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Old October 12th, 2019, 03:11 PM   #31
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

Posts: A lot.
MOTY - 2018, MOTM - Nov '17
Just fact that it fired up confirms flywheel triggers, pickup-coils, igniter, ignition-coils, coil-wires and spark plugs are working. So no need to test or measure any of those.

Remaining concerns are:

- VRM working to charge battery?
- determine petcock status?
- carb adjustments correct?
- why is it not idling on its own?

State of battery charging is biggest issue as it would be wasted money to buy yet another one. So, keep trickle charger connected full-time 24/7 until we confirm VRM status. Fully-charged battery should be 13.8v on charger. Keep testing battery regularly.

To confirm VRM and petcock status, we need bike to idle on its own, so temporarily adjust idle screw to keep bike running so you have hands free to use multimeter to measure voltage while bike is running. So we’ve got 2 of three tests done:

1. Measure voltage at rest before cranking = 12.6v, which is good, fully-charged rested battery

2. Measure voltage while cranking = 11.5v which is also good, battery has good reserve capacity

3. Measure battery voltage every 2-minutes with bike running. Need to get bike running on its own to determine if battery is being charged. This test is most critical and needs to be done before anything else or we’ll drain new battery and destroy it.


If you don’t want to adjust idle screw, install cruise-control that locks throttle in open position. Or use velcro strap to lock on throttle in open position for at least 5-minutes so bike can fully warm up.

One purpose is to test VRM and other to blow out all Seafoam and accumulated junk in exhaust. Then we can determine if that smoke is coming from junk in exhaust or from inside engine. Not uncommon for bikes that’s been sitting to smoke when finally revived. If
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