It used to hit 180 k,with an open road in front of me,can't do 180 anymore,whats up with that?J.B.
Yeah mine was struggling in the top end department with standard jetting etc...like it couldn't get enough breath,so i had the baffle & snorkel removed,several dyno runs & ended up with 136 mains.All I've done is take out the end baffles,maybe its the speedo cause it seemed to get up to 170 pretty quick,then started to creep upJ.B.
Plug readings dont tell you anything with the gas we got now.If see what you think is right you more then likely are way rich.put the bike on a dyno or use a a/f meter thats the only way to know what right.These bikes are lean to begin with. If you knock out the baffles you free up the breathing and might need to up the size of the mains one or two jet sizes. Do a full throttle plug chop and I bet it indicates lean.
Well, my guess on what has happened is.....All I've done is take out the end baffles.
Yeh I can dig thatJ.B.Well, my guess on what has happened is.....
Apart from removing exhaust gases, the pipes on a bike perform two other main tasks. The first I think is attenuation of sound and pressure waves of the exhaust (attenuate roughly means to reduce). The second is to resonance tune the system, which from memory is to modify the amplitude of the vacum (and pressure) waves so that they arrive back at the exhaust port at the correct times.
Off the top of my head I would suggest that since for resonance tuning the exaust gas is likely travelling at about 100m/s and there are pressure waves traveling at about most likely around 500m/s. Those pressure waves were reflected back and used to tune the emptying (scavanging) and filling of the cylinder. Your removal of the baffle as probably thrown this out of kilter since it will have effectively changed the diameter of the pipe likely resulting in a loss of power.