Mackington Posted February 1, 2018 Report Posted February 1, 2018 (edited) Hello Everyone! So just as I dialed in the jetting on my stock carbs I found a deal on a pair of 28mm Keihin PWK's. My question is where do I start with jetting? Current Stock Carb Settings: #27.5 Pilot Jets#350 Main Jets#4 Toomey Needle Position (from bottom)Air Screws 1.5 Turns Out Here is my list of Engine Work from the CT Racing 400cc Stroker Kit: Toomey T5 Pipes Toomey Perfect Jet Kit Needles TORS Removal Kit & Carb Caps Vito’s Hemi Head V (Pro Design 19cc Domes Cut for 4mil) Timing plate (set @ zero for 91 pump gas) Pro-X Blaster pistons MX Porting Hot Rods 4Mil Crank CFM Aluminum Air Box (No Lid) K&N Pod Air Filters with Pre-Chargers Chariot Billet Intake Manifold VForce 4 Reed Cages OTHER VARIABLES: Altitude 5,258ft (Colorado) Temperature: 65 Degrees Compression: 150-155psi Thanks in advance!! Edited February 1, 2018 by Mackington Quote
Ayesully810 Posted February 1, 2018 Report Posted February 1, 2018 (edited) u talking about those ones on fb for 275 with filters? if so good deal they look clean. also im curious to see who will be the first to comment on the t5s most run a jjh needle i think in the 28s... 45 48 50 pilots and some 145 148 150 152 155 main jets. I could be way off bc ive never tuned 28s before only 35s and stockers. But its prolly gunna be around there some where. Start fat on the main and work it down. Edited February 1, 2018 by Ayesully810 Quote
Mackington Posted February 1, 2018 Author Report Posted February 1, 2018 Thanks @Ayesully810 ! That's exactly what I was looking for. I needed an idea of what range of jets to buy lol. These are indeed the carbs from the swap page haha. Sick of the ripping the stock ones apart! Quote
Ayesully810 Posted February 1, 2018 Report Posted February 1, 2018 10 minutes ago, Mackington said: Thanks @Ayesully810 ! That's exactly what I was looking for. I needed an idea of what range of jets to buy lol. These are indeed the carbs from the swap page haha. Sick of the ripping the stock ones apart! yeah when i had my 35s i just bought an assortments of everything 40-58 pilots and 135-160 main jets that way its all covered. Good luck post some pics of the new motor too Quote
Mackington Posted February 1, 2018 Author Report Posted February 1, 2018 Cool thanks again! I'll post updated pics ASAP. Are there specific part numbers I should be looking for? I am finding TONs of different ones haha. I usually order jets through Vito's Performance. Do these part #'s seem right? https://www.vitosperformance.com/atv_parts/product.php?productid=700&cat=222&page=1 https://www.vitosperformance.com/atv_parts/product.php?productid=726&cat=222&page=1 Quote
Mackington Posted February 1, 2018 Author Report Posted February 1, 2018 AHA! I found a page that explains everything! https://www.jetsrus.com/carburetor/carb_keihin_PWK_series.html Quote
97Screamer Posted February 1, 2018 Report Posted February 1, 2018 I second Tony's answer. One of my bikes is a stock stroke dune ported with the rest of the mods the same as yours on 28 PWKs. I settled on 48 pilot, 152 main and jjh middle clip. I bought pretty much the exact range of jets that were suggested. Jetsrus is a good source also, I've bought tons of jets from them in the past. Quote
Mackington Posted February 1, 2018 Author Report Posted February 1, 2018 Thanks @97Screamer ! I just ordered a bunch from RMATV. They had them for pretty cheap! I will report back with my findings. Quote
97Screamer Posted February 1, 2018 Report Posted February 1, 2018 Just now, Mackington said: Thanks @97Screamer ! I just ordered a bunch from RMATV. They had them for pretty cheap! I will report back with my findings. Were you able to find jjh needles on RMATV? I recently ordered some through Jetsrus because I couldn't find them on RM. I forgot how much paying for shipping sucks! Quote
Mackington Posted February 1, 2018 Author Report Posted February 1, 2018 (edited) 3 minutes ago, 97Screamer said: Were you able to find jjh needles on RMATV? I recently ordered some through Jetsrus because I couldn't find them on RM. I forgot how much paying for shipping sucks! Lol yea the shipping adds up! I did not find those needles but I did find the mains and pilots I needed. I called the guy who built my motor at CT Racing and he said to use the Toomey needles I have in the new PWK's. He also mentioned I should start at 35 Pilot and 140 Main for this motor at my altitude. Edited February 1, 2018 by Mackington Quote
97Screamer Posted February 1, 2018 Report Posted February 1, 2018 Damn, I completely missed your altitude. Sorry, glad you talked to him! I'm at sea level. Quote
Mackington Posted February 1, 2018 Author Report Posted February 1, 2018 3 minutes ago, 97Screamer said: Damn, I completely missed your altitude. Sorry, glad you talked to him! I'm at sea level. Hah no worries! Better rich than lean lol Quote
Ayesully810 Posted February 1, 2018 Report Posted February 1, 2018 (edited) yeah your gunnna be on the leaner side of it since your high alt. u if try and 152 main and it wont rev for crap then uill know lol always better to start rich and work it down Edited February 1, 2018 by Ayesully810 Quote
Mackington Posted February 3, 2018 Author Report Posted February 3, 2018 New airbox awaiting carbs 😀 Quote
Ayesully810 Posted February 3, 2018 Report Posted February 3, 2018 i think those alum. air boxes are sweet Quote
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