Ah, I don't wish to offend but the JD jetting kit I just bought direct from JD Jetting for my new 08 FE 550 suggests 185 main with his red needle at 5. Also suggests a leak jet which comes with the pack but the Aus models don't have a leak jet (at least mine doesn't.)I haven't played with it yet, so I can't say how it is?
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regardless of A/F ratios the dodgy primary emulsion tube in the FCR (no holes along its length) seems to be more effcient when the primary restriction is the main jet orifice at the bottom of the tube rather than relying on a fat needle to restrict flow at the top.
lineaweaver suggests that a main jet over 165 is indicative of a restrictive needle.
a 185 main may work well with the stock 200MAJ and perhaps produce a lot of tourque but as the primary restriction is then at the fat JD needle and not down at the MJ, peak power will be down. perhaps not enough to put JD out of business but if you want a bit more power its in there waiting to come out without sacrificing the tourque provided the MAJ is adjusted accordingly. check lineaweavers gallery for a dyno of some of the JD stuff.
if the carb does not have a removable MAJ I suggest making it a priority to drill and tap the carb to allow changing the MAJ
regards
Bushie
lineaweaver suggests that a main jet over 165 is indicative of a restrictive needle.
a 185 main may work well with the stock 200MAJ and perhaps produce a lot of tourque but as the primary restriction is then at the fat JD needle and not down at the MJ, peak power will be down. perhaps not enough to put JD out of business but if you want a bit more power its in there waiting to come out without sacrificing the tourque provided the MAJ is adjusted accordingly. check lineaweavers gallery for a dyno of some of the JD stuff.
if the carb does not have a removable MAJ I suggest making it a priority to drill and tap the carb to allow changing the MAJ
regards
Bushie
Thanks Bushy and Taffy, I have now drilled for the leak jet. I drilled a 0.80mm hole which I think is equivalent to an 80 leak jet. If that is too big I will tap it and insert a smaller leak jet. It now seems to run much cleaner at low revs. Previously it was loading up in tight single track. I'm running the JD jetting but I will now start to experiment with it.
tried the 175 clip 2 pretty good now on a 182 on clip 2 even better! engine seems to like the extra fuel? pulls harder top end and comes up in 2/3rd with a blip of throttle. std 160MJ with std needle was just pony top end felt ok but would not wheelie in 2nd def not 3rd!
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