emoguitar131
Member
- Aug 20, 2005
- 10
- 0
Okay guys, before I ask a jetting question, I just want you all to know that I've read all the articles/searches/links about jetting and think I have somewhat of a grip on the subject, but I just want to make sure I'm right before I go making changes. :cool:
Anyway, I have a 93 KX 250 with about 10 hours on a new top end that has run pretty good since I got it last year. The needle clip is in the top position, pilot is 50 (stock) and the main is a 165 (one bigger than stock). I use the stock slide and a plug one step hotter (8). I just cleaned the carb and installed a moose reed cage spacer. Well, I started it up today (using about 3-week old 36:1 93-oct gas) and it was smoking a good amount. I rode it down the street with the choke off and about 6 seconds into the ride, it started to backfire and lose power. I think if I would have kept the RPM's up it wouldn't have fouled, but alas, there I was on the side of the road. Pulled the plug, yep, fouled sure enough.
So I'm trying to get this jetting thing down and it looks like I'm running rich somewhere, right? Could the main one step larger be causing this condition? Also, I thought backfiring was a lean condition? I'm a little stumped because it has never fouled a plug before. Any suggestions?
Anyway, I have a 93 KX 250 with about 10 hours on a new top end that has run pretty good since I got it last year. The needle clip is in the top position, pilot is 50 (stock) and the main is a 165 (one bigger than stock). I use the stock slide and a plug one step hotter (8). I just cleaned the carb and installed a moose reed cage spacer. Well, I started it up today (using about 3-week old 36:1 93-oct gas) and it was smoking a good amount. I rode it down the street with the choke off and about 6 seconds into the ride, it started to backfire and lose power. I think if I would have kept the RPM's up it wouldn't have fouled, but alas, there I was on the side of the road. Pulled the plug, yep, fouled sure enough.
So I'm trying to get this jetting thing down and it looks like I'm running rich somewhere, right? Could the main one step larger be causing this condition? Also, I thought backfiring was a lean condition? I'm a little stumped because it has never fouled a plug before. Any suggestions?