Reduced engine power after head replacement

R

rbarger

Member
History- 2005 RTV 900 1600 plus hrs. I've owned 5yrs. Lately I've noticed slight loss of coolant and discovered water pump leaking and small crack in head. Rtv ran fine with no loss of power or overheating. Replaced the water pump and a new complete head. Ran 30 min. let set over night retorqed the head and readjusted the valves on .006 ,flushed the cooling system, took th muffler off and cleaned it out, checked air filter.
Currently engine cranks and runs as it did previously but when you you pess the throttle down to the second stage the power is greatly reduced compaired to directly before the repair.I have notice an increased amount of black smoke when the power is lost. My thinking is it has to be something that changed because of the repair. I've checked everting I can think of [fuel system ect.] Any ideas would be great!
 
Hmmm Sorry about the problem. Someone smarter than I will pop in with an idea or two.
 
I had issues after replacing the head. Turned out to be the PCV mounted on the valve cover.

Instead of cleaning and trying to adjust the spring I replaced it with a new OEM part.

Ouch on the price. Sorry I cannot find the invoice but it was way more than a car PCV.
 
v10rick said:
I had issues after replacing the head. Turned out to be the PCV mounted on the valve cover.

Instead of cleaning and trying to adjust the spring I replaced it with a new OEM part.

Ouch on the price. Sorry I cannot find the invoice but it was way more than a car PCV.
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Thanks I'll check that today and advise back.
 
aurthuritis said:
black smoke is unburned fuel. check the governor spring
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Are you talking about an internal spring or external? To me it has to be something that changed during the head replacement. Are you thinking it's getting to much fuel? Would it hurt to run it with the exhaust diconnected to test for exhaust retriction? Ran it for awhile today ran fine with the exception of the power loss. Put a new fuel filter [no change].
 
internal spring. not sure though. black smoke is unburned fuel. to much fuel for the amount of air. have you checked the compression? i would check the injection timing and make sure the governor is functioning correctly check for air intake restrictions and make sure the fuel screw isn't loose tampered with
 
aurthuritis said:
internal spring. not sure though. black smoke is unburned fuel. to much fuel for the amount of air. have you checked the compression? i would check the injection timing and make sure the governor is functioning correctly check for air intake restrictions and make sure the fuel screw isn't loose tampered with
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Solved - Found the throttle linkage where it mounts in the bracket next to the fuel injection pump was not tight and jumped out of the bracket. Also I dicovered that I had failed to reattach the throttle return spring which was hidden from view under the stop solenoid. Everything back to normal. Thanks for the help.
 
Yep…thanks for returning with the solution. So many times folks tell about a problem…then fail to come back with the solution. (y)
 
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