so i have a 2017 800ex when i first bought the machine there were no problems, naturally i did a full service before riding season had begun, i now have a loss of engine power in high range particularly if i encounter a hill of any good elevation also flat land seems to be lacking power as well, i used all recommended service items and am at a loss as to what i should look for or where to start looking

[2015 Z Force 800 53/Trail EPS]

How may miles on it so far and what air filter are you using?

2900 miles, has a uni air filter on it with 2 foam materials and a tight mesh fabric cover that goes over it, weird part is i didn't have any issues with anything until i serviced that machine

[2015 Z Force 800 53/Trail EPS]

2900 miles, has a uni air filter on it with 2 foam materials and a tight mesh fabric cover that goes over it, weird part is i didn't have any issues with anything until i serviced that machine

And what did your servicing entail?

Service consisted of oil oil filter spark plugs, air filter was not in need of being replaced

So upon doing some testing I found both my fuel injectors are working and supplying the same amount of fuel to each cylinder, did a compression test and found that there is a 60psi difference between cylinders

[2015 Z Force 800 53/Trail EPS]

So upon doing some testing I found both my fuel injectors are working and supplying the same amount of fuel to each cylinder, did a compression test and found that there is a 60psi difference between cylinders

No good. Loosing a cylinder. Do a leak-down test.