SO bought the scooter a couple weeks ago, Its a 1999 aprilia sr50, It has malossi 70cc kit on it with 19mm carb 95main jet and stock exhaust. The bike runs like a bat out of hell, pretty impressed for a gas and go. the catch is the bike wouldn't idle very well and when taking off it would bog down to a stall (too much air) unless you rolled the throttle a bit or rode the bike with the choke half way on. Sometime while at red lights or stops i would have to put the choke on in order for it to idle and or take off. once dealing with take off the bike would run amazing and get to 63mph very fast, clean, and efficient, with no mid or high range problems...
so me and a friend decided to start trying to tune it, we noticed the carb was pretty dirty and cleaned it very well, and raised the needle one click. after assembling the bike and going for a ride it right away runs like shit. It idles great now and takes off perfect with out the help of the choke but 1/4-1/2 throttle it spits and chokes bad (too much fuel) and will not speed up past 30mph even when full throttle and past the sputtering. almost feels and sounds as if it sucked down the air filter, or lost its MAF (if it had one, like the feeling when a cars goes out) So we put the needle back to where it was before and it still had bad sputtering and power loss, like it cant breath or get air. funny as it sounds i wish the carb was dirty again and hitting 65mph.
What could of possibly happen? does the ecu need to be remapped? did we pinch a vacuum line or fuck up the ignition or electrical system? could it totally be the carb? will an aftermarket exhaust clean it up? maybe a 21mm carb? im so clueless and irritated that overnight this all happen?
What do you all recommend or suggest before i take it to the shop and drop some cash? I want it to get back to 63-65mph fast clean efficient and be able to idle and take off fine just like other gas and goes!!! HELP! What are some of your setups?