youzguyz wrote on 09/17/13 at 13:19:10:Serowbot wrote on 09/17/13 at 09:41:44:I'd be thinking it is carb related... sticky slide...leaky or not seated slide diaphragm...
Something affected by low engine vacuum...
I had this experience.
Fairly easy to check.
Pull the boot off between the airbox and the carb so you can see inside the carb with the engine running.
Open the throttle and watch the slide to see if it rises.
If it doesn't or is slow to do so, try tapping on the slide with something that won't mar the surface. If it jumps up, the slide is sticking.
If not, you probably have the leaky/poorly seated slide diaphragm.
You can put something like a wooden stick in there and lift the slide manually, and the engine should rev up.
My problem was a hairline crack in the diaphragm. The only way to see it was to hold it up to the light.
thanks for your ideas guys! so, what else have I taken, once again, I cleared my carburetor. reviewed the condition of the diafragm and slider, as advised YouzGuyz. even tried to check the work of the slider using a vacuum cleaner.
I clutched the cleaner to the outlet of the carburetor, which is sent to the engine, I turned on the vacuum cleaner and turned the air valve by hand- slider raised approximately half-way. can of course vacuum cleaner poorly creates a vacuum.
as I looked, like a slider jams. even checked the compression, just in case. measurements showed me 850 kPa...
in General I still confused... I have "itching" to put jet idling larger and raise the needle jet...but for now I think-"and why did this happen?"