![]() Same as with adjusting the needle, except running at WOT, preferably under a load, for as long as you can. The difficult task is knowing which way to go, and how far to go. Easy enough to fix, simply change the main jet. Most people refer to raising/lowering the NEEDLE, info only. If you feel your bike coughing/spitting, she is probably FAT and you need to LOWER the needle by RAISING the clip position (when giving or reading tuning advise, be very careful to note whether you want to RAISE/LOWER the NEEDLE, or RAISE/LOWER the CLIP, cuzz they have the opposite effect. ![]() your probably LEAN, and you need to Raise the needle by LOWERING the clip position. If she tends to Pop Pop Pop or you feel the engine SAG off, then pick up again, then SAG off again (like Lunging forward/back). not an easy task unless you know what to listen for. Take the bike out for a decent NO LOAD, CRUISE speed at about 1/2 throttle (steady), 4th gear. both the needle taper (so choose your needle wisely) and needle 'clip position' alter this jetting. Off idle and/or Mid range adjustments can best be handled by the Needle, but since all of the carb circuits tend to overlap, the fuel screw, slow jet, and main jet, will have a small effect on this. this adjustment is usually performed in the garage. Then start this procedure over until the fuel jet is adjusted correctly, and it falls between 1 and 3 turns out from seated. If you find the Fuel screw at less than ONE turn out from lightly seated position (go with next size SMALLER slow jet), and if out more than THREE turns, go with next size LARGER main jet. This is usually about as close as your gonna get depending on other issues. once MAX rpm is obtained, back this screw out about 1/4 turn (based solely on my experiences). open screw up to about 3-4 turns out and begin turning this screw IN/CLOCKWISE slowly while listening to the RPM of the engine. Idle jetting is controlled with Slow jet and Fuel screw, along with the choke mechanism (most know what the choke is for so I will skip the details).common rule is to adjust your idle setting (not speed, which is adjusted with the black idle speed knob) first using the fuel screw. thats about it.Ġ6/newer came with 120 main jet, #42 slow jet, non-adjustable NHHU needle, 2 3/8 turns out on Fuel Screw, #70 leak jet.ignore the #75 starter jet.Ġ6/newer HRC jetting is 162 main jet, stock slow jet, NGPR needle on 3rd groove from top (all adjustments on needle are considered from the TOP and/or ROUND (not pointed) portion of the needle), #55 leak jet, turn fuel screw 1/2 turn IN from stock (1 7/8 from seated position) and turn acc timing screw (1/2 turn OUT from stock) both of these screws are a special 'D' shaped head, so you need the appropriate tools and/or modifications to these screws (such as cutting a slot in them) in order to adjust them.this requires the LID to be REMOVED or highly modded.įrom Idle or starting to WOT application. the FUEL SCREW (aka Pilot Screw.NOT Air-Fuel or Air screw or A/F screw) should be set near 2 turns out to begin.Ġ4/05 HRC jetting is 185 main jet, stock slow jet, special 'opened up' HRC style LID. There is no removable Leak Jet (aka Acc bypass jet). Hence the reason for the massive changes in jetting between all corked up (stock) and uncorked (lid removed or modded) between these years.Ġ4/05 came with 118 main jet, #48 slow jet (aka Pilot jet) and an adjustable needle. while the 06/newer machines work very well with their factory intake and filter. Let me also say the 04/05 machines suffered from a bit of a 'restrictive' style intake and filter. The stock 04/05 machine which utilizes a 42mm Keihin butterfly/slide carb, and the 06/newer machines which utilize a 40mm FCR (Flat CR style carb). Lets start with the basic/stock jetting: Before we begin, at this point in time, there are basically TWO different machines when it comes to jetting. So, what I purpose, is a PINNED thread, which will allow most people to understand jetting, determine jetting needs, view what the most 'common' jetting is and/or questions, and if all else fails, give proper guidelines as to the INFORMATION (including proper terminology) needed for us members to post ACCURATE jetting information for those who need answers. Most of you agree there are THOUSANDS of some type of "jetting questions" on the Org.Īnd I have spent my share of time trying to answer many of them. ![]()
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