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Discussion Starter #1 (Edited)
Hello

2018 RZR XP4 1000

Went through a mudhole, engine felt like it lost power or bogged while in the mudhole.

After that, wouldn't rev past 5900 in High or Low, but would rev higher in Neutral

waited a full day, in case water was somewhere and just needed to dry, still wouldn't rev pas 5900 in high or low.

I then power washed the entire machine, and it has driven fine ever since .... Like instantly, while leaving the car wash it was night and day .. WHAT THE HECK WAS THE PROBLEM ?

There was no water in the oil.. .
 

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Discussion Starter #3
Where the air intake screens covered with mud? Engine starving for air?
I'm embarrassed to say I don't even know where those are .. I just bought the machine last week, this was my first ride..

do you have any pics of where they are ? Maybe I washed them out without even knowing then huh ?
 

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Top of bed, behind roll cage bar. Have a very fine mesh on both sides. Engine on passenger side. Clutch on drivers side. Would not take much to plug them with mud. Will also cause clutch overheating and earlier belt failure along with starving engine for air if they get covered.
 

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Discussion Starter #5
OK, I googled air intake screens, your talking about the black sides of the rear cargo box then correct ?

Attached is a picture of how it looked when it wouldn't rev above 5900...

Does that look muddy enough to cause it ?
 

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Discussion Starter #7
I'm glad it was something that simple, not anything major.

I only drove from the mud hole to the trail head.... so hopefully nothings damaged ..


Would that cause engine damage at all ? It would of had to overheat first correct ?
 

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Good news is the system kind of takes care of the less air as it has an air flow sensor. So it cuts back the fuel to match the air. Since it is running at less power then the clutch is also working less creating less heat. Nothing should be the worse for wear from this. A good learning experience to wipe those screen off when you can.

Enjoy your ride. Suggest adding your location to your BIO. It helps when asking question to know what part of the country you are in. Mudding has it's own unique set of wear issues that is not common for other users.

Always be sure to carry an extra belt and tools to change it. If this is a new 'used' rig for you, suggest you purchase a new belt from Hunterworks and install it in your garage and keep the old one as a spare. Without a history you have no ideal the condition of the belt. Mudding can eat belts quick. If this a new rig then just carry a spare belt. Also add your machine to your bio is a big help as well.

Welcome to our incredible great outdoor experience .
 

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I would add that if you power washed those screens, a lot of mud and water ran down the intake tube to your airbox. There is a one way air valve that is at a low spot in the tube to let water out when not under vacuum. It may be worth giving it a squeeze to be sure no dried up much chunks are blocking it, and also check the air box for mud/water contamination from the power washing.



I actually removed that cover on my XP1000 and replaced it with a 3" PVC street 90 painted black with screen at the inlet. Turned it inboard on the machine and never had mud clogged intake issues again. Although I must say, even when the screen was completely clogged during riding, I never had an engine power issue. I changed it just to keep the airbox clean.
 
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