I put everything back in, went out for test ride. Let it warm properly first. And then tried WOT, results:
# It revs much faster when using clutch or no gear in.
# Very aggressive rev/acceleration when in high range rpm.
# Much more apparent stuttering (hestitation) in midrange, its like its starved for fuel when WOT around 4-5k rpm. With that I mean it is not smooth power transistion as when above 8k rpm.
What can I learn from this? Is jetting bad for such fast power surge when wot?
Countinuation of latest reply!
Ok, went out for another ride. Still same symptoms, motorcycle do not bog. It's just like when riding against heavy winds. Acceleration do not have linear power output all the way, there is weakness there and there. As if it would be starved and not getting full fuel power as needed. Mid-range is where problem lies. No hestitation or bogging when idling and wot.
Pulled out the spark plugs and they look like this;
I know Zephyr 750's are oil and air cooled, so they generally runs hotter than nowadays fluidcooled machines. However if you ask me, I would say it runs too lean/hot. I think the carb setup is original/untouched.
However it's just a laymans give and take.
So before going to clean carbs and s*** which is just bothersome, I would like to add S1 injectioncleaner and rejet to make it go richer.
My questions, what jetting should I go? You who have no holes in slide in US, which jetting? Help me!