Yep, should fire.
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My 1996 SPI Resto
- Thread starter Seadoo Tuner
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Seadoo Tuner
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Back to working on this project, Carb is off to clean and it was pretty dirty :
Got all the corrosion off and cleaned up pretty good though and the other pulse side where the little filter is was quite clean, even the filter was ok.
Unfortunately, one of the 2 inner screws I need to take off is stuck and stripped, even tried notching with a dremel and using a bladetip but wont budge and is stripped worse now. Other screw under the muck came off easily and I have the proper screwdriver as well. Tried soldering iron heat trick and also lots of PB blaster over 2 nights. Looks like I'll have to drill the head off and hope I can extract the rest of the fastener.
Are there 1 or 2 jets underneath?
Got all the corrosion off and cleaned up pretty good though and the other pulse side where the little filter is was quite clean, even the filter was ok.
Unfortunately, one of the 2 inner screws I need to take off is stuck and stripped, even tried notching with a dremel and using a bladetip but wont budge and is stripped worse now. Other screw under the muck came off easily and I have the proper screwdriver as well. Tried soldering iron heat trick and also lots of PB blaster over 2 nights. Looks like I'll have to drill the head off and hope I can extract the rest of the fastener.
Are there 1 or 2 jets underneath?
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Seadoo Tuner
Member
Finally got the screw out! thought I would try one more time and use a cordless drill and more pb, tightened a bit and then unscrewed with my weight on it. Now to wait for the screws on order and finish cleaning. Looks like 2 jets underneath, a small one and a bigger one.
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Seadoo Tuner
Member
Picked up the screws today that the auto parts place brought in for me(Metric M4 philips head fastener 14mm long), .30 cents each (they're stainless steel as well). Local Sea Doo dealer wanted $8 each! Part number for the Mikuni screws just in case anyone needs them in the future is "C5=0414-G" but the M4 14mm ones fit as well and are much cheaper. Pics of the carb after removing stripped screw :
Seadoo Tuner
Member
Carb is back together, looked at the oil injection lines and they are original so out they come. All the local places seem to not have tygon line at all but another type that's everywhere, translucent yellow, made by Oregon who states :
Oregon Part Number: 07-261
- Oregon Fuel Line is a specially formulated gas and oil vinyl tubing - made
for use with lawnmowers, chain saws, and snowmobiles - Maintains air tight seal on fittings - even in extreme temperatures
- Translucent material resists swelling or hardening
- Compare to Tygon
Oregon Part Number: 07-261
Seadoo Tuner
Member
Picked up the Tygon line at Home Depot and installed, cleaned out the fuel selector valve, changing fuel lines and am wondering about the vent line - do I need to change it and do I need to test the check valves in the two ends of the vent line setup? As I understand, these are the only check valves in the fuel line system in the SPI.
I recently replaced my gray vent lines only because I was having problems. I wouldn't worry about the gray lines but if you do... be gentle with the fittings. I cut the gray lines off because I knew I would break them if I kept struggling with them The valve check is simple.... just apply a little pressure they shouldn't leak. They only allow air in one direction.
Seadoo Tuner
Member
The fuel selector valve? Mine wasn't dirty actually and it was functioning but I put some cleaner thru it anyway. Have seen others say theres were gunked up.Why do you recommend replacement instead of cleaning and would that be only if its gunked up?
Seadoo Tuner
Member
Thanks for the explanation, will order a new one.
How about the vent line check valves, does one let air in (top?) and the other hull side one let air out?
Seadoo Tuner
Member
Ready to put carb on today, the 2 intake to carb nuts I have are non self locking with lock washers - Mikuni manual states use flat washers with self locking (nylocks?) nuts. Mine were not very tight when I undid them, guess nylocks are beat to retain torque and flat washers better to clamp evenly the carb to intake.
Hmmmm..... when I applied pressure to the carb return line the air would come back out the return line. It was pressuring up the fuel tank. I didn't read how much pressure was on the fuel tank though. but it seemed strange to me.
THe factory uses lock washers and standard nuts. You will be fine
All of the ones I have seen pop at 3-5 psi except the HX. For some reason is just has a check valve going in under the seat area and a check valve going out at the bond line so the tank doesn't hold any pressure.
I will give that a try. I sure thought it was strange. If the tank pressures up won't that slow down the return line and back pressure the carbs? If this happens would this pressure be enough to decrease fuel flow? I'm just asking but we loosened the gas cap when having problems and it had no effect. We had other issues but this may still be a lingering problem.
Seadoo Tuner
Member
So after carb cleaning and istall the SPI started up fine and I ran for 15 seconds 4 consecutive times so all seemed well. Cold started it 4 days later and ran fine and stalled after 15 seconds and wouldn't restart anymore. Pulled carb and rechecked everything including taking out needle seat this time and checked needle which looked fine. Re-installed and was hard to start and when I finally got it restarted had to keep applying throttle to keep it going, lots of smoke and oil and gas out the exhaust.
Is this a needle and seat issue? Was running fine when it would start the other times but after I checked the seat this time its running rough and needs throttle to keep it going.
Is this a needle and seat issue? Was running fine when it would start the other times but after I checked the seat this time its running rough and needs throttle to keep it going.
Seadoo Tuner
Member
Yes, genuine Mikuni parts, and no popoff done as I don't have the tool/gauge.
Needle and seat are original, is there a way to fix if they're sticking which would be the issue for them leaking possibly? Saw online some fixes by polishing inside seat and the outside of needle to stop them sticking/leaking.
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