1990 90 HP Force (with '92 Power head) Presto ignition

[The Force power]

seems to be running on center-cylinder only
drop down test on #1 & #3 = no change

Replaced fuel pump's check-valves/diaphragms & all fuel-hoses
Have Spark on all Cylinders/all Carbs. full of fuel/ 150psi even compression on all / no visual defects found on Reeds.
Have timing & Carbs. lync & sync. as per instructions
Sprayed fuel in #1 carb. did not help nor pumping prime-bulb
Have not checked spark-gap or AC voltage output from Stater and or CDI

what am I missing & doing wrong

 

[foodfisher]

Fuel, compression, and spark. With your stated checks my money is on "Have not checked spark-gap or AC voltage output from Stater and or CDI". Check for broken connections hidden under shrink wraps.

 

[The Force power]

Fuel, compression, and spark. With your stated checks my money is on "Have not checked spark-gap or AC voltage output from Stater and or CDI". Check for broken connections hidden under shrink wraps.

Hi foodfisher,

I forgot to mention that I replaced the wire connectors on "most" I'll check replace the remaining to eliminate.
I'm currently not at where the motor is, so I'm trying to get a check-list together for when I'm up there.
Fortunately I have the factory repair manual, so I'm not completely in the dark

Symptoms;
It idles good in gear, but I can not get it passed a 1000 RPMs in gear, I pull the plug off #2 it dies instantly

 

[The Force power]

I forgot you to comment on your signature "When goals have no clear focus, neither will the actions of the people trying to achieve them"

I feel it applies to me! can't get my head straight
here's some food for thoughts;

Would an aftermarket voltage rectifier./ regulator cause a strain on the Stator and preventing to push out the necessary voltage to the packs? or am I just hunting for elephants?!?!?
either way I'll disconnect and see

 

[foodfisher]

Beyond my paygrade. Wait for jerry in the morning or nordin

 

[The Force power]

Beyond my paygrade. Wait for jerry in the morning or nordin

I'm probably grasping as straws, besides they the reg. runs off diff. winnings from the Stator

 

[Nordin]

Are the #1 and #3 plug wet when you pull them?
Seems like they do not get fuel.

Test by pull all plugs and ground them or activate the lanyard if you have one to be sure you do not damage the CDI boxes.
Hold a piece of white rag or toilette paper about 1 in behind each plug hole.
Set throttle by hand at half from WOT or a bit from idle (the neutral switch will be activated if you use the remote control).
Run the starter and check if you got fuel mist at the rag, if not you have a fuel issue in the carbs.

If you got fuel mist at the rag there is a igniton issue.
You stated there are spark at all three plug but will not fire at the #1 and #3 plug when in.

Then you have to check the DVA output from CDI box to the coils.
Should be 300VDC or more. Outboardignitiondotcom have troubleshoot chart or check your factory service manual for spec.

Maybe the coil can spark at atmosfer but not under compression.
Also check with a spark tester how far the coil can jump a spark, must be able to jump at least 1/4-5/16 in or more.

 

[jerryjerry05]

Wow, fire on all 3 but stalling when #2 plug's pulled???
Yet it runs good at idle??

What are the air screws set at on all 3 carbs?
Factory said 1 turn out and leave alone.
But sometimes they need to be out farther. ?

Test the strength of the spark, this tester or one like it is needed.
What plugs? NGK Champion? Gapless or gapped?
Spark should jump 1/2 -9/16 on the tester.
Make sure the coils connections are tight, a bad ground can cause problems.
What's the static timing set at?

Find FrankA's post called a Link and Sync.
If the carb linkage is off it can make it stall.

Any fuel coming out the carbs when running?
Take the plenum off and run it.
Nordins paper test, do it on the front of the carb too.
It should suck the paper against the carb.
If it pushes it away? the reeds are bad.

Clean the carbs.
Add a filter between the pump and carb.
Fram G2 G3 G12 all are plastic see through.
One tiny TINY piece of dirt can cause problems.
(1993 125 had a miss, cleaned the carb 3 times, saw nothing, still missed,4th time
It cleared up and ran great????)


Test for air leaks, can of starting fluid, start motor and spray around the intake side of the
powerhead, around the port covers and carb bases.
If this makes any difference? a gasket gone bad.

 

[The Force power]

Are the #1 and #3 plug wet when you pull them?
Seems like they do not get fuel.

Test by pull all plugs and ground them or activate the lanyard if you have one to be sure you do not damage the CDI boxes.
Hold a piece of white rag or toilette paper about 1 in behind each plug hole.
Set throttle by hand at half from WOT or a bit from idle (the neutral switch will be activated if you use the remote control).
Run the starter and check if you got fuel mist at the rag, if not you have a fuel issue in the carbs.

If you got fuel mist at the rag there is a igniton issue.
You stated there are spark at all three plug but will not fire at the #1 and #3 plug when in.

Then you have to check the DVA output from CDI box to the coils.
Should be 300VDC or more. Outboardignitiondotcom have troubleshoot chart or check your factory service manual for spec.

Maybe the coil can spark at atmosfer but not under compression.
Also check with a spark tester how far the coil can jump a spark, must be able to jump at least 1/4-5/16 in or more.

thank you Nordin,

I will print your advice & bring it with me, so I can follow it to the letter.
(in combination of trouble shooting chart & manual)

I've been getting distracted with diagnosing (backed in a public boar-launch)

 

[The Force power]

Wow, fire on all 3 but stalling when #2 plug's pulled???
Yet it runs good at idle??

What are the air screws set at on all 3 carbs?
Factory said 1 turn out and leave alone.
But sometimes they need to be out farther. ?

Test the strength of the spark, this tester or one like it is needed.
What plugs? NGK Champion? Gapless or gapped?
Spark should jump 1/2 -9/16 on the tester.
Make sure the coils connections are tight, a bad ground can cause problems.
What's the static timing set at?

Find FrankA's post called a Link and Sync.
If the carb linkage is off it can make it stall.

Any fuel coming out the carbs when running?
Take the plenum off and run it.
Nordins paper test, do it on the front of the carb too.
It should suck the paper against the carb.
If it pushes it away? the reeds are bad.

Clean the carbs.
Add a filter between the pump and carb.
Fram G2 G3 G12 all are plastic see through.
One tiny TINY piece of dirt can cause problems.
(1993 125 had a miss, cleaned the carb 3 times, saw nothing, still missed,4th time
It cleared up and ran great????)


Test for air leaks, can of starting fluid, start motor and spray around the intake side of the
powerhead, around the port covers and carb bases.
If this makes any difference? a gasket gone bad.

Hi Jerryjerry,

the plugs are gapless NGK new BWXZ (or something like that)

I'm bringing the timing-light up to verify my setting(have been adjusting out of desperation)
I will print off your advice as well

thank you Jerry & I will post the results

Carb-screws just over one turn out & fuel-filter (after pump) full of fuel