Joined
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34 Posts
Hello
I ride an 07 Honda CR250 modified for woods riding. I have recently purchased a 36mm Keihin PWK to replace my 38mm PWK. I have read that a smaller bore carb should provide better performance at lower rpm / throttle settings at the expense of some high rpm power.
After installing the carb, I have noticed some strange tendencies from my motor. It is blackening plugs and smoking like a very rich tune, but acting lean in some situations.
My question is what jetting changes would be expected from this 38mm to 36mm carb swap. My knowledge leads me to believe that a faster velocity / stronger signal would make the same jetting specs run richer on the smaller carb. Any thoughts?
I'm going to dive in tomorrow morning and pressure test the engine to be sure there are no outside factors messing with my results.
I ride an 07 Honda CR250 modified for woods riding. I have recently purchased a 36mm Keihin PWK to replace my 38mm PWK. I have read that a smaller bore carb should provide better performance at lower rpm / throttle settings at the expense of some high rpm power.
After installing the carb, I have noticed some strange tendencies from my motor. It is blackening plugs and smoking like a very rich tune, but acting lean in some situations.
My question is what jetting changes would be expected from this 38mm to 36mm carb swap. My knowledge leads me to believe that a faster velocity / stronger signal would make the same jetting specs run richer on the smaller carb. Any thoughts?
I'm going to dive in tomorrow morning and pressure test the engine to be sure there are no outside factors messing with my results.