1985 force 125 intermittent spark

[Shifflett115]

get guys , I have an 1985 force 125 with intermittent spark , it will want to start , then you crank it again there is no spark , where should I start , compression is good , it ran great all weekend last weekend and now this , any ideas ?

 

[jerryjerry05]

Does this have a kill switch?
Depending on the manufacturer they installed kill switches starting in 85/6

Important test: test all 4 cyl. for spark..
Most only check the top cyl or 2 then decide there's no spark on any.
Then read the stuff I printed.

A regular analog gauge will do some of the tests, but a DVA meter will be needed for the more advanced.

outboardignitiondondotcom test procedures for your system.

IF NO FIRE ON ANY CYLINDER:

1. Disconnect kill wire AT THE PACK.
2. Check for broken or bare wires on the unit, stator and trigger.
3. Measure DVA voltage of the stator between the output wire sets. With everything connected, reading s should be approximately 180 volts or more. Resistance readings between the stator wire sets range from 680 - 800 ohms.
4. Disconnect the rectifier. If the engine fires, replace the rectifier.

NO FIRE OR INTERMITTENT ON ONE CYLINDER:

1. Check stator and trigger resistance, trigger wire sets read approximately 50 ohms between the wire sets (DVA-4V or more), stator reads 680-800 ohms (factory) and 200- 300 (CDI/RAPAIR) DVA 180V or more from blue to yellow.
2. If readings are good, disconnect kill wire from one pack. If the dead cylinder starts firing, the problem is likely the blocking diode in the other pack.