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Can't get spark to the plug on my 1971 Yamaha 250 dirtbike, what can I do?

Can't get spark to the plug on my 1971 Yamaha 250 dirtbike

Posted by Anonymous on

  • 7 more comments 
  • ROD GANDY Apr 22, 2015

    check the condenser, it is with the points, it round with wire with connector, than you have to have a filler guage to set up the points.

  • ROD GANDY Apr 22, 2015

    does the battery have enough cranking amps to turn over bike,

  • ROD GANDY Apr 22, 2015

    check the key or ignition, or when the key is turned it send signal to the coil, starter, points, condenser.

  • ROD GANDY Apr 22, 2015

    did you check the start or is a kick start bike, than disregard

  • ROD GANDY Apr 22, 2015

    check the gound for the bike, make sure it is tight, clean and no corrosion.

  • ROD GANDY Apr 22, 2015

    check the positive leads or battery cable, check for corrosion, fraided wires, loose connector,

  • ROD GANDY Apr 22, 2015

    check the battery post for tightness, or secured inside the battery. check to make the the water level are at the proper requirement, and it is fully charged

  • ROD GANDY Apr 22, 2015

    check the wiring to the lights, check for corrosion, fraid lines, loose connection, grounded properly, and there no short thats grounding out the bike.

  • ROD GANDY Apr 22, 2015

    if the points are not set to the proper gap the bike will not start or stay running.i will try and find out that info for you.



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That bike is simple and not much can be wrong, check the coil, the wire where the plug goes, check the points, service manual

Posted on Apr 21, 2015

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  • Yamaha Master
  • 661 Answers

The most likely thing to cause that is a faulty primary ignition coil it's very very common on older model motocross and trail bikes.

Posted on May 02, 2015


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Hi there,
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Posted on Jan 02, 2017

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SOURCE: 1994 yamaha fzr 600 spark plugs foul after about

Really...strange what you need to do is see if the bike is running too fat. So...warm her up witha fresh set of NGK! spark plugs. After the bike is warm take it down the street and back. When your on the way back get on the throttle and accelerate then shut er down and coast it into the garage. This will give an acuurate read on the spark plugs at operating temperature and under a load. Pull all the plugs. If they are brown like coffee with cream that means carbs are adjusted correctly. If they are black and wet too rich and if they are white or very light brown too lean. Other problems may be oil soaked plugs from loose top end parts. Maybe valves or guides.

Posted on Mar 05, 2009

  • 3567 Answers

SOURCE: what is the spark plug gap for a 1972 yamaha dt


Posted on Aug 16, 2009

  • 37 Answers

SOURCE: 1971 yamaha 175 motorcycle electrical problem

ill do a list of things that can help or be the problem.

1) Pull the coil off and wire brush down all the bare metal. then do the same to the frame where it bolted on. Make sure there is a grounded wire that bolts back onto the coil if there was one, Replace the wire end for the ground peice.

2) Pull off the spark end cap and cut the wire down a few mm until you see new wire then screw it back on. (if its NGK)

3) follow the wire from the kill switch and make sure it isnt grounding out.

4) Hotwire - find the kill switch and unplug it. if this doesnt help unplug the ignition key wiring. on older bikes it will work for ignition but not lights for the key part. if this helps you need a new Ignition barrel / Kill switch.

5) check your wiring harness make sure it isnt grounding anywhere exept where its ment to.

6) make your your engine to CDI is plugged in and has no oxide in it

7) try and find somone with a running bike the same as yours and borrow there CDI, if this helps you need to buy a new CDI or check yours for wiring shorts.

hope this helps if not buzz me (

Posted on Feb 17, 2010

  • 267 Answers

SOURCE: need picture or diagram of the 3 coils and

The above site has full diagrams for the whole bike (1971 DT1E), diagr. below from site shows elec. components, hope it assists you.e87097a.png

Posted on Apr 27, 2010

  • 1 Answer

SOURCE: 1995 Yamaha YZ 250 What fuel/oil mix ratio

spark plug brand i am using is an NGK IRIDIUM IX (BR8EIX) number 3669 fires up first time everytime i have a yz 250 1995 model aswell

Posted on Oct 19, 2012

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1 Answer

1971 DT 250 No spark

Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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 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
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I have a 1988 YZ 250 dirtbike and it is really hard to start, and fouls spark plugs all the time.

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