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Steve, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 6979
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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02 Road ....63k miles....stalls out during a ride & after

Customer Question

02 Road King....63k miles....stalls out during a ride & after easy restart, it runs a bit rougher than normal, and seem sto lack a bit of acceleration when getting on the throttle. Also, once in awhile, will backfire on hard acceleration from 1st to 2nd gear. Mechanic says it may be O2 sensor or map sensor....battery is good, codes are clear.
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Steve replied 1 year ago.

a 2002 Road King has no O2 sensors.

the MAP sensor has little to do with the air/fuel mixture and is not likely the cause.

the most common causes of your issue are:

- changes to the air cleaner and/or exhaust without tuning the fuel map.

- problems with the engine temperature sensor.

- problems with your battery and/or charging system. (if I had a nickle for every time someone with a bad battery told me the "battery is good", I'd be a very rich man)

in cases like yours, I prefer to check the battery/charging system first. this is the easiest check to perform and doesn't usually cost anything.

if you would like my help in narrowing down your problem, measure the battery terminal voltage under the following conditions:

- ignition OFF.

- ignition ON.

- with the start button depressed.

- with the engine at about 2,000 rpm (fast idle).

let me know if you need more help.


Customer: replied 1 year ago.
bullshit.........battery was checked when running and when not........ya didnt help at all, and I will be asking for a refundand I didnt appreciate the attitude about ppl asking abt you know all the answersu dontnice try.....another 'guesser'im buyin a f**kin Honda
Expert:  Steve replied 1 year ago.

best of luck with your problem.

I'll be opting out..


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