1975 70hp no spark

[tnstreamy]

Note this motor ran last summer and was fine but it would shudder then pick back up.
I looked for a symptom like mine and most pointed to stator, looked and mine was leaking!

I read a few fixes here and elsewhere and I thank all of you that have gone before.
I have tried some of the many suggested tests to determine what electrical isn't within specs.
I replaced my stator with a known good used one and nada? ok back to the tests :
Disconnected kill switch at powerpack X, disconnect Rectifier X,
Coils: primary to grnd ohms suggested 500, I get 750 up to 990. On secondary within spec .3 to .4 coils off the motor.
Trigger: blk/wh to all three wh/blk within suggested ohms, and stator brn to brn.org are within specs?

Coils if they read high ohms should they still spark? or no.
Is there a Power pack test?
thank you all for your advise

 

[boobie]

Go to cdielectronics.com for trouble shooting procedures. As a guess, throw a pack at it.

 

[emdsapmgr]

The pack is the most common ignition failure item. I start by testing the stator and the timer base, based on CDI's website cranking values. If they check ok, then I go for the pack.

 

[tnstreamy]

thanks will do.

 

[tnstreamy]

when checking DVA I assume that just cranking it over will do it?

 

[boobie]

Yes and it has to be cranking fast enough.

 

[tnstreamy]

thanks it does turn over good, my dva adapter should be here next wk, have a blessed Easter

 

[Bosunsmate]

Have you tried using a spark tester set at 7/16? That can pinpoint if one cylinders got a weak, intermittent fire

 

[emdsapmgr]

Another option when cranking-use an inductive timing light on each plugwire. That will also show spark quality/condition.

 

[tnstreamy]

hey guys here are the reading found my sheet finally: Coil 1=.3ohm sec, 2.99k ohm pri. #2 .3ohm sec, 1.99kohm pri, #3 .5 sec, 2.01k ohm pri.
trigger all 3 Wh/Blk to Blk/wh 7.5ohm, Stator 633 ohms

 

[SparkieBoat]

I do not usually rely on OHM test on outboard electronics. wait on your DVA adapter to get in..it is a quick and easy test and very dependable once you figure out how to do it. did you lose spark on ALL cylinders? if so did you try unplugging the big red wire harness plug and jumping the solenoid and checking to see if the spark came back? if it comes back then you could have a key switch/kill switch issue. sounds like a power pack issue though.

 

[tnstreamy]

thanks Sparkie I did remove the blk/yel wire on the bottom left of the PP, still no fire. Is that the same as what your suggesting?

 

[boobie]

Yes........

 

[tnstreamy]

Ok just ran voltage tests with DVA adapter..leads connected to PP: Stator seems in spec 180 - 330V,
Trigger (3) white/black leads top to btm: 1) 1.1v, 2).9v, 3)1.3v with blk/wh on meter ground.
DVA voltage from trigger - to ground oops didn't see that you should be connected to PP and ground.
Disconnect trigger leads from PP and test ohm from blk/wh to 1)7.7ohm, 2) 7.7ohm, 3) 7.7ohm
How can I test coils with DVA what I'm reading doesn't make sense. Primary is the lead to spark plug, then there is a ground org and an orange to PP.
Anyone have easy explanation?
thanks

 

[175se]

Primary is the orange to the pack.

 

[tnstreamy]

thanks 175se

 

[tnstreamy]

so the secondary is the plug wire I assume. I should get my replacement PP in next week. So I will have replaced from a running motor last summer the stator, PP. Hope the definition of Boat = bring on another thousand! isn't true...
thanks for all your help gurus

 

[SparkieBoat]

I check the stator power going into the powerpack and then the wires coming out of the power pack to the coils all to engine ground. If you got say 200 DVA going into the powerpack then say 50 DVA going to coils the pack is bad so long as your trigger checks out. and it looks fine. You should test your rectifier/regulator as well. disconnect the yellow wires and see if spark returns.
look here on page 34.
http://issuu.com/cdielectronics/docs...044661/2001100

there is a test where you check DVA between the brown to brown/yellow if the reading is low you then disconnect the stator wires, if the reading remains low replace stator if it is normal replace the powerpack. I remove all my plugs when doing these DVA test so my engine turns over fast.

 

[tnstreamy]

Got the PPack installed, fire in the hole wahoo,,,,, test and prep for water.... thanks for all the help...