1983
Well-Known Member
Well with all of the great FAQs and previous threads on this forum I have been able to fix 99% of the problems on my 96' XP :thumbsup:
I am having one last problem that I cannot resolve.
Issue:
It will not idle, way to rich on low end, if I let off throttle completely it will load up and engine will die. I tried raising idle today no avail. If I get out of the gas after a high speed run it loads up and bogs while I attempt to keep it running by feathering throttle on low end. It does and always has run great on top end. Busted out 55 mph last weekend. If I let it sit at dock for a moment or engine is off for a period of time longer than 10-30 seconds it is very hard to restart. I have to shut off fuel valve and continue to crank with throttle wide open to get some air into engine and try and keep it from fuel hydro locking. Its almost as if carbs are just still dribbling fuel into engine at low end, idle, and when engine is off.
History on ski:
Friend owned it wasn't using it and had upgraded to newer sea doos. I got the jet ski this summer to tinker with as a project. PO only complaint was it was very hard to restart after shutting it off and letting it sit. I diagnosed that and found that the fuel tank 1 way check valve near rub rail port side was stuck closed not allowing psi out of tank thus when hot outside the tank was pressurizing and forcing fuel into carbs causing a flooding of engine when off. Upper 1 way check valve beneath hood near hood latch striker was working fine but I still removed and verified it was allowing air into tank and not out as designed. In 2012 carbs were rebuilt, ign. coil was replaced, along with some other odds and ends that the PO mechanic did on it.
Things I have done since ownership:
Ski ran great first time out after replacing fuel tank 1 way vent valve. Every ride after that it had huge bogging problem. Changed all fuel and vent lines from old gray crap tempo lines to new automotive 1/4" hose and new clamps. Still had bogging after that. Finally found out that it was the rectifier. So no more bogging and ski has run perfect on top end since. Trimmed spark plug wires back, replaced plugs multiple times and gapped them correctly. Ski continues to foul out plugs and after replacing them it runs good for a bit but eventually they are fouled again from fuel soaked hard starts. Cleaned fuel arrestor with carb cleaner. Cleaned inner carb filters multiple times. Compression test passes at 148 and 147 psi.
Rebuilt carbs and replaced needles and seats. I did make sure that needle and seats lever arm wasnt raised above carb body by using a razor blade and making sure it was all flush per OEM specs so that the diaphram wasn't pushing on it keeping needle open while off. I put the 1.5 oem mikuni with viton needle and seats in carbs. Used all oem mikuni kit for rebuild from OSD. It ran great about 3 times after the carbs were rebuilt, I finally had a use for the choke haha when cold I used it and ski started right up! That was a huge relief. It started ok... to... better than before and I could definently let it idle all day, plus after WOT runs I could totally let off throttle and it would come down and idle without me trying to keep it running like before. I thought everything was kosher until today. Went riding with suke and idoseadoo and it started all over again. Extremenly hard starts, flooding when engine is off, but it ran really great on the top end. Pop off psi is 32 and 35 so that is within spec. PSI test carbs with pop off tester and they held psi great, and during rebuild really didn't look all that bad. Filters were definently dirty when I first cleaned them due to tempo lines but now they are mint.
What am I missing here guys? Is my fuel pump bleeding fuel into carbs? No linkage is binding and keeping throttle blades open. Its definently not a lean issue because it has always had too much fuel on bottom end. Settings are factory closed on highs and 1.0 turns out on lows. Should I crank the lows in a 1/4 turn at a time? I tried that orignally before rebuilding carbs and it sorta worked but I was all the way down to 1/2 a turn out from closed on lows, and it still was too rich
I appreciate any and all thoughts on this.
Rob
I am having one last problem that I cannot resolve.
Issue:
It will not idle, way to rich on low end, if I let off throttle completely it will load up and engine will die. I tried raising idle today no avail. If I get out of the gas after a high speed run it loads up and bogs while I attempt to keep it running by feathering throttle on low end. It does and always has run great on top end. Busted out 55 mph last weekend. If I let it sit at dock for a moment or engine is off for a period of time longer than 10-30 seconds it is very hard to restart. I have to shut off fuel valve and continue to crank with throttle wide open to get some air into engine and try and keep it from fuel hydro locking. Its almost as if carbs are just still dribbling fuel into engine at low end, idle, and when engine is off.
History on ski:
Friend owned it wasn't using it and had upgraded to newer sea doos. I got the jet ski this summer to tinker with as a project. PO only complaint was it was very hard to restart after shutting it off and letting it sit. I diagnosed that and found that the fuel tank 1 way check valve near rub rail port side was stuck closed not allowing psi out of tank thus when hot outside the tank was pressurizing and forcing fuel into carbs causing a flooding of engine when off. Upper 1 way check valve beneath hood near hood latch striker was working fine but I still removed and verified it was allowing air into tank and not out as designed. In 2012 carbs were rebuilt, ign. coil was replaced, along with some other odds and ends that the PO mechanic did on it.
Things I have done since ownership:
Ski ran great first time out after replacing fuel tank 1 way vent valve. Every ride after that it had huge bogging problem. Changed all fuel and vent lines from old gray crap tempo lines to new automotive 1/4" hose and new clamps. Still had bogging after that. Finally found out that it was the rectifier. So no more bogging and ski has run perfect on top end since. Trimmed spark plug wires back, replaced plugs multiple times and gapped them correctly. Ski continues to foul out plugs and after replacing them it runs good for a bit but eventually they are fouled again from fuel soaked hard starts. Cleaned fuel arrestor with carb cleaner. Cleaned inner carb filters multiple times. Compression test passes at 148 and 147 psi.
Rebuilt carbs and replaced needles and seats. I did make sure that needle and seats lever arm wasnt raised above carb body by using a razor blade and making sure it was all flush per OEM specs so that the diaphram wasn't pushing on it keeping needle open while off. I put the 1.5 oem mikuni with viton needle and seats in carbs. Used all oem mikuni kit for rebuild from OSD. It ran great about 3 times after the carbs were rebuilt, I finally had a use for the choke haha when cold I used it and ski started right up! That was a huge relief. It started ok... to... better than before and I could definently let it idle all day, plus after WOT runs I could totally let off throttle and it would come down and idle without me trying to keep it running like before. I thought everything was kosher until today. Went riding with suke and idoseadoo and it started all over again. Extremenly hard starts, flooding when engine is off, but it ran really great on the top end. Pop off psi is 32 and 35 so that is within spec. PSI test carbs with pop off tester and they held psi great, and during rebuild really didn't look all that bad. Filters were definently dirty when I first cleaned them due to tempo lines but now they are mint.
What am I missing here guys? Is my fuel pump bleeding fuel into carbs? No linkage is binding and keeping throttle blades open. Its definently not a lean issue because it has always had too much fuel on bottom end. Settings are factory closed on highs and 1.0 turns out on lows. Should I crank the lows in a 1/4 turn at a time? I tried that orignally before rebuilding carbs and it sorta worked but I was all the way down to 1/2 a turn out from closed on lows, and it still was too rich
I appreciate any and all thoughts on this.
Rob
Bolted it on ski. Loaded ski on trailer and headed out to boat ramp. 
