Z645 low top end rpm's

B

Bdym

Forum Newbie
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)
 
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.
 
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/.
 
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.
 
Last edited:
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??
 
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