Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
2kHondaCR500R:
You KX500 guys are not alone with having problems jetting the PWK. I have a 2000 Honda CR 500R I put a Sudco PWK 41mm Pro on and so far have gone down to a 45 pilot and still can't get an idle without the slide/idle screw all the way in and like 2.5 turns out on the AS. Anything over a 52 pilot and I have to hold the throttle open because it will not idle.
I find the jetting odd with the PWK 41mm needing smaller jets than my PJ 38mm, but I think it has something to do with the design and the PWK getting a better vacuum signal to the jets.
I have the DGH needle which I think is too rich in there right now on the 2nd clip. With a 52/172 jetting and 3rd clip it spooged out every connection in the exh system. It eventually fouled a BR8EIX plug too. I tried 52/170 jetting and still spooged, but barely got an idle with the slide screw all the way in and like 2.5 out on the AS.
I've got a few PJ carb needles (Honda part numbers) I'm going to try and I'm going to buy some smaller pilot jets to see what goes. I will keep you posted on that progress. I also got a N82P needle CROGG off ATM sent me from a KX500 I'm going to test out.
For now I stuck the stock PJ 38mm on and it runs fine with it set to 55 pilot, 4th clip on the stock needle, and 170 main. :?
hoopty:
2kHondaCR500R, have you checked with Armpump over at CR500riders.com? He runs one of those PWK carbs and has it dialed spot on.
2kHondaCR500R:
--- Quote from: hoopty ---2kHondaCR500R, have you checked with Armpump over at CR500riders.com? He runs one of those PWK carbs and has it dialed spot on.
--- End quote ---
I haven't asked him directly, but anytime I post a "what is your PWK jetting settings" I get flamed with "no one bike will be jetted the same" and I do know that is true because of their porting, sea level, and mods, but I never got a base line to jet from over there because of that. It's all been trail and error for me on the PWK.
The jetting is too rich all the way around where I have it right now. Thursday I'll put the PWK back on, drop the jetting, try the KX500 needle, and the PJ/Honda needles to see which is best. I'll post back with results so we can compare how similar/different the CR500 is to the KX500 jetting.
:D
Timbowe:
Sounds like a trick machine you got there chap! You'll be hanging to get it sorted.
Rotorised:
Having just read this whole thread it sounds like alot of hours have gone into jetting some of these bikes, reflecting on the time spent would it be better to take the bike to a dyno and get it tunned there?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version