Bancheez Posted April 8, 2008 Report Posted April 8, 2008 (edited) Well fellas, i changed quite a few things up this year and i am looking for some jetting suggestions. I went from a stock port 4mil w/a 36pwk, to a F.A.S.T. 4mil play port w/a 39pwk. In the 36pwk, i was running a 45 pilot, eek needle, & 195 main in 70-80 degree weather. Now i will be running this 39pwk in about 60 degree weather. I ride between 1200-1800 ft elevation. thanx for any and all info. :beer: Edited April 8, 2008 by Bancheez Quote
Snopczynski Posted April 8, 2008 Report Posted April 8, 2008 I would try the same thing for a starting point. Quote
Snopczynski Posted April 9, 2008 Report Posted April 9, 2008 You over carbed it also. We run a pwk 35 on the 4 mill dune bike. We run a 38mm lectron on the 460cc 7 mill cheetah motor. I would have stuck with the smaller carb. Quote
jbooker82 Posted April 9, 2008 Report Posted April 9, 2008 You over carbed it also. We run a pwk 35 on the 4 mill dune bike. We run a 38mm lectron on the 460cc 7 mill cheetah motor. I would have stuck with the smaller carb. Yea that is what I was thinking. People that think they need to run a PWK39mm because they think the 35mm is holding them back. In all reality if the 35mm is holding them back on the top end then they should switch to dual set up like PWK33's. Quote
Snopczynski Posted April 9, 2008 Report Posted April 9, 2008 dual 28 flat slides will have almost the same bottom end power with more topend power than a single 35mm pwk. Quote
Wildcardracing Posted April 9, 2008 Report Posted April 9, 2008 dual 28 flat slides will have almost the same bottom end power with more topend power than a single 35mm pwk. Then why do you run a single yourself snop??? Just curious :shrug: Ease of tuning?? Lighter throttle?? Just to be different?? Quote
Bancheez Posted April 9, 2008 Author Report Posted April 9, 2008 I didn't get rid of the 36... It just got put on the shelf. I was looking for a 38 or 39mm carb for my tri-z project, and i ended-up getting a pair of 39 pwk carbs off a 2000 xc700 for $45. So, i just figured since i had an extra 39 laying around, i would give it a shot. If the 36 is the way to go, that is fine by me, as i already have a few seasons of jetting the 36, and have a pretty good idea of where it needs to be in different temps. I personally run the single carb because of the AMAZING ease of tuning, and i don't run on the top-end that much, so the small amount of lost top-end you get with a single carb, doesn't bother me... I still spank the 450's :biggrin: Quote
Snopczynski Posted April 9, 2008 Report Posted April 9, 2008 The top end you lose with a single setup is huge not little. It is 4-5 hp at around 8600 rpm, that is a huge number. Its an 8% increase in power just running twin carbs. Last time I ran my motor on the crank dyno I squeezes an extra 7 hp out of it just by bolting on twin carbs and carbon tech reeds in stock cages. I also added the dyna cdi and coil now. SO I think I will be looking at around 69-70 hp out of my 350 this summer. Here is a pic of my bike in the garage last week. You tell me which carb setup I am running. Quote
jbooker82 Posted April 9, 2008 Report Posted April 9, 2008 If Snoop ditched the single setup that should tell you something. Quote
Wildcardracing Posted April 10, 2008 Report Posted April 10, 2008 Sorry snop, guess I just assumed you were still running the single setup. I personally don't think duals are that hard to tune, I think some people are overly intimidated by syncing them. That's the only tuning difference, jetting is the same...just have to pull 2 carbs, extra 10 mins is worth the power IMO Quote
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