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CB125T, EX250 commuter, Ninja 250 racebike, CBR250R(MC19), VF500F, CBR600RR, VFR750F
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Many things can be out-of-whack leading to rich fueling. Test and measure following according to steps in service-manual:

  • ECT & IAT sensors. Measure at ECU connector to also test wiring in between
  • fuel-pressure in fuel-rail. Might be failed FPR
  • O2-sensor, failed one will indicate full-lean to ECU, which will inject additional petrol to compensate

Since it started with fill-up, you may have gotten bunk tank of petrol. Dump it all out and refill from different station with octane-grade recommended by manufacturer.
 

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CB125T, EX250 commuter, Ninja 250 racebike, CBR250R(MC19), VF500F, CBR600RR, VFR750F
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Spilling? Outside of bike? Should've stayed at refill station on ground.

Yes, EVAP canister can be damaged by too much liquid petrol. Don't overfill tank, up to little screen on inside only. Although there is separate vent-line for over-filling that should drain to ground.

If you have super-sniffer, you can try turning off bike after it starts smelling, then moving it into different area and try to sniff out source of leak?
 

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CB125T, EX250 commuter, Ninja 250 racebike, CBR250R(MC19), VF500F, CBR600RR, VFR750F
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841 Posts
Usually you can disconnect canister and remove. Air it out couple days in hot sun and that should dry it out. Not likely EVAP because it's only vented back into engine once bike's warmed up and under some load (moving down road).

Too rich at warm-up has more to do with warm-up cycle in ECU. It might be getting erroneous data about actual outside temps. Amount of cold-start enrichment at 20F may be 2-3x more than at 70F.
 
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· Registered
CB125T, EX250 commuter, Ninja 250 racebike, CBR250R(MC19), VF500F, CBR600RR, VFR750F
Joined
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841 Posts
O2-sensor doesn't come into play until engine is warmed-up.
 
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