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Need help 99 gsx/rfi

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Trac3

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Hey guys first time posting here.... Here's my story I bought a 99 gsx/rfi took it out on the lake it ran fine docked it to let me gf ride it and it won't start... It seems like it has a hard time startin in water? Pulled it out of the water and it started back up however when I gave it throttle it seems like it was kinda spongy? Took it to the mechanic he said it might be my inner crank seals however that's an expensive thought cuz jus to replace the crank it was gonna cost me a pretty penny... Any ideas on what it could be? Sorry to bore you guys with my sob story but I thank you for taking the time to read it

Btw I put an oil block off kit in it so I'm currently running premix I've read it's not the best thing to d however I've only been running premix for a couple of days...my compression is at 140psi in both cylinders the ski starts and runs fine until it hits the water :(

Thanks for an opinion
 
something keeps telling me, that you can not block the oil supply/pump assy, do to the fuel injection system.
 
Ya it's been at over going arguing in a few forums :/ but do you think that would cause my ski to act like this? :(
 
You CANNOT switch a RFI over to premix because then the rotary valve will not have any lubrication. It will be spinning dry and then you'll start wearing down aluminum off of the cases and rotary cover. This aluminum "dust" will go into the engine and turn into a silver mud.
Needless to say it will cause running problems and engine failure.
 
Dennis said:
You CANNOT switch a RFI over to premix because then the rotary valve will not have any lubrication. It will be spinning dry and then you'll start wearing down aluminum off of the cases and rotary cover. This aluminum "dust" will go into the engine and turn into a silver mud.
Needless to say it will cause running problems and engine failure.
Click to expand...

Knew i was on to something...anyway, Dennis, looking at the diagram/microphishe, where is the injecotrs located. I try not to "service" rfi's, do to the complexity but if there located in/at the thrtottle body, then wouldnt it "spit" the fuel/air at the rv and its surface? :cheers:
 
Yea, SEADOOYA, you just asked the big money question!
The location of the injectors is the reason you can't premix. They're not located at the throttle body. Instead, they're on the other side of the engine mounted into the sides of the cylinders. They spray fuel into the transfer port so no fuel ever goes by the rotary valve like on a carb engine.
I personally made the BIG mistake of premixing a RFI a few years back. Within a couple of hours it started semi-fouling plugs, hard starting, etc.
I pulled the head for a look-see. Discovered the "silver mud' in the upper rings and cylinder head dome. I sat down, scratched my head, drank a couple of bud lights and thought about it. It took a whole six pack of thinking before I finally figured out what had gone wrong. I pulled the rotary cover and it was dry as a bone. I got lucky because no serious damage to the cases or rotary cover had occurred. I reinstalled the oil injection, rode it and it cleared itself of the silver mud. Won't ever forget it!!
 
You're welcome. Post readers always like it when I include the number of beers it takes for me to figure out my mistakes!!! :cheers:
 
Ok so i have no idea on what's wrong with this thing? and i was looking to do a leakdown test however this guy said that it's a little tricky to do a leak down test on a RFI? any idea why my ski is acting up like this? i put the oil pump back on checked my injectors they're all good :(
 
I dont have a lot of time working on RFIs, but the one I had ran like crap and wouldnt idle...turned out to be water in the gas tank.
 
Does it have the gray fuel lines in it sounds like what my ski was doin timings the gray fuel lines cleaned fuel selector and runs Like a champ
 
I did compression check its at 140psi across the board :\ ... i mean the ski idles good specially out of water... and when it comes to the fuel lines i'm not sure if it has grey fuel lines lol but here's the pic

17.jpg
 
Did you see Minnetonka's response? If it runs good sitting on a trailer but not in the water the angle change could be causing the pickup to grab from a layer of water in the tank.
 
Seems like good compression; fuel line issue does NOT pertain to RFIs.

Reading other responses I would prob. pull off the intake manifold and see if there is that grey stuff and clean it up. Dont unhook the throttle or anything, just take the aircleaner off, then the 4 bolts that hold the mani on. Make sure the rotory valve stays on the motor so the timing stays correct.
 
Last edited by a moderator:
Symtoms suggest the fuel system is lean. Suggest you clean all the sensors and
have the injectors professionally cleaned. More likely you will find the entire fuel
delivery system needs a maintenance cleaning. Remove your fuel module to get
all the old gas out and swab the tank. The modules fuel pump & filter needs cleaned
or re-placed. A HFFS-382 is about 80 bucs on ebay. Change *plugs. Use gas tank
additives to protect future performance = ethanol, moisture, & gas Stabilizer.
 
any of these symptom says that my inner crank seals are bad? :\ cuz that's what a mechanic is telling me ... however he hasnt done any test like fuel pressure test or leakdown test or whatever it might be he just told me that my inner crank seals are bad :\

but i guess having the fuel system serviced is not bad :) cuz as we all know im a noob lol this is my first ski and i have no idea on how to do any of these lol i gotta take in what you guys tell me and tell a tech to do it .. LOL:bigear:
 
Your "mechanic" is an idiot...the inner seals would have nothing to do with it. If they were bad your engine would be full of oil.

Were not saying it couldn't be something else (esp with it not being run with the oil pump), but typically on the RFIs most problems stem from the fuel delivery.

You were premixing? The fuel system was not made to inject gas and oil.
 
Last edited by a moderator:
Phew.... That saves me $1200 repair :/ thanks!!! So you're saying I should get my fuel system checked out right ?
 
Bill nailed it in post #17
You perform those tasks according to the manual and your ski will run more like you want it to run.

Crank seals my a**!! :bs:
 
aint outta the woods

Trac3 said:
Phew.... That saves me $1200 repair :/ thanks!!! So you're saying I should get my fuel system checked out right ?
Click to expand...

I'd be more worried about the internals. Do what Dennis mentioned, and pull the intake assy/manifold off, and take a peak.
 
After I reinstalled the oil injection it took 2 long rides and 6 spark plugs before the engine cleared itself of the "silver mud".
 
Ok guys fuel system checked well at least when I checked the injectors they were good both were squirting fuel however when i checked the sensors I didn't get a readin on a few

- air pressure sensor
- throttle position sensor
- crank shaft position sensor

And kind wise words? :(
 
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