Z645 low top end rpm's

[Bdym]

2014 JD Z645, 2300 hrs. The top end throtle speed appears to be down 500+ rpms. Idle is fine.
Changed fuel filter
Cleaned air filter
Seafoam thru carb (never could make it stall)
Drained gas & ran 1 gal thru system with seafoam added
No improvement
Change plugs? (Original)

 

[hlw49]

Is this something the just happened all of sudden? Or is it something that you just discover but has been that way for a long time? It could be a fouled plug on one cylinder though. Try pulling the plug wires off one at a time and see what happens.

 

[Scrubcadet10]

i'd check to be sure your throttle cable hasn't slipped in the clamp. you'll probably be able to see a weather mark on it if it has slipped/.

 

[STEVES]

2300 hours & never tuned???

 

[eldowdy]

My Z445 has 600 hours. I've changed the plugs 10 times.

 

[Scrubcadet10]

guys, where did he say he never tuned up his mower?

 

[StarTech]

Have you adjusted the valves. This ZTR came with either a Briggs 44 series or Kawasaki FS730V engine. Kawasaki engines can go a long between valve adjustments but they still need adjusting at times.

 

[STEVES]

2014 JD Z645, 2300 hrs. The top end throtle speed appears to be down 500+ rpms. Idle is fine
Changed fuel filter
Cleaned air filter
Seafoam thru carb (never could make it stall)
Drained gas & ran 1 gal thru system with seafoam added
No improvement
Change plugs? (Original)
From Bdmy post:


Well, never changed plugs, so never had complete tune up??