I have this issue on a 21 uforce 1000. I do have a full DFK cab. Would the weight of that affect the machine that much? There has been a handful of times where it has opened up and felt like a whole new machine. Floor it and RPM hovers 5300-5500 then climbs slowly as speed slowly increases

That's how mine worked with my cab on an 30" tires clocked to c1

I've now changed my clocking spring an weights
Now it's a whole new ball game
No lack of power anytime

So you originally tried clocking at C1 and it didn't help? I read stock is clocked B1..
Stiffer spring and what gram weights?
Thanks for the info

I clocked to c1 with no cab an 29"
Tires it struggled then so

I now run
200/1600 spring
#0951-1017
18g weights 
An clocked to b2

I ordered all from revco in Canada weights an spring
A 1/4 of the cost of a "kit"  with the same parts lol

Gotcha! Thanks for the info, I will look into it and hopefully be doing that!

I have this issue on a 21 uforce 1000. I do have a full DFK cab. Would the weight of that affect the machine that much? There has been a handful of times where it has opened up and felt like a whole new machine. Floor it and RPM hovers 5300-5500 then climbs slowly as speed slowly increases

That's how mine worked with my cab on an 30" tires clocked to c1

I've now changed my clocking spring an weights
Now it's a whole new ball game
No lack of power anytime

So you originally tried clocking at C1 and it didn't help? I read stock is clocked B1..
Stiffer spring and what gram weights?
Thanks for the info

I have this issue on a 21 uforce 1000. I do have a full DFK cab. Would the weight of that affect the machine that much? There has been a handful of times where it has opened up and felt like a whole new machine. Floor it and RPM hovers 5300-5500 then climbs slowly as speed slowly increases