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951 accelerator pump issues

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electroryan

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Long story short, Brought a 98 xp with a 951, got ripped off and engine was rooted. did a full rebuild. then had problems with carbs.

accelerator pump was seized. Got a new one. Ski goes well untill 3.5k rpm, then bogs down and dies. Some times if i pulse throttle i can get past that 3.5k rpm mark and it goes super well , as long as i dont drop below 3.5 rpm...

Have had carbs off and professionally cleaned twice. have completely cleaned fuel tank, new lines and fuel filters.
Havent used ski in a year as never works and already spent more than it cost me, today i checked accelerator jets and they dont spray fuel in carbs. Put a bit of fuel directly into intake of accel pump and it sprays. I took the intake hose off and there is no blockage in the intake recharge jet.

So theres a problem with fuel coming out of the side part of the carb.

Wondering , can block it off, Split the incoming 3/8 main fuel line and Tee it off to a 1/8th and put a continuous fuel line directly through recharge jet into intake of accelerator pump....???????????

Also, its not had the airbox on since i brought, the last idiot put the carb plate on upside down so that the airbox now cant attach, and i cant take it back off as screws are stripped !


thanks ( ready to set ski on fire )
 
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I dont see how it can be the diaphragm in the accelerator pump.... The accelerator pump works but fuel is not getting to it on the intake side ( where its fed from carb ) thats why i was asking if i can directly feed it a separate fuel line...
 
I believe it has to come from the pump as it feed to the diaphragm under pressure.
Other option is remove the accl pump and fit larger low speed jets.
 
Best option would be to clean out the port on the carb that feeds the accl' pump though.
The pro' cleaning is normally ultra sonic and that won't clean out a blocked port.
 
The accelerator pump only shoots fuel from idle to get you off the line. at 3500+ RPM, it's not part of the process at that RPM.

I'd check compression, fuel lines, carbs, spark plugs, raves, and water regulator.
 
Do yourself a favor and just delete the accelerator pump altogether. It will be a constant pain as you make changes and attempt to tune. You can simply unbolt the pump, cap the feeds or install a primer and reuse them, and install a conventional SBN cap. Deleting the choke at the same time is a good choice as well since you'll be able to pull and remove your carbs with just 4 bolts, 2 fuel lines, and 1 cable to remove.
 
JMHO,
Re routing lines, removing parts, deleting and adding something different is just covering up the problem, band aid if you will.
I believe the best thing to do is a proper diagnosis. Take the time to figure out just exactly where the problem lies before band aids are applied. I think the OP needs to find out why a perfectly good fuel pump diaphram pumping enough fuel to make the ski run will not pump fuel into the accelerator circuit. Clog?
After the problem is solved, then maybe try rejetting, choke delete etc.

Providing compression is good, a good place to start would be things like "carb plate" on backwards. ??? No spark arrestor (air box) will definitely make a difference in how it performs as they are jetted for the air box to be installed. (Usually will see bogging around 3500rpms)
If it were me I would pull the carbs and properly rebuild them using only genuine mikuni parts making sure the pop off pressure was set correctly. You could also purchase new carbs from OSD parts. A little pricey, but probably worth it. Good luck.

Almost forgot proper cleaning is paramount for success.
 
On the ones I have done it has been the small check ball that allows fuel into the accelerator diaphragm cavity then closes to force fuel out to the carb sprayers. Typically this ball gets stuck and won't let fuel in.
 
Agreed. It also sounds like there is more problems just from the first post that need to be worked out in order to get a proper running ski.
 
I've never been a fan of the variability in fuel delivered by the accelerator pump. I would rather run a linear, perhaps slightly rich, low circuit curve than run a lean low circuit and rely on the unreliable accelerator pump (both in function itself and volume of fuel delivered) to even things out.
 
zuminazx said:
I've never been a fan of the variability in fuel delivered by the accelerator pump. I would rather run a linear, perhaps slightly rich, low circuit curve than run a lean low circuit and rely on the unreliable accelerator pump (both in function itself and volume of fuel delivered) to even things out.
Click to expand...

So, what kind of ski/s do you have? You haven't added them in your profile/avatar.
 
I currently have 2 XPLs (1 single pipe, one twin), 1 HX VE920, and 1 96 XP but have had several X4s, XPLs, GSXLs, and one GTXL in the past. I haven't owned an RX yet and I grew up riding my father's 96 GTi and GTS.
 
So i took the ski for a quick test on a small lake and it actually went well for once and didn't bog down at all . I didn't have the airbox on it and had taken the recharge jet off the intake to the accelerator pump.
 
I cant put the airbox on as the guy i brought it off seems to have put the metal plate that holds the carbs straight , Upside down so that the airbox cant clip on and the heads of the screws are stripped. Can it be slightly tuned so it doesn't run so lean. Yes i took out the little fuel restrictor recharge jet that goes between the primary of the accelerator pump and the feeder from the carb
 
Do you get any hesitation or bogging after idling in the water/no wake zones for a while then accelerating? I get that without the recharge jet.
 
You're flirting with disaster without an airbox, a proper rejet, and with a rigged up accelerator pump. Either completely eliminate the pump, switch to some kind of FA, and rejet or purchase a good set of OEM carbs and restore everything to factory settings.
 
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