here? does the ignition coil definetly need to be replaced? should it still be getting some spark? cuz it was but has gotten worse and now no spark at all.
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Old 07-01-2009, 12:32 AM   #2 (permalink)
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Did you measure resistance with the orange wire disconnected?
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Old 07-01-2009, 11:55 AM   #3 (permalink)
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yes
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Old 07-01-2009, 01:24 PM   #4 (permalink)
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Does the resistance vary as you move things around or just over time with the leads held steady? I can't imagine a scenario (with a GOOD coil) in which the resistance should vary much at all either over time or by moving the wire around...

If the coil has a finite capacitance, then you should see the resistance change a bit over time as that capacitance charges up, but the measurement should settle out to a stable value after a short time.
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'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'02 Honda 400ex, DiamondJ +3 A-arm widener, Lonestar anti-vibe
3 scooters - 150, 180, 250
'73 Yamaha CT3-175 Enduro (currently under restoration)
'08 Can-Am Spyder SE5 - my Baby!
And the newest toy destined to suck up all my spare time and money: 2000 Jaguar XJ8
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Old 07-01-2009, 11:03 PM   #5 (permalink)
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k thanks sounds like a faulty ignition coil to me then.
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Old 07-02-2009, 11:46 AM   #6 (permalink)
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From your description so far, I'd agree. Any chance of finding a friend that will let you swap to test?
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'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'02 Honda 400ex, DiamondJ +3 A-arm widener, Lonestar anti-vibe
3 scooters - 150, 180, 250
'73 Yamaha CT3-175 Enduro (currently under restoration)
'08 Can-Am Spyder SE5 - my Baby!
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