Question about 1973 Yamaha RD 250

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I have a 31k wiring loom,31k cdi and switch gear but have a 350r lc ypvs stater and flywheel how do i get it to spark.is it something to do with side stand switch please help a.s.a.p .thanks

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You can cut the wires at side stand and wind them togeather and then check for spark

Posted on Oct 27, 2011

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The side stand switch will not stop this from sparking.
Why are you using a powervalve genny and flywheel with an older DX set up, for starters the pick up's are not gonna work as the DX is battery points ignition unless it's an E model but still the pulse generator which signals the capacitor in the cdi to fire is still in a different position, not quite sure why you are doing this but would be interested to know why and what the remedy was.
Hope this helps

Posted on Apr 25, 2010

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Kdx 125 wont spark


THIS QUESTION DONT MAKE SENSE SINCE THREES ONLY ONE SPARK PLUG ON A KDX 125..BUT A WEAK SPARK COULD MEAN ANYTHING IN THE ELECTRICAL SYSTEM..CDI,STATER,WIRING LOOM,CORRODED CONNECTION SOMEWHERE...ITS HARD TO SAY WITHOUT SEEING IT..AND SYSTEMATICALLY TESTING ITS COMPONENTS..

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I got no spark ive replaced everything electrical i.e cdi , stator ,regulator, coil , plug even the loom still no spark ? any advice


Do you have voltage to the wire that goes from the ECM to the ignition coil?If not, check the kill switch and the side stand switch for malfunctioon.

Feb 09, 2012 | Motorcycles

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Hi. no spark on my yamaha dt 125 lc ypvs from 87. New cdi box. but same problem


sounds like the stator coil in behind the flywheel there are some electric tests for the stator but not allways correct I would try a stator

Mar 21, 2011 | 2000 Yamaha DT 125 R

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Hi i have a 1997 yamaha 350 warrior i have no spark to the spark plug what could be


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No spark ,new coil ,new stater, cdi, still no spark


If the bike uses a 'kill switch', check that it is not broken or shorted out to the bars. If it has an ignition switch, the switch may be defective. Look for damaged wiring around any of these parts.

Dec 16, 2009 | Suzuki RM 125 Motorcycles

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Cant get a spark from ht leads on cb250 motor bike


Be CERTAIN the battery is good. Are all fuses good? Try brand new spark plugs. Disconnect the kill switch on the handle bar. Check the side stand kill switch for proper operation. Have the shop check the CDI ignition.

Please rate this solution. Thanks!

Apr 01, 2009 | Honda CB 250 Motorcycles

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19-95 KLF300 ATV Kawasaki 4x4 no spark put new ignitor unit on.


You said the motor cut out and popped and backfired when it quit, this is almost always one of two things; either the low speed pulse coil or the actual CDI "black" box. You will almost never lose a main coil. One thing I would also check to make sure did not happen is shearing a flywheel mag key. When the motor backfires you can easily shear a mag key if you have a heavy flywheel, (external). However when this happens you don't usually lose spark but it will certainly cause the backfire.
One other item of importance is that the bike you are in question about does not emit a bright spark when you are checking for fire. Make sure you are using a brand new plug and ground it on the head. Try to make sure you are in a dark environment when you check the spark.

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