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Found 2 results

  1. I just got a JD jetting kit for my fcr39mx. Supposedly these are supposed to be genuine keihin jets but some of them have the K start and others don't...For example, the 155 main jet is labeled AB155 no K star mark anywhere the pilot jet has a 42 printed on it but no K star, the 160 and the 170 mains do have a K star. Are they all genuine Keihin jets or have I been given some fugazi fazool jets???
  2. I've been trying to get this FCR dialed in and it hasn't been easy. Some days I think I finally got it, then I notice another issue and get lost again. Sea Level - SF Bay Area - 50-75 degrees weather First Attempt Fuel Screw around 1.75 turns out EMN - 3 45 pilot 100 pilot air 160 main 200 main air RS-2 w/o spark arrestor K N air filter 3x3 Stock engine The pilot circuit was rich as the choke made the bike run worse and couldn't be used. Bike always started without choke. Hanging RPMs in idle, idle not consistent. MPG dropped significantly, hesitation when shifting, part throttle (1/8 to 1/2) sputtering. Fuel screw all the way in did not stall the bike...instead the further out I turned the fuel screw the lower the idle was and eventually turning out would stall the bike... Pulled the carb because I was pretty sure I had an extra oring stuck inside the fuel screw circuit. Found the oring and carefully removed it then tried second jetting attempt below Pulled the spark plug and it was fuel fowled changed the spark plug Attempt 2 Settings same as above except needle changed to JD Blue-3 w/ 42 pilot and Spark arrestor silencer back in. Hard for me to determine which circuits were lean/rich but it felt worse than EMN. The choke was usable now but not still seemed too rich when used. RPMS would go up when choke was out then soon the bike was too rich and RPMS dropped and bike would stall (only during warm up). Not using the choke bike starts and idles decently. It definitely had a buzzy 2 stroke feeling in most throttle positions seemed lean in the 1/2 to WOT throttle positions. I changed the clip position 1 clip richer. Got on the bike and felt that I nailed the jetting seemed great! As it warmed up and I rode it for a while the conditions grew worse. Had a lot of stumbling and hesitation and turning fuel screw in all the way once again would not stall the bike...Pilot too rich even at 42?? I pulled the spark plug and this time it was not fuel fowled but it was black soot Attempt 3 JD Red Needle clip 4 Just didn't feel right at all... Attempt 4 Went back to EMN needle in clip 3 w 42 pilot and Spark arrestor silencer out.... This is where I am now...Hesitation when shifting. Cant reach above 6500 rpm in first gear without the bike struggling. Lots of stumbling in partial throttle positions. Plan is to try some different needles...NCYR? EMP? NCVQ/S Please give me some advice...Also maybe buying some pilots and mains...155, 158, 162 mains, 38, 40 pilot, adjustable pilot air screw? Factory pro tuning is 20 miles from my house and they are FCR experts...Its just that service costs over 400 dollars and I don't really wanna spend that much...Id rather buy some hot cams... Factory pro does sell this special emulsion tube but it says not for aftermarket fcr mx carbs supposed to help with lower partial positions. My emulsion jet is 49.5 mm...has anyone any knowledge about this emulsion tube... Removing pilot air??? Carb is new from TT store FCR MX 39... Please help me decide where to go from here and how do I get this thing dialed in??? I am riding the bike currently and it is OK but far from 'tuned' correctly...
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