Gg 450fsr 2010
 

I have a odd problem with My bike. Im looking for ideas what it could be.

The bike runs fine while idle. If I turn the throttle slowly it revs somewhat ok. But if I turn quick it wants to die. Something like it's choking itself. I feel like I've checked everything.

Kind regards Jocke. And appreciate any ideas and tips

Gg 450fsr 2010
 

Old gas? How long has it sat? When was the last time you pulled the carb and dissembled and cleaned it?

Agree with hadfield.start with carb clean and fresh fuel.iv had a partially blocked main jet cause similar,and also if you have sucked some water this can happen.check tank flow/filter also.I'm assuming you have a clean/new air filter,decent condition plug/lead.while you're on the carb check your float level is ballpark and all the breather tunes are clear.

This bike should be injected

Well clean the injector then.

It is a injektor indeed. Sparkplug is brand new.
I measured the valve clearance. According to a service manual the intake tolerance is 0.10-0.15 and exhaust 0.20-0.25

I couldn't get the 0.20 blade under either of the two valves on the exhaust.
At the intake I could get 0.10 blade in perfect and at the other I had to use a 0.15 blade to fit perfect

It also feels like it heating up to much as if it wants to start to boil. But water is circulating fine.

Injector cleaning something one can do by one self? Or perhaps it's best to drop it to a workshop

Try taking the injector out and take it to an auto
Shop that has an ultra sonic cleaner. Should fix the issue!