KX Riders

Maintenance & Technical => KX500 Original => Topic started by: skippyhenry on May 06, 2010, 01:08:55 AM

Title: Timing way out
Post by: skippyhenry on May 06, 2010, 01:08:55 AM

need help with my timing,its been a bugger to start since i had the motor rebuilt. Ive had the electrics replaced, new magneto, stator rewound, its getting spark,back fires a lot and then starts but wont idle. Reeds are good, carburator is new, so what I did is ran a timing light to check timing it should be at about 7 deg but is firing at 90 deg, half way up the bloody barrell is that premature or what  :? oh its a k500 1989 what can i do to get it back to 7 deg thanks

Title: Re: Timing way out
Post by: bob larry on May 06, 2010, 03:45:32 AM

Get the manual out and go through the timing proceedure.... :mrgreen:

Title: Re: Timing way out
Post by: maddoggy on May 06, 2010, 03:53:57 AM

are you sure that the key was installed when the flywheel was put on the shaft? with timing that far off, i cant think of anything else it could be. pull the flywheel and verify that the key is in place and that it is not sheared from an initial backfire.

Title: Re: Timing way out
Post by: Friar-Tuck on May 06, 2010, 05:38:13 AM

 I'm sorry I don't know how to put everything in order  :|
  You should find what you need here:
http://www.kxriders.com/coppermine/thumbnails.php?album=259&page=2
   Tuck\o/

Title: Re: Timing way out
Post by: allan1353 on May 06, 2010, 10:39:50 AM

To me it sounds like a sheared key as maddoggy pointed out.

Title: Re: Timing way out
Post by: skippyhenry on May 06, 2010, 11:11:27 PM

thanks for the replys, the key is good but the magneto is the wrong one for that year motor.So am going to get a new key way cut into the magneto. Fingers x :-D

Title: Re: Timing way out
Post by: Polar-Bus on May 07, 2010, 12:40:30 AM

Quote from: skippyhenry on May 06, 2010, 11:11:27 PM

thanks for the replys, the key is good but the magneto is the wrong one for that year motor.So am going to get a new key way cut into the magneto. Fingers x :-D

This sounds like a recipie for detonation disaster too me....

Title: Re: Timing way out
Post by: maddoggy on May 07, 2010, 03:30:38 AM

i agree with polarbus. i would not take a chance on cutting a new keyway. sounds like a disaster waiting to happen. if you cant afford a new one now, you would be better off to save up for a while and buy the proper mag. seriosly, i wouldn't try the repair. think about what pre-det. does. it fires the fuel/air charge while the piston is still on the way up tries to force it back down. bad, bad, bad things can happen to your motor. motor repairs could cost more than the proper part. not being a jerk here, just trying to help.
                                                                              maddoggy

Title: Re: Timing way out
Post by: kaw rider on May 07, 2010, 05:40:43 AM

you would be money ahead to upgrade to a 90 and newer ignition

Title: Re: Timing way out
Post by: Motorrad on May 07, 2010, 06:37:43 AM

Have you checked it with a degree wheel, and dial indicator down the plug hole?   I wouldn't trust a timing light in this application....

Title: Re: Timing way out
Post by: skippyhenry on May 07, 2010, 12:10:04 PM

All right guys you've scared the pants off me, I will get the right magneto. Thanks for the replies. And have a good weekend.