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model#90ETLJ

i have a 90hp yam...
i have a 90hp yam with no spark to #1coil i witched the coils the coil works cly2 why? the motor is runs on two cly?
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Answered in 3 minutes by:
6/26/2010
Jason Forsberg
Jason Forsberg, Marine Mechanic
Category: Boat
Satisfied Customers: 531
Experience: 5 years experiece yamaha mechanic with knowledgeof all outboards
Verified
Hi. What's the model number? Are you saying that you had no spark on #1 coil but then changed that coil to another cylinder and it then sparked? Did you try the other coil on #1 to see if it sparked?
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Customer reply replied 8 years ago
model# XXXXX i switched the coil thinking it was a coil problem but wasnt it sill no firing on #1cyl
Ok. If the problem didn't move the coil then the next step is to do a power pack output check and pulser coil, charge coil output test. Do you have a peak reading voltmeter( a regular voltmeter won't read the quick ignition pulses).
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Customer reply replied 8 years ago
what setting do i put the meter and were to put the leads
Are you using a digital meter with the adapter or an analog needle meter?
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Customer reply replied 8 years ago
digital meter
Are you using a peak reading adapter with the meter or just the meter itself?
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Customer reply replied 8 years ago
meter itself
The meter itself will not read the quick pulses of the ignition system. You need to get either a peak reading adapter or an analog DVA meter to do the proper testing.
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Customer reply replied 8 years ago
Relist: Incomplete answer.
Jeff G.
Jeff G., Marine Mechanic
Category: Boat
Satisfied Customers: 4,730
Experience: 42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
Verified
Welcome,
I will be happy to assist you. If you have a question or need clarification please post back at any time.
Can you confirm the year?
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Customer reply replied 8 years ago
86
You can't read voltages at cranking without the DVA adapter for your meter, I can give you resistance readings.

Trigger
white/red to white/yellow 290-370 ohms
white/green to white/black 290-370 ohms

Stator
low speed
brown to blue 765-935 ohms

high speed
red to blue 105-135 ohms

Check the flywheel for a sheared key.

Do these tests and post back your results.
Jeff G.
Jeff G., Marine Mechanic
Category: Boat
Satisfied Customers: 4,730
Experience: 42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
Verified
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