PYF
07-06-2006, 03:29 PM
Hi everybody...Since I bought my 250 3 months ago, I had a lot of fun but have never been able to be spot on on jetting.
Since I bought it, I rebored it .040 over, installed new pistons and rings, ported the cylinder and shaved the head. I also run open air box and a FMF pipe. Funny thing, I just discovered yesterday I had a PWK (Never made the link that the stock one was a PJ)...Don't know what size though, will measure it shortly...
The main problem was probably the mid range. Let's say I'm rolling slowly and pin it WOT in a higher gear, It would absolutly bogs and sputters until it hits mid-rpm...I just lowered the needle and It cleared the problem wonderful. But I'm still having some small problem pissing me off...
It cuts a little on top end in the first 3 gears if I pin it WOT. If I rolls in high gear in 1/4-3/4 throttle, I hear a sound that looks like little bubbles popping. Am I still too rich on the needle ?
The plug is a nice brown chocolate, but it stills cuts a little on top as I said. By the way, when you pin your 250 WOT on neutral, does your rev to the moon? Mine kinda hit a rev limiter (Does the 250 have a rev limiter ? I don't think so...)
So right now my setup is like that:
155 Main Jet
2th position needle
50 Pilot Jet
2.5 Turn On Air Screw
1200 feet over sea level altitude
Today the temperature was 64 and cloudy
I know it's a little harder to help me since I don't know what size carb I have but I SUppose it's a 36 or 38 :S
Anyways thanks a lot in advance for your help fellow 250r riders,
Pierre-Yves
Since I bought it, I rebored it .040 over, installed new pistons and rings, ported the cylinder and shaved the head. I also run open air box and a FMF pipe. Funny thing, I just discovered yesterday I had a PWK (Never made the link that the stock one was a PJ)...Don't know what size though, will measure it shortly...
The main problem was probably the mid range. Let's say I'm rolling slowly and pin it WOT in a higher gear, It would absolutly bogs and sputters until it hits mid-rpm...I just lowered the needle and It cleared the problem wonderful. But I'm still having some small problem pissing me off...
It cuts a little on top end in the first 3 gears if I pin it WOT. If I rolls in high gear in 1/4-3/4 throttle, I hear a sound that looks like little bubbles popping. Am I still too rich on the needle ?
The plug is a nice brown chocolate, but it stills cuts a little on top as I said. By the way, when you pin your 250 WOT on neutral, does your rev to the moon? Mine kinda hit a rev limiter (Does the 250 have a rev limiter ? I don't think so...)
So right now my setup is like that:
155 Main Jet
2th position needle
50 Pilot Jet
2.5 Turn On Air Screw
1200 feet over sea level altitude
Today the temperature was 64 and cloudy
I know it's a little harder to help me since I don't know what size carb I have but I SUppose it's a 36 or 38 :S
Anyways thanks a lot in advance for your help fellow 250r riders,
Pierre-Yves