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How do you disable acceleration pump 951 xp
- Thread starter k_24
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MacAddict
Active Member
I recently did a top to bottom complete rebuild of my 2001 XP 951, including crank, counterbalance, re-jetting, adding PROKs and a host of other major mods, including accelerator pump delete. I physically removed mine and got a replacement plate from www.osdparts.com that matches the plate used on the other carb. (Bought full OEM carb rebuild kits from him that included stainless Allen screws, along a with this stainless plate/cover) One thing you HAVE to do after removing acc pump is to cap off the feed nipple on the carb that used to "feed" the acc pump fuel. I used a short length of 5/32 tigon fuel line folded over/crimped and double zip tied. If you don't do this, there will be fuel in your hull. I had originally used vacuum line rubber caps, but worried about the fuel eating it. I saw an immediate change in performance, with zero hesitation off the line anymore... and that was always something I fought with this engine. Especially surf jumping all the time as I do...
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scortpower
New Member
Any pictures of this? Something I'd like to do on mine eventually.
On a stock ski you can't just remove the accelerator pump, you will have to rejet the carb or it will have a bad lean hesitation out of the hole.
You will not gain any performance or more power from just removing the pump either.
If your pump is working correctly and crabs are clean there will be no hesitation or anything to gain from removing it. It will actually help performance and is why it is there because when you stab the throttle there isn't enough immediate strong vacuum to pull enough fuel and that is why they use the pump to give the engine a quick shot of fuel when it is at it's lowest vacuum and needs it the most.
Now if you do the aftermarket air filters and rejet and all the stuff that MacAddict did you will have an improvement.
Also keep in mind that a 951 will not tolerate any water ingestion at all so keeping the stock intake box and covers is a very good idea if you ever roll your ski or let novices ride it. In my opinion you should never put aftermarket filters/air boxes on a 951 unless it is your exclusive ski, are a very good rider and always flip it back over correctly and never let others ride it. You need to be very experienced like MacAddict.
You will not gain any performance or more power from just removing the pump either.
If your pump is working correctly and crabs are clean there will be no hesitation or anything to gain from removing it. It will actually help performance and is why it is there because when you stab the throttle there isn't enough immediate strong vacuum to pull enough fuel and that is why they use the pump to give the engine a quick shot of fuel when it is at it's lowest vacuum and needs it the most.
Now if you do the aftermarket air filters and rejet and all the stuff that MacAddict did you will have an improvement.
Also keep in mind that a 951 will not tolerate any water ingestion at all so keeping the stock intake box and covers is a very good idea if you ever roll your ski or let novices ride it. In my opinion you should never put aftermarket filters/air boxes on a 951 unless it is your exclusive ski, are a very good rider and always flip it back over correctly and never let others ride it. You need to be very experienced like MacAddict.
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MacAddict
Active Member
^ ^ ^ mikidymac Makes a great point in that a bone stock engine with big @ssed airbox doesn't produce enough vacuum... you have to open up the "throat" by aftermarket flame arrestors and re-jet to realize the effect of deleting acc pump. Removing it on a bone stock engine will likely end up with more problems than it was intended to solve...
Thanks as always mikidymac... :thumbsup:
No problem Mac, some of us like our skis bone stock LOL. Those that like to mod them like you have a whole new set of issues to play with :cheers:
I can say on my bone stock 2001 XP 951 with everything clean there is absolutely no hesitation with the stock accelerator pump. The thing rips.
MacAddict
Active Member
Oh there's no doubt our skis rock @ stock... sooooo much fun, especially jumping 3-4' surf out the inlets here.... but I am a tinkerer and love working on them, and I got a hell of a deal on a 97.5 Unicorn white pipe and manifold..... so being as she had 300hrs+ on the crank, I went "all in" and did a top to bottom rebuild with a bunch of the other mods + powder coating... now she is a freaking monster, pulling solid 7000rpms with 15/20 Solas on stock head. (checked squish gap before installing gaskets, etc. to ensure tighter than stock) 150psi both holes with SnapOn and MacTools testers...... I could not be happier with how it came out.... *giddy*
Now I just gotta finish the cylinder and case porting of my ZXi1100 mutant and get her back together....
MacAddict
Active Member
Thanks man... yeah... I need to, as I keep pushing it further and further... busted my lip a few times trying to stick the landings.... :face palm:
**off to search threads for helmet recommendations**
MacAddict
Active Member
BigTimeSolutions is you? :thumbsup:
Would love something like that with the visor and all, and could easily repair/repaint to match ski.... just wouldn't want the interior blue/purple...
I appreciate it though....
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No, just had one back in the day. They were a good idea with the liner but a pretty crappy helmet. Most surf guys now just use full face mountain bike helmets.
k_24
Active Member
thank you guys for your input i really need advice
so what would you recomend as a bolt on parts that will not harm but give me a lil more powaa!! you guys mentioned aftermarket flame arrestors ,any brand?
and rejeting should i do it wen i get my cards rebuilt ? i want to know what to tell the mechanic to do wen i bring it to him i want a great response from throttle on zero . i dont really care about top speed
so what would you recomend as a bolt on parts that will not harm but give me a lil more powaa!! you guys mentioned aftermarket flame arrestors ,any brand?
and rejeting should i do it wen i get my cards rebuilt ? i want to know what to tell the mechanic to do wen i bring it to him i want a great response from throttle on zero . i dont really care about top speed
MacAddict
Active Member
First and foremost, is this a DI 951? I thought 2001 was the last carb 951 XP.... If it is DI, thats a completely different beast and the carb changes (other than air intakes) do not apply. I am not even sure what to do with changing air intakes on a DI.
But if carb'ed, PROKs have some of the highest flow, and snap right on to stock carbs, but be ABSOLUTELY sure to get outerwears to go along with them to keep the water out of your intakes. Also make absolutely sure your seal under the white tray is solid, and that the lid is closing tight.
And yes... re-jet and carb rebuild at the same time. Different people have used different jet sizes, so I would suggest looking up Ben's Secret 951 mods for some advice there. You will also want to open the High Speed screw about 1/8 turn. (stock is 1.5 turns out for low speed, 0 for high speed) With the dramatic increase in airflow, not opening the high speed up will lead to lean piston seizure. I grabbed a set of long T-handle high speed adjusters for the stock Mikuni BNi to make it easier getting those adjusted/dialed in. I also deleted the acc. pump altogether, replacing it with a matching plate as the other carb.
In all honesty the 951 is pretty tapped out stock. You are risking a lot of reliability and trouble for a very very small gain. It isn't going to be a big amount faster. If everything is good and functional like I said on my stock 01' there is absolutely no hesitation or lag out of the hole.
The 2002 was the last carbed XP. 2003 went to DI.
If you don't care about top speed just leave it stock and enjoy it. If you have to have more power go with someone that has tested for years like a Group K Swift or Sleeper kit.
The 2002 was the last carbed XP. 2003 went to DI.
If you don't care about top speed just leave it stock and enjoy it. If you have to have more power go with someone that has tested for years like a Group K Swift or Sleeper kit.
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So true. All other manufacturers had to go to 1100 & 1200 triples to get that much power.
k_24
Active Member
Is di more powerful engine than the carb version ?
Because ib the specs it outpust more kw
SabrToothSqrl
Well-Known Member
The best thing to do to a 951 XP is the Solas Concord 15/20, and get everything 100% new stock...
Love my XP and it jumps like crazy. New engine + brand new carbs + new carrier bearing (last year locked up on me). plus a new jet pump... lol' it's a NEW ski!
Love my XP and it jumps like crazy. New engine + brand new carbs + new carrier bearing (last year locked up on me). plus a new jet pump... lol' it's a NEW ski!
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