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Steve
Steve, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 6828
Experience:  30+ yrs. experience, MMI, HD technician, HD early, engine rebuild/performance, bike builder, kit bike program manager, CCI 2001-2004
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Rear cylinder not firing excess gas coming out of exhaust.

Customer Question

Rear cylinder not firing excess gas coming out of exhaust.
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: Starts hard
JA: What is the model/year of your motorcycle?
Customer: 2003 flhpi
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Replaced coil ,sparkplugs and tested for spark and aim looking for break in wire
JA: Anything else you think the mechanic should know?
Customer: swapped out wire and it still .run on front only
Submitted: 3 months ago.
Category: Motorcycle
Expert:  Steve replied 3 months ago.

you provided a lot of information without specifics.

do both cylinders have spark? did you test with a spark tester?

tell me everything you can.

Steve

Customer: replied 3 months ago.
I have tested spark with a spark tester. Also tested crank sensor, Got rear cylinder to fire when I swapped wires and left front unplugged. and plugged in front and the front fired only. Replaced coil. Have new wires on the way. I have spark in both cylinders, but only one fires. I am going to try air sensor next.
Expert:  Steve replied 3 months ago.

your air sensor will make no difference.

your engine requires 3 things to start and run:

- spark (as in timed ignition)

- fuel (as in a proper air/fuel mixture)

- compression (as in enough)

if you have spark, your problem is one of the other 2.

Steve

Expert:  Steve replied 2 months ago.

let me know if you need more help.

if not, please leave a POSITIVE RATING.

thank you,

Steve

Expert:  Steve replied 1 month ago.

let me know if you need more help.

if not, please leave a POSITIVE RATING.

thank you,

Steve