Question about 2000 Yamaha YZF-R1

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Weak spark I have weak spark on coil that sparks 1 and 4 how ever i have tested borth coils they are fine Spark plugs are fine tested the volts behind coils on the elctrical wire and they are the same however the spark is still very wekak on 1 and 4 what could the problem be

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If you have an ohm meter, check the resistance on coil 1 and 4 - across the positive and negative wires and compare that to the coil that feeds 2 and 3. If the resistance is higher on coil 1 and 4 that would cause a week spark and i would suggest changing it. If you don't have a meter, simply connect coil 2 and 3 to the wiring of coil 1 and 4 and turn the bike over and check the spark. if it is a stronger, then your 1 and 4 coil is the problem and will need replacing. Prior to checking all this, make sure that the earth contacts on your coil to bike frame are good and are clean and free of corrosion and the like. Hope this helps

Posted on Apr 14, 2014

  • Einstein
    Einstein Apr 14, 2014

    Thanks for the help

  • Einstein
    Einstein Apr 14, 2014

    I have done the check with coil that sparks 2 and 3 to the place of 1 and 4 the it gives me a weak spark aswell I am not sure how to check the earth on the coils as the coil that works has a red wire and a grey wire and the coil with the weak spark has orange wire and red wire bothe coils are mounthed on a plastic frame it does not come close to a earth

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Posted on Jan 02, 2017

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  • 3567 Answers

SOURCE: yamaha125dtr

Get a BRAND NEW plug and recheck for spark. Be sure plug is grounded to engine. By the way, FTjoe (above) has some very good questions. The sator is not involved here. The dealer can check the CDI usually for free.

Posted on Mar 14, 2009

ollie reece
  • 1167 Answers

SOURCE: I have a 2001 yz80. The spark seems weak. I tested

yes buddy the only way to test the cdi is too put on another bike and if it was the stator it wouldnt spark and yes you are on the right tracks but maybe it could be the plug does it run brilliantly

Posted on Nov 06, 2009

Testimonial: "Thanks Ollie, the information was fast and helpfull. Thank you , Silvio"

ckoira57
  • 267 Answers

SOURCE: need picture or diagram of the 3 coils and

http://www.boats.net/parts/search/Yamaha/Motorcycle/1971/DT1E/parts.html

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: my dt125 has no spark the coil and plug re new and

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Posted on Jul 31, 2010

astrawoid
  • 294 Answers

SOURCE: weak spark--put on a new

May be CDI, but check all your grounds first. Make sure you have a clean metal to metal connection of the coil to frame. Disconnect the leads going to the kill switch also. you may have a high resistance to ground short. Also, did you replace the lead coming out of the coil going into the spark plug? did you reuse the old lead?

Posted on Dec 07, 2010

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