KLE 500 engine jerk
 

I have problem with my KLE 500 year 91. The engine "jerk" after throttle was pull to begin running from 1st gear...only. Means that from idle timming to around below 3000rpm or at low speed. After 1st gear and above its runs normal. Its was very unconfortable while dealing with heavy traffic condition or city ride. Anyone pls advise, TQ

This is probably a fueling issue but just what I'm not sure. As this happens at a partly open throttle setting it may be your float level is too high making it rich at small throttle opening but OK when traveling faster with bigger throttle openings. Have you just recently bought this bike? Has this surging always been there or just now started to surge. If it has always been like this since yoy bought it it's maybe and only maybe because of big main jets.
What do others suggest?

Southern Cross

TQ BRO..for information its just happened..after I get problem with the oveflowing carb due to dirt stuck at Float Valve. When I opened the carb and I did some adjustement to the Float Lever intend to minimize the Fuel Level...Im not so sure either to twist the level Up or Down...as long as the overflowing problem solve, but i got the Jerk problem now...May be what you suggest above are correct, my Carb level are too rich..

Float level is very important so achieve smooth fuelling. It appears your carby is getting too much fuel at a small throttle opening and is "flooding". Google the carby model and you should find a measurement for setting float height. The 'Tang' pushes onto the needle which closes the 'seat' and this controls the level of fuel in the bowl. Remember the adjustments must be careful and small.
Good luck!

Tq so much for the advised, i have made an adjustment to folat level. The problem is solved...Im happy!!!