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1998 xp 951 new to me. Flame arrestor?

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Mainman857

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Hey new here and newer to skis. But I bought a new to me 1998 xp 951 ski good compression ran great started right up hit 66-6800 rpm on some full speed runs. But after I got home I noticed there is no flame arrestor at all on the ski. Just open carbs. I ordered some ProK flame arrestors. Now I'm reading that going from the stock arrestor to these you need to rejet. But it ran good with no arrestor would it still need to be rejetted? I have no clue on the current jets and can get pics of the plugs tommorrow if that helps. Starts right up in under 1 second with no choke.

Any help would be great.

Thanks
 
You were running really lean. Water ingestion will absolutely kill a 951. You are much better off getting a stock airbox. You will not get any performance from aftermarket air cleaners if the ski is otherwise stock.
 
Ok only ordered these cus they where easy to order and looked very easy to install.
How would I know its lean. What color would the plugs be?
Also forgot to mention the ski was converted to pre mix with a rebuild 4 years ago.

Any signs when riding that its lean?
 
It sounds like you have some sorting out to do! Unless you’ve got some experience tuning carbs and reading plugs, I’d skip the prok’s and but a stock airbox, bracket, and flame arrestor. I’d also consider putting the oil injection back on the ski. The stock system is super reliable, and it’s far more likely that you or someone else forgets to mix the oil or grabs the wrong gas can than the oil pump fails...
 
I'm ok with the premix cus I'm the only one using the ski and clearly lable everything.
Il find one on Ebay and order it. Is there a parts diagram on here I can use to make sure I get everything.

Il get a pic of the plug color tommorrow its parked at my buddys shop up the road.

Thanks for the replies so far
 
If it;s mildly lean it'll run like a scalded cat right up until it roasts a piston. If it's chronically lean it will hesitate and fall on it's face like it just ran out of fuel, snapping the choke will recover it if you're quick enough. This is also lean enough to roast a piston.

Personally, I'd run the plastic factory air box, there's a clip assembly at the top that holds it on the carb throats, rubber o-rings around the carb throats make a loose but effective seal to the 1-piece air box housing.

There's a bracket mounted low, to the starter I think, or right next to it, that has a pin to hold the airbox at the bottom.

If you can;t run the air box, might consider opening the high speed mixture screws a little to richen up the top end, maybe adding enough fuel to shoot for a 200RPM drop at WOT to indicate there's plenty of fuel.

It's preferable to run the factory air box though, IMO.

Plug color will be dark, maybe sooty, if you were just putting around.
 
Without the airbox you will be really lean at 3/4 throttle where it needs the strong vacuum signal and you will roast a piston. The HS screw will not compensate for this.
 
Ordered a stock airbox last night. In the diagram it didnt show anything in the air box. How many filters are in therr?
 
Havent got pics of the plugs yet. But got the stock airbox installed. Because I have no idea of the jets in the carb how would I tell if the ski is now running to rich?
 
Mainman857 said:
Havent got pics of the plugs yet. But got the stock airbox installed. Because I have no idea of the jets in the carb how would I tell if the ski is now running to rich?
Click to expand...

The jets are engraved with numbers on them as well, so you can always pull the metering block and physically check them if you have questions.
 
How long does it take to pull that block? I'm not very expreanced with carbs but my buddy is but hes also a very busy guy. The carbs are under the exhaust does that need to come out first?
 
Wow lots of info there. I did get the stock airbox and it is installed. We have a rain/thunderstorm weekend in my area this week so no riding this weekend but deffently this week I'm gonna take it out. Is there a diagram of the carbs how do I know what is the high vs low speed screw?
 
I errored and apologize, the hi's are on bottom, I use a very thin long flat bladed screwdriver to set the low speed pilot screws from the top. You will need to remove the rubber water intrusion flaps first. Take a photo first, it's easy to invert those flaps..It's not easy...Google the pilot settings, and repeating myself, sounds like yours is calibrated and carb'd well. Light brown to slightly darker brown plugs is perfect. Re member, that the carb settngs (pilots), have plus or minus variances indexed to accommodate all weather situations.
 
Since you are on premix, the previous owner did that because he didn't know why the motor failed, ( could be a plugged micro filter in the carbs, leaking oil lines, or failing oil pump, or water intusion, a common failure for 951's).To reinstall the oil pump it is a very very very difficult job, you will have to remove the exhaust pipe, in one piece, not an easy job for even experienced techs. So, just premix.
 
Yeah sticking with premix. Sucked out the old.gas and put fresh gas in for my first ride after buying it tonight. Make sure everything is all set for the next 4 days!!!!!.

I put the stock airbox on but noticed I dont have the little snorkels that come off the box. Is that a big deal? Just curious.
 
Yes, you need all the snorkels and rubber flaps. You should also have the exhaust pipe "diaper" that was part of a service bulletin if you don't already have it.
 
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