Losing power

[GoldReaper]

It sounds like clogged high speed jets or some old gas,try some fresh gas with some sea foam mixed in it,check the spark plugs also,I would do that first.

I checked spark plugs there new no issues there as for old gas I tried sea foam and put gas in it nothing

You live in Ca. so the bike probably is a Ca. bike with Ca. emissions
A few things you can check
Check vacuum hoses and the emission system
also make sure the throttle body isn't loose and the air filter duct and filter has a good seal

But since your not experienced with working on motorcycles I suggest you take your bike to a Professional Motorcycle Mechanic

It's a washington bike I bought it in washington and rode in washington for 3 years before I moved back and it didn't have this issue till I moved to California

 

[ImpulseRocket]

What Ninja (250, 600, 650, etc)? How many miles? Is it carbureted or EFI?

Usually a loss of power once an engine gets up to temp will point to things like the valve lash being tight, especially when it runs good cold. Clogged jets tend to not run good cold worse than hot, so I wouldn't put my money on it being the carb(s) if it is indeed carbureted. That doesn't mean it couldn't be carburetor related. Clogged air passages and rubber diaphragms that harden with age can cause all sorts of weird issues. Any condition that would cause it to go rich would present itself as running good cold and then poorly when hot. You would have to do a plug chop and check the plug(s) to see if it is indeed rich.

If it's an EFI bike, again, start with valve lash, and then start looking into sensors. It could be a faulty knock sensor or temp sensor and the ECU is pulling timing trying to save the engine from damage.

 

[GoldReaper]

What Ninja (250, 600, 650, etc)? How many miles? Is it carbureted or EFI?

Usually a loss of power once an engine gets up to temp will point to things like the valve lash being tight, especially when it runs good cold. Clogged jets tend to not run good cold worse than hot, so I wouldn't put my money on it being the carb(s) if it is indeed carbureted. That doesn't mean it couldn't be carburetor related. Clogged air passages and rubber diaphragms that harden with age can cause all sorts of weird issues. Any condition that would cause it to go rich would present itself as running good cold and then poorly when hot. You would have to do a plug chop and check the plug(s) to see if it is indeed rich.

If it's an EFI bike, again, start with valve lash, and then start looking into sensors. It could be a faulty knock sensor or temp sensor and the ECU is pulling timing trying to save the engine from damage.

It's a 2006 kawasaki ninja ex650r with 34k miles in it I don't know if anyone has ever done a valve adjustment on it or not but I'm gonna look into it before anything