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Honda MX & Off-Road Dirt Bikes
Attn: 2002/2003 CR250 Keihin PWK Converts
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[QUOTE="pace, post: 807615, member: 48746"] Installed the PWK on my '03 this morning. It's a pretty straightforward swap. No significant clearance issues, although I did remove one of the overflow tube guide/retainers since it was a little closer to the shock spring than I'd like. I'd say this carb qualifies as a 'direct swap'. Nothing has to be hacked or replaced to make it fit. The stock '03 throttle cable is a little longer than would be ideal, but I was able to take up all the slack with the knurled adjuster. Since I wasn't able to get hold of the jetting chart from the MY00 owners manual, I made educated guesses on initial jetting based upon the input of others. All my riding is between 5,500ft and 6,000ft above sea-level. The carb came installed with the 2000 CR250 specs, including a #180 main and #48 pilot. I changed this to a #172 main (-3 sizes) and a #42 pilot (-2 sizes). I moved the needle clip up one position from the middle to the second position. I set the air screw to 2.5 turns out. I'm on the stock #7 slide and stock A715/289R/A327/A487 needle. My house is situated at an elevation of 8,600ft so I was expecting the bike to be running way rich. It actually started first kick on the choke, and I was able to take it off the choke immediately. After a 5 minute warmup, I took it for a brief squirt. It's a little fat at WOT, but elsewhere felt surprisingly crisp. I obviously won't play with the jetting until I get it down to track elevation. I'll reserve final judgement until I have the carb properly setup at the track, but my initial impressions are very positive. The bike immediately feels snappier coming onto the powerband than it ever has on the Mikuni, and this at 3,000ft higher elevation. Exhaust gases look cleaner too. If anyone is interested in seeing the carb in situ, I can take a couple photos to show clearance, etc. -Pace p.s I premix Amsoil series 2000 synthetic at 36:1 with our (crappy) oxygenated 91 octane pump gas. [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
Attn: 2002/2003 CR250 Keihin PWK Converts
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