Cr250 pwk jetting. Keihin needle jet inner hole diameters 2. It also tells how to decide on changes of straight section length, diameter, and taper angle. I'm running at 5,300 ft elevation and 80 - 95 degree temps. I ran the 289 needle (2000 CR needle) but I wasn't 100% happy with it, bought the JD kit and got what I was looking for (their needle was the ticket in my case). Also great for custom builds, big bore kits, and modified engines. I started out with a 40 SJ, DDJ needle 2nd clip and 170 MJ. One of the easiest ways to work through your jetting frustration is to not view jetting as one big mystery. Sep 5, 2025 · Keihin PWK carburetors is the dominant carb on the factory motocross machines. Do your searches, decide which needles you want to try and get a few of them and experiment until you find what you like. Thanks. Applicable vehicle models: this carburetor is fit for YZ250 RM250 CR250 KX250 CR500 KX500. Or you can just buy a cheap set of 20 jets from Amazon if you want to save a few bucks and don't need a special needle. Easy to use: the carburetor adjusts the air mixing ratio, which is more fuel-efficient and more reliable in use. All the CR250's are going to like similar jetting so it won't matter what year the thread refers to. Keihin PWK carburetors is the dominant carb on the factory motocross machines. 5 days ago · Honda CR125 / CR250. Click here to go to my page with more about Keihin needles and my free spreadsheet decoding them. A lot of people have assumed that L1 is the length of the straight section, but it isn't. 5 slide, DDJ needle. Same goes for the 01. I wanted to put a spare pwk on it and show my brother the difference. Planning a trip to Kaneville Utah with some family that has some cool bikes, one being an 04 CR250. It's no secret that Honda's Mikuni carbs on their CR two-strokes in the 2000 era are poorly jetted from the factory. The carb was from an 03 kx250 and came with a #8 slide and NAFF needle. I looking for a copy of the jetting table from the manual (2000 CR250). Many people are intimidated by carburetion jetting. Fits For YZ250 RM250 CR250 KX250 CR500 KX500 PWK 38mm Air Striker Carburetor New Features: Compatible with OE part number: 016-167. GENUINE KEIHIN PWK 38MM C arburetor Comes jetted for HONDA CR 250 Producing power without compromise The motocross world knows PWK. The Carburetor has been pre jetted with stand 125cc jetting, #172 main, #48 pilot, custom #7. Nov 16, 2007 · Keihin Carburetion Jetting figure 1 The following information is offered as a guide for a practical interpretation of the workings of Keihin PE, PJ, PWM and PWK carburetors. Here are our jetting suggestions for your CR250. I bought the carb through JD jetting with the jet kit and am using their recommended settings, below. This url below links to my free spreadsheet for decoding Keihin needles and finding another needle to buy. Below is a screenshot of my spreadsheet for Keihin carbs (PWK, PJ, PE). Needles for Keihin carburetors Click here for my jetting calculator for Keihin PWK/ PJ/ PE carbs. 9mm for PWK33-39, PWM38, PJ34-38, PE36, FCR28-41 2. Also has a new top end. Apr 12, 2018 · Hi guys, Im looking for some suggestions for jetting a PWK Airstryker carb on my 2006 cr250. It fired when cold a couple of times but would die very quickly without applying constant . Kawasaki KX125 / KX250. Jul 9, 2025 · The Keihin PWK air striker carb conversion is a great way to make save you time and hassle of fiddling with the jetting. If the PWK air striker is the better option, am I better off just buying one from the Honda dealer and jetting it myself or buying one from JD Jetting? Thanks! Nov 18, 2015 · More Op - Did you install the PWK on your '91 yet? I'm having issues getting an '89 CR250 running that I just put a PWK 38 on. We’ve spent countless hours of testing to determine which settings work best when bolting on one of our pipes and silencers to a stock machine. 6mm for PE26-28, PWK26-28, PE20-24 Heres what PWKs are often equipped with: Needle Data for PJ34-38 PE35-38 Jetting Keihin carburetors Click here for my page verifying the jetting calculator for Keihin PWK/ PJ/ PE carbs. Below the instructions here are the needle and needle jet info that you will need to know such as the inner diameter of the needle jet of your carb. Yamaha YZ125 / YZ250. Suzuki RM125 / RM250. Jun 15, 2016 · We've had the bike for a few years and I found it to be jetted pretty well as I ride lots of wide open throttle, but now that my dad is riding it using more low end and mid range he finds it lacking. Anybody have one, please post. Jetting should be broken down into many small questions, which Feb 23, 2010 · Just thought I'd start a thread for us Keihin swap'd 01+ CRs listing the jetting specs to help others out with a starting point for getting their bike on the right path for jetting. I'll start: 06 CR250 with 38mm PWK and TPS from 2005 YZ250 (Mods: FMF short Jan 9, 2019 · Have many people had good results with the JD jet kit in the mikuni? I’ve looked all over for a S7 and S8 nozzle with no luck. ? What’s Included. Sudco Keihin 38mm PWK Air Striker carburetor. Jan 13, 2011 · 02-07 will benefit from the same jetting with a PWK swap (changed for your particular mods / altitude / weather of course). I keep running into an extremely rich sputter off idle up to 1/8 or 1/4 throttle and then lean on up. Post your mods, altitude, and gas type. Because of their great performance they come stock on a lot of the leading brand bikes. Jul 9, 2025 · Motosport offers a JD jet kit for PWK carbs - you just have to call if you want them to give you specific jet sizes and needles for your CR125 or CR250 setup. I was Jun 13, 2006 · I've got an '01 CR250 engine with a Keihin 38 mm PWK air striker (basically the '00 CR250 carb) and a PC Platinum pipe. jje ghe mmm wyj djl qtz akm lnx sak gxp wdt hjn qgd nyp ynh