Question about 1986 Honda XR 250 R

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I have a 1986 yz 250 that is getting no spark. I put on 3 coils and still no spark. Any ideas where to go next?

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Replace contact points... make sure to install it properly..

Posted on Oct 02, 2010


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2005 yz250 2 stroke has no spark! changed out spark plug, stater, coil, plug cap, cdi, checked wire harness for continuity? cleaned ground block and still no spark? what did i miss?

Hi, Rob1 and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, needs to be 12.5 volts or better and be able to pass a "LOAD" test, your battery may show 12.5 volts but has little or zero amps and must be replaced.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting, leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or CDI or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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May 01, 2017 | 2005 Yamaha yZ 250 F

1 Answer

I have a yz 250 Yamaha layed it over on it side and now can't get it to start put new spark plug in has spark but won't fire

fuel problem take out the carb and clean all the jets and the bowl also put a high flow fuel filter in as a precaution incase there is debree in the tank your problem is that you are not getting enough fuel or any at all.

May 11, 2012 | 2003 Yamaha YZ 250

2 Answers

My yz 250 will start with a roll start,but I can't

Not sure of the age of your YZ 250 ( You never said!) but in most Yamaha they use dual stage stator which means a stator will charge a spark plug at two speeds one on kick starter speed and the other on running speeds it is common that the low speed circuit on the stator to fail leaving you with a bike that only starts when pushed its a very simple test to diagnose it be worth checking you have spark on kick starter speeds with spark plug out the motor but still connected

Dec 04, 2011 | 2003 Yamaha YZ 250

1 Answer

1986 Yamaha yz 250 won't rev to powerband

Hi, Patrick and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Oct 13, 2011 | 2003 Yamaha YZ 250

1 Answer

1986 honda 250 fourtrax wont fire no spark

sounds like your coil is bad,could be few other things but coil is most common,and least expensive.if memory serves me right its mounted under tank( just follow plug wire to coil) will cost around $40.00 used and $80.00 new

May 31, 2010 | 1986 Honda XR 250 R

2 Answers

The yz 250 1986 has the same engine as the tri z

no it is not the same.

Tranny is closer for yz
YZ has no lightning coil
intake system is far different from both.

BUT fitting is the same, so switching from one frame to another may be doable.

Dec 23, 2009 | 2003 Yamaha YZ 250

1 Answer

I got a 01 yz 250 it gets spark every once in a

if the coils and CDIs have been replaced, you may want to check your wiring, this is usually caused by a damaged like grounding the frame and affecting the spark.

Dec 23, 2009 | Yamaha YZ 250 Motorcycles

1 Answer

No spark on 1986 yamaha 250 yz got new plug still no spark

ok now first check if you have power to the coil with a volt metre

Oct 11, 2009 | Yamaha YZ 250 Motorcycles

1 Answer

Headlight 1972 yamaha 250 yz

You can add a headlight if the type of ignition system on your particular model is the type that will let you. Several different systems were used back then. The proper system will need a lighting coil installed onto the plate underneath the flywheel. The flywheel must be pulled off. You will see a coil there already for the spark. An unused set of threaded screw holes is present, (the same plate was used on the bikes that had a headlight). Just add the coil and now you have power for a headlight.

May 05, 2009 | 2004 Yamaha YZ 250 F

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