Question about 2003 Yamaha YZ 250

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How can i check a stator coil if i suspect its defective ,this is used on a yahaha boat engine

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These stators YZ 2003 you can replace for about $150 (ebay) truth is unless you have the meter to test i you cant test only guess from the symptom such as most common is engine dies once warm
then to take somewhere to be tested they no doubt will charge when ever I suspect it I just replace it and eliminate the possible problem especially on a older bike 05 or older.

Posted on May 20, 2011


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I HAVE A 90 hp FORCE OUTBOARD ENGINE. Has been running fine. Last week on lake, it wouldn't start. I just checked for spark at plugs. None Any Ideas

I would check the ignition coil. They dont give any warning when they go bad. If it was a stator you would have a weak spark and hard to start issues.

May 22, 2017 | HP Boating

1 Answer

I have a 1997 yamaha 130 hp boat motor ichecked carbs firinf every thing checks out it will crank and run but when you excelerate it bogs down what could it be the stator ,power pack or what

Isolate the fuel tank in the boat by running the engine on a separate fuel source like a portable tank. That is the first step. Get a portable outboard tank and run the engine on that. 99% OF THE TIME ITS THE BOAT NOT ENGINE

Mar 27, 2016 | Boating

1 Answer

Susuki outboardmotor 115hp 1998 has weak spark in four coils

Hello Ernest,
How Are You Getting Your Opinion Of Weak Spark?
Have You Fitted a New Set Of Plugs?
If All Four Coils Are In Fact Weak Then It Could Be The Stator,
You Need A Tester To Check The Voltage From The Stator To Determine Its Condition.

Apr 08, 2014 | Boating

1 Answer

80hp yamaha idles good.but when I cuts off when put in gear

Sounds like it is running on two cyl,could be many things,check for spark,change plugs,check compression,clean carbs,check fuel pump diaphragm,check stator,coils,cdi,trigger coil good luck

Nov 20, 2013 | Boating

1 Answer

2000 honda crv engine

coil, stator, or wire to ground and to kill switch, it is grounding out somewhere - remove from coil to test.that.
Get inline spark tester at princess auto cheapie 6.00 can, or 10 for a good one. spark plug, timing, head gasket burn valve, hard to tell without compression test. if low put cap of oil in cylinder and if goes up is rings, if stays low (under 50lbs should be 90.) if stays low is a valve or head-gasket.
Check plug if dry when trying to start vehicle with choke on then remove spark plug and inspect it.
is carb or fuel problem if dry, is electrical if wet!
check fuses, and stuff and wires but probably a CDI unit to control the spark, or if old is a set of points and condensor and the spark must be triggered by a CDI, a lobe, or a coil CDI unit combo.
The coils on stator send 12 volt, coil to sparkplug send 20,000 volt and the gap in points or ruluctors should be set properly, typically stator to reluctor is set by a book of matches not folded but put piece carboard in between,spark plug gap say double that..
I suspect without more input fuel or spark. if the engine wont turn over the fuel to oil mixture wasnt enough, or the oil injector for fuel mixture if two stroke maybe clogged and may destroy your engine.
I don't suspect this but giving things to consider later.
Some bikes there is wires in a rubber plug as a chaijn indicator and the chain can break this connection, not sure about 4x4 though.

Nov 01, 2013 | Computers & Internet

2 Answers

I have a 94' Mariner Tracker pro series 60hp, it

It seems like the ignition key is suspect and needs to be replaced. The ignition could be preventing voltgae to the stator and ignition coils. See if you have battery voltage from the terminals on the ignition switch by using a voltmeter. If there is voltage from the ignition switch, yoy may have a bad stator that is causing a no spark condition.

Aug 07, 2011 | Boating

1 Answer

MTD yard Machine lawnmower,17hp Briggs And Stratton engine. Runs for about 15 or 20 minutes and stalls. It will not start again until I recharge the battery over night. Then only runs again for 15 or 20...

yes it could be

check your battery 1st , then check the stator a/c output

• 10 or 16 Amps DC regulated for charging
• Two black leads (C) from stator
• Yellow connector (D) with two pin
• Two yellow leads (E) to regulator-rectifier
• One red lead (B) from regulator-rectifier
to red connector output lead (A)
• 10 and 16 Amp systems use the same
stator, color coding and regulator-rectifier
• Alternator output is determined by the
flywheel alternator magnet size

The stator and regulator-rectifier are the same
for the 10 and 16 Amp systems. The system
output is determined by the flywheel magnet
Test Alternator Output
1. Temporarily disconnect stator wire
harness from the regulator-rectifier.
2. Insert RED test lead (A, Figure 28) into the
V ω receptacle in the meter.
3. Insert BLACK test lead (B) into COM
4. Rotate selector to AC Volts position.
5. Insert RED (A) and BLACK (B) test lead
probes into output terminals (D & E) in
YELLOW connector (C). (Test clip leads
may be attached to either terminal).
6. With the engine running at 3600 rpm, the
output should be no less than:
• 20 volts - 10 Amp System
• 30 volts - 16 Amp System
7. If No or Low output is found, check for
bare wires or other defects. If wiring
defects are not found, replace the stator.
voltage depending on alternator type and magnet size

then check the regulator / rectifier , make sure it is grounded properly

make sure battery earth lead is good

i suspect loss of bat voltage is letting the afterfire solenoid close off the main jet

let me know model and type codes off engine & i will try help further


Aug 29, 2010 | Briggs & Stratton Garden

1 Answer

1993 40 HP 4 cyl. Mercury outboard: Running along

I solved it with no help from the professional assistant team. Thanks for no help till I send money...DON'T THINK SO!!! Thanks for wasting my time.

Sep 03, 2009 | Boating

1 Answer

Boat 100hp

Remove one of the plugs, plug it back into the lead and holding the rubber lead, allow the spark plug end to touch the metal on the engine. Turn over the negine and check for spark. Repeat for the other plug.

No spark = faulty CDI unit, faulty coil, faulty stator

Jul 11, 2009 | Boating

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