sandman Posted September 1, 2019 Report Share Posted September 1, 2019 I recently got back from a trip to the dunes & while I was there I experienced something I’ve never seen before. My spark plugs electrodes started turning yellow. I’ve read that this can be caused by old race gas & that the yellowing is caused by lead deposits. This effects the spark & in my case caused the bike to run rough on the top end (misfires). Has anyone else experienced this before? The fuel I had bought a month before trip from a distributor close to me which is where I always buy it but have never seen this before. I don’t know how old the fuel was before I bought it however. My jetting is spot on & has been the same for about 14 years. I run 50/50 race gas/ 92 octane with a dune port, +4 timing & 28mm pwk’s. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted September 1, 2019 Report Share Posted September 1, 2019 It might not be the fuel at all. Did it rev up fine and run OK on the bottom?If so, I’d lean towards a bad CDI. I’ve had two of them over the years cause an issue just like that. Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted September 1, 2019 Report Share Posted September 1, 2019 I’m with Ty Ty. If everything else is standard protocol, I’d look into the ignition arena. Quote Link to comment Share on other sites More sharing options...
sandman Posted September 2, 2019 Author Report Share Posted September 2, 2019 9 hours ago, locogato11283 said: It might not be the fuel at all. Did it rev up fine and run OK on the bottom? If so, I’d lean towards a bad CDI. I’ve had two of them over the years cause an issue just like that. I suppose it’s possible alright but would a Cdi cause the the plugs to turn yellow? I should mention also that when I dropped 2 brand new plugs in, the studder on the top end went away until the plugs turned yellow 30 to 45 minutes into the ride at which point it returned. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted September 2, 2019 Report Share Posted September 2, 2019 CDI can work intermittently. Everything that’s being described is a symptom of a bad CDI. Coloring could be from the CDI not working I suppose. But that working fine and then not 30-45 minutes later almost has to be electrical. Plus, that’s the kind of shit a bad CDI will cause. Coils almost always work or don’t work. CDI can work fine one minute and be fucked the next. Quote Link to comment Share on other sites More sharing options...
sandman Posted September 7, 2019 Author Report Share Posted September 7, 2019 Well after doing some part swapping & testing In the dirt it looks like you guys were mostly right . It wasn’t the fuel at all & was electrical. It wasn’t the CDI however it was the stator. I’d recently put this aftermarket stator on which I never wanted to do but couldn’t get my hands on a oem one while out on a trip so had to settle. Still don’t know how a stator causes yellow spark plugs but after switching back to an oem one they’re not turning yellow & bike runs like it should...smooth! Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted September 8, 2019 Report Share Posted September 8, 2019 You failed to mention the new stator part in your original post! OEM only on everything ignition! Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted September 8, 2019 Report Share Posted September 8, 2019 So I was basically right. Quote Link to comment Share on other sites More sharing options...
sandman Posted September 8, 2019 Author Report Share Posted September 8, 2019 I did not mention the stator as I just didn’t see how it could cause yellow plugs & the bike would actually run great with it until the new plugs turned yellow. Live & learn I guess. After owning one of these for 24 years I still run into shit I’ve never seen or heard of before. Good thing I’ve got you guys around here to keep me straight! Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted September 8, 2019 Report Share Posted September 8, 2019 Junk. All of them. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 9, 2019 Report Share Posted November 9, 2019 Ricky Stator fucks another one. Quote Link to comment Share on other sites More sharing options...
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