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No spark on #2 or # 3 cylinder - baffled
Posted: Sat Nov 12, 2011 10:59 pm
by vmaxmike
Bike was running fine a week ago. Now its only hitting on 1 & 4 cylinders when I started it today. (#2 and #3 exhaust pipes were not getting hot with motor running). I immediately thought ignition coil for 2/3 cylinder but the ohms reading (primary & secondary) checked out good within specs, in fact readings were same as coil for 1/4 cyl. Resistance on spark plug caps is good too. I switched out the Digital ignitor unit with a good tested spare one I had and same thing, no spark on 2/3. Any ideas on what else might be causing this?
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Wed Nov 16, 2011 8:18 am
by racerd14666
did u check for voltage at the coil leads? and the wiring to and from the tci box to the coils?
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Wed Nov 16, 2011 4:46 pm
by DonTZ125
Swap the connector leads to the coils. If the spark stays on the same plugs, it's the coils / leads / caps. If the spark hops to the other plug, the coil driver transistor in the TCI has failed.
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Wed Nov 16, 2011 6:19 pm
by olie05
I'm sure Don implied this but make sure you swap the spark plug leads to the correct cylinders along with the connector leads.
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Wed Nov 16, 2011 8:32 pm
by lamer
olie05 wrote:I'm sure Don implied this but make sure you swap the spark plug leads to the correct cylinders along with the connector leads.
I think Don understood that vmaxmike was physically looking @ the plugs (removed) for a spark, not trying to run the bike.
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Wed Nov 16, 2011 11:17 pm
by DonTZ125
Nah, I can see someone forgetting to swap their LT connectors back, then wondering why it runs worse than before ...
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Thu Nov 17, 2011 11:18 pm
by vmaxmike
crazy thing was after messing with the Caps and reseating the wires, 1 &4 stopped firing and 2 & 3 were good??!! So I checked for voltage at the coil leads and voltage was present on both. Long story short, it turned out to be bad plugs. I had'nt figured on this since they had less than 350 miles on them. Popped in new NGk's and it fired right up, running like a champ now.
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Fri Nov 18, 2011 1:46 am
by olie05
This reminds me... It's about time for me to change my plugs. Glad you found the problem!
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Fri Nov 18, 2011 5:17 am
by racerd14666
spark plugs dont go bad on there own, so i would take a peek at the carbs and clean / re jet as needed to solve the real problem
Re: No spark on #2 or # 3 cylinder - baffled
Posted: Fri Nov 18, 2011 8:36 am
by vmaxmike
yes, my thoughts exactly...otherwise same thing will likely happen again. Thanks