Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Keihin PWK Questions
Reply to thread
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
[QUOTE="Canadian Dave, post: 676213, member: 16102"] Zerotact what I mean to say it that there are a number of modifications I would make to the bike before I got too carried away with bigger ticket items like the RB carb mod. Don’t get me wrong it works very well but, for example, I’d replace the stock pipe with a rev pipe on your 220, tweak the suspension, which often times means stiffer fork springs, have Eric Gorr modify the head etc before the carb mod. What I’m suggesting is to do things in stages ensuring that each additional modification enhances the previous mods to ensure you get the biggest bang for you buck once you are all finished. If you find the cost of the modified carb to be out of you price range you might consider having your 33mm carb bored to 36mm to improve top end power delivery. Any competent motorcycle/sled machine shop will be able to help you with that. Expect to pay about $50-65 CND. If they need details on how to bore just ask though any experienced shop will know what to do. bclapham that might well be the case with a large body PWK (over 35mm) I’d have to take a look at my 39mm PWK to know for sure. The jet block and throttle valve on standard off the shelf small body PWKs as well as those used on 1994 and older KDXs uses a flat bottomed slide and flat topped jet block where the A.S. and PWKs on 1995 and newer KDXs uses a jet block with two fang like dams cast into the top of the jet block so the top of the jet block makes up a round shape to match the bore of the carb rather than dropping down to a flat area like the standard PWK. The bottom of the side on the standard PWKs is flat with a cut out for the jet screen, plus the standard cut out to direct air over the jet screen at lower throttle setting. The A.S. slide is concave on the bottom to match the profile of the reshaped jet screen i.e. fangs but are otherwise the same. The Nozzle heights are slightly different on both as well. The standard PWK’s jet screen is 0.5mm lower, if memory serves me right, I’d have to check my log book to be sure of that measurement. I have installed a 39mm PWK on the YZ and to date its working MUCH better for what I use the bike for than the power jet equipped PWM it came with. I’m sure that’s mostly due to the fact that I have much more experience jetting standard PWKs and have a mess of single taper needles, slides etc. to work with plus its easier to jet given I don’t have to deal with the effects of the power jet. My goal is to jet out as much of the hit as possible for the smoothest power delivery I can get while retaining crisp throttle response especially at the transition between low on mid throttle settings. I’m sure given an investment in additional slides, 2x taper needles and power jets for the PWM I could get similar results, perhaps better results, with it as well and I’ll very likely do that some time in the future but for now I’ll do a little more fine tuning on the PWK. I wish the carb was more accessible on the YZ and the jets/needle easier to get at. I was spoiled with the KDX and could easily make a dozen different jetting/needle adjustments on a short ride as all you had to do was loosen the clamps on the front and back of the carb, unscrew the cap and rotate it. There is lots of clearance on the KDX, not so with the YZ :( [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Keihin PWK Questions
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom