Can you be more specific about the power drop
- does it only happen when you 'whack' the throttle, or does it happen also when you roll it on
*** Have to check it, but I believe also when rolling it on, will try tomorrow.
- does if feel like a kill switch, or does it feel like it's 'drowning'
***Feels more like a kill, Full power loss and than picks up power (when RPM drops a bit) en loosing power again....(shocking feeling, also very unpleasant to ride)
- can you get past it by babying the throttle
*** You mean like very slow increasing it...I will try....(same remark as with point 1, I think>)
- have you inpsected the plug/plugwire/stator pickup/kill button for possible arcing
*** Guess not the issue, because it did not occur before I changed cam shaft position (outlet earlier open). BTW the TOP Piston liner was not correct also before i worked on the bike. Therefore the inlet valve timing has also changed.....
By the way, I also changed the coils and the spark plug connector (damaged it while removing...). Why would this occur only at high RPM, I wonder?
- does you carb have an accelerator pump, and have you verified it is working
*** Yes it works and I have tuned it some time ago..(on the work bench).but to be honest am not so happy with the power when wacking the throttle at low rpm...response is also a drop in power. But its ok for my driving style.....
I guess can not the this pump as it occurs sometime after throttle is steady, full open....
The position of the camshaft is Now as in picture (Almost....), i believe that this is the proper WR setting.
For YZ the outlet is turned clockw. 1 teeth. This (YZ configuration) is more how it was...(however with wrong TOP Piston marker out of position, think it was counter clockw.), when there was not a drop in power....(before i worked on the bike)
One other thing. Yesterday I removed the Decibel Killer (in exhaust pipe)....to check if the mixture may be too lean....but removing this made not any real difference! Therefore I guess, tuning the main jet will not solve it....
BTW the bike starts fine, much better than it used to...Idle is perfect and runs ok when cold and warm in general...