KX Riders

Maintenance & Technical => KX250 / KX125 => Topic started by: rmpmrace on November 05, 2019, 02:05:39 AM

Title: 1979 kx125
Post by: rmpmrace on November 05, 2019, 02:05:39 AM

Been trying to set the timing on my 1979 Kx125 a5, cant get the marks to line up. Its like there's not enough travel in the stator plate. so i cant move it far enough to line things up.. I've verified that the TDC mark is correct.And with the head off I used my dial indicator to set it static. With the engine running , the timing light shows that its not advanced enough and as i said you can't move the plate far enough to get things to line up. Any ideas, help or thoughts would be appreciated. Thanks Rick

Title: Re: 1979 kx125
Post by: rmpmrace on November 07, 2019, 01:52:40 AM

must not be to many vintage mx guys over here. just looking for a little info and or input. Thanks

Title: Re: 1979 kx125
Post by: KXDINO on November 07, 2019, 07:41:10 PM

You need to get the service manual for the specs.

Title: Re: 1979 kx125
Post by: motorman455 on November 08, 2019, 06:34:20 AM

Are the stator wires behind the plate or through the case hung up or not long enough possibly? This happened to me on the KX500 and limited how far I could rotate the stator until I freed them.

Title: Re: 1979 kx125
Post by: rmpmrace on November 12, 2019, 05:24:45 AM

yes I used the specs in the manual, and it said to set the marks with the piston a certain distance btdc and line the marks up but the slots in the stator plate would not allow it to go far enough. when i get home tonite i will take a couple pictures.

Title: Re: 1979 kx125
Post by: oldmxer95 on December 13, 2019, 10:17:08 AM

I had an A5 when they were new. By far my most favorite 125.

Title: Re: 1979 kx125
Post by: KXDINO on December 13, 2019, 02:21:32 PM

Brother had one , rode it once , the magazines picked on it for hard shifting under full power , i was to young to ride it like that so i ask you on your experience on the shifting side of things . cant believe what they say half the time.

Title: Re: 1979 kx125
Post by: oldmxer95 on December 16, 2019, 01:59:37 AM

I don't recall it being hard to shift under power, but then again that was 40 years ago.  :-)

Title: Re: 1979 kx125
Post by: rmpmrace on April 01, 2020, 01:54:23 AM

mine shifts fine, just grip it and rip it.
finally solved my ignition problem, it seems to have been a 2 fold issue. bad cdi box, so i was trying to compensate for that with the timing. then installed another box but didn't go back and reset the timing so it was still not running right. that's when i went back to square one, pulled the head AGAIN , put the dial indicator back on and found that the timing was all jacked up. Reset that and its now running good. I have some fine tuning to do but I think I'm on the home stretch now. Now if they would lift this d**n quarantine so we can go racing !!!!