Oh man do i need help

12 replies to this topic
  • xr500_89

Posted June 21, 2006 - 07:42 PM


ok i bought a dirt cheap xr600 a while back and have been working on it ever since sparing no money on the best of parts i get everything togethor and try to start is and no spark, i replaced the pulse generator and check the ignition coil so all is good i get voltage going to the spark plug boot and i cant figure out why she wont spark or start i have this potentially insane bike and sje wont start i cheked alll thegrounds aswell and all seems good just still no spark please give me some help and ideas.

  • captb

Posted June 21, 2006 - 09:03 PM


Might try removing the tank and kick it over in a dark garage and see if the coil or plug wire is arcing.

  • Xr650rhonda

Posted June 22, 2006 - 02:15 AM


I would buy a new spark plug and cap, the ignition cap twists off the coil lead and do fail, plus they are cheap to replace.

  • XR6's_rule

Posted June 22, 2006 - 04:52 AM


First I would check the obvious things like- is all the wiring all connected properly, and if the plug cap is screwed on the coil lead properly. A common problem with the early XR6's is with the exciter coil on the stator going bad. Check the resistance of the black/red wire coming from the stator to ground. You should get between 200-350 ohms otherwise the stator is bad and will need replacing/rewinding.

  • xr500_89

Posted June 23, 2006 - 02:54 PM


everything you guys have stated i have done 10 times over and its driving me crazy i need this bike to be ready by july 4th, brand new blug boot get continuity the hole shibang yet still no spark, stator is good measured at about 300

  • XR6's_rule

Posted June 23, 2006 - 10:50 PM


If you're sure the stator/pickup are ok, next I would check to see wether you have voltage getting to the coil. If you have a multimeter set it to Ac Volts, when the bike is kicked over vigorously (remove the sparkplug) you should read between 15-25 volts max at the black/yellow wire. If you dont get that voltage to the coil, you have a CDI box faulty or wiring problem. Check all the wiring for continuity between all points.

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  • xr500_89

Posted June 29, 2006 - 04:36 PM


well unfortunatly thats about what i get to the spark plug boot yet still no spark its very very irritating like i said i get plenty of current to it cause i shocked the crap out of my hand. im at the point where i going to redo all the wiring cause time is winding down

  • Thumpmeister

Posted June 29, 2006 - 05:24 PM


This might seem kind of mundane, but did you check to make sure your plug is properly grounded to the head? If theres no ground, there will be no spark.

  • swass

Posted July 06, 2006 - 03:05 PM


i have a 93 XR650L.it runs great.but every so often it wont start[spark].giggle the wires and maybe it will start like nothing was wrong.i hate its wishy washy attitude.what do i say[do]to her?i want to go on a long ride.

  • creeky

Posted July 06, 2006 - 05:56 PM


How about the ignition pulse generator rotor? Did you have it off? I know it seems impossible to get it on in the wrong position, but I actually did it once and had spark, but at the wrong time. Did you recheck for proper cam timing?

  • Shawn_Mc

Posted July 06, 2006 - 07:46 PM


I almost hate to ask, but did you try more than one spark plug?

After I got my XR running on the old plug, I put a new one in it. Then chased a percieved carb problem for weeks and weeks. Then at one point I checked the plug and found it to be intermittent. Ive worked on a lot of stuff, but Ive never seen an intermittent spark plug. Sometimes it would work, and sometimes not. I changed it again and the thing runs like a champ...

  • wr450fyamaha

Posted July 08, 2006 - 06:21 PM


Shawn, what the hell mean, 6900 posts? is that legal?

  • Nummie

Posted July 08, 2006 - 08:07 PM


My brother-in-law's bike started working like crap during our last ride. It would idle fine but wouldn't take any revs - backfiring and hardley running. It turned out to be partially stripped spark plug threads in the head. The plug wouldn't ground properly. You have a new plug and wire right ?

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