Dirt Rider . Net Text Version Home
Pages: 1
She's Loading Up Captain, she can't take anymore..
(Click here to view the original thread with full colors/images)
Posted by: Bruce---------------------
Jeez... going through sparkplugs lately from loading up.
The bike: modified KDX 250, always was a tad sensitive to loading up but this is getting ridiculous. It's coughing and belching and loading up about 6 times an hour.
Here's what's changed since started this problem:
Riding with my son, the beginner, in first and second gear all the time. A lot of chugging
Riding with another new rider, but not as slow as my son.
Added a moose fender bag to the back fender right up against the seat, affecting airflow somehow???
Running an NGK 8 (can't remember details off hand, but using both racing and non-racing plugs), Always have run these plugs, never had much of a problem in the past. For the last four years, I've run YamalubeR at 40 to 1. Previous owner also ran at 40 to 1.
Should I simply start sticking in hotter plugs? Check packing in the silencer?
Thanks for any guidance.
Posted by: Moose95---------------------
Checked your air filter lately? Also if you've recently cleaned it and oiled it too much it can lead to your bike running rich. I'm not sure about the KDX-250, but my KDX200 uses NGK's BR8ES, if you want to go hotter, just go for a lower numbered plug. Good luck.
Posted by: Robcolo---------------------
When on a "just Putting around" ride go to a hotter plug --and the "details" are very important. B7EV or B7EG. These have a very thin electrode that will fire even when covered with oil. The S series plugs have a much wider electrode prone to fouling but much cheaper to manufacture. The R series have an internal resistance and thus an internal voltage drop. They are primarily used for eliminating radio frequency interference --not m uch of a concern for most mototcycles. [A few electronic ignition systems specify the R plugs to eliminate RF feedback]. You might also consider dropping the needle 1 clip.
Posted by: jmutiger---------------------
I have a 1993 KDX250, and it's been eating plugs lately too..
I was getting pissed off with it, so I dropped my needed on the trail, it's now all the way down (top clip).. And I haven't ruined a plug since.. Leading me to believe it's simply a jetting issue.
Last season, on the same bike, I didn't foul 1 plug.. But over the winter I ported the bike, and also put in a KX head gasket.. Perhaps the combo made the jetting even richer than it was (relatively).. Anyways, when I have a chance, I'm going to rejet it, and hopefully find the solution to my now very expensive problem.. I've gone through probably 15 plugs in the last 10 rides.
Jon!
Posted by: spanky250---------------------
Sounds like the begginings of a wet-side crank seal leak to me...I went through the same problem a couple of years ago. The jetting that had been perfect for a long time, all of a sudden didn't seem so perfect anymore. I started eating plugs for lunch. The problem turned out to be the crank seal, even though I wasn't noticeing any excesive smoke, or loss of tranny lube.
Man, I hate changing Kawie crank seals...why did they have to put the darn things on the inside, forcing you to split the cases? 
Posted by: canyncarvr---------------------
re: B7EV or B7EG
I don't think they (NGK) make the 'G' series in a 7 heat range. So I've been told by three different retailers anyway...and I didn't see it listed in an NGK write-up neither. Hence...I'm currently running a B8EG.
From another thread, mr. rohrich brought up a projected reach series..say a BPRxxx. That type of plug would tend to run cleaner.
Jmutiger: If it's just been ported..worked well before, has 'issues' now, I'd for sure be working on jetting before I worried about crank seals.
re: splitting cases. Never done that. I have this vision of little thingys going 'sproing' all over the place. I saw a shop mech putting together (timing) a crank with a SLEDGE once...thought, 'I don't wanna do that!'
Text Version Home
vBulletin Copyright ©2000 - 2009,
Jelsoft Enterprises Limited.
vB Easy Archive Final ©2000 - 2009
- Created by Stefan "Xenon" Kaeser
