Honda NSR Stuttering(Solved)

[Haoxian]

Hi

I seem to have a problem with my NSR125 R Build 2000.
I did a rebuild of the bike, i will give a short list.
renewed barrel,piston and bearings, replaced CDI and power valve controller rejetted the carburetor, mounted a open exhaust.
Cleaned carburettor filters on carb and in the gas tank, calibrated the power valve (it's spot on).
cylinder and piston had there running in period i have now 800KM on the clock with the new parts.

Now for the problem the bike works fine until its around 7000RPM at full throttle then it begins to stutter this sounds or feels not like when the bike is to cold and and need to warm up it's more like when you are out of gas but not that long it's just for a few puffs and then it takes off and works fine again when i give onley half throttle it does not stutter and goes slowly but nicely over the 7000RPM and then i can full throttle aal i want no probs then, it's like he's dead for a beat or two and then it's alive and kicking again, it's is always a around the 7000RPM when the power valve opens so i thought the problem would be there but i checked and rechecked, even calibrated several times it is spot on the mark so unless the markings are wrong i don't see the problem the servo is working in correct order to.
Carb is cleaned twice already so i doubt if there is any dirt in there same fore the filters in the carb and gas tank. Fitted upgrade kit from dellortho for the nsr 138,42,65 even tried a 140 main jet, also tried putting the needle in the carb on different hights (using the notches). I tried to set the pilot screw from 3 1/2 turns out to 1turn out with increments of 1/4 turn. the gas level in the floater bowl is at the required height of 24mm. Choke is working fine (got high rpm at start and when choke is put on at warm motor motor stops running). also mounted a new spark plug and the cap.

Ok try ed to explain as good as possible i hope this is clear enough for you to understand the problem, if there are any question's...
Awaiting tips and idea's from you... i hope you can help me

Kind regards,
Haoxian.

[tshort2007]

Main jet in the carb is incorrect size. Do a plug chop at full throttle and adjust accordingly.

its probly too small after upgrading your exhaust, as the more open exhaust lets gasses flow quicker, but the fuel being held back by the small jet

[Haoxian]

Hello,

The problem is solved, after checking and rechecking i rechecked the rechecking wrote everything down on a piece of paper when the servomotor of the rc valves was turning and in what direction at witch RPM then i looked at the valves, the plate where the cables are connected whith the axel of the rc valves and noted the changes at the different RPM's. Then i compared the gathered information whit the NSRTips.doc written by Alains. I noticed before that the servo wa turning in opposed direction so when the servo should be on high it went to the mark low (mark on the servo mounting plate) i presumed i needed to switch the cables to get it working in the right order.
This was a mistake, everything was spot on but working backwards, switched the cables an now it is running fine.
I just bought the bike and the guy i bought it frome had did some work on it he already had switched the rc cables thats wy i made my mistake. the doc of alais helped me allot to clear this out.
Thanks Alains, tshort for trying to solve the problem.