Big Fish
Member
Hi All,
I've posted in the past about this issue and taken some steps but I'm still having issues so looking for some advice. I have a 2000 GTX with the 951 engine, duel Mikuni carbs and an accelerator pump. The compression is good in the ski and it runs very strong with a few very specific issues.
Scenario:
First, if I'm going fast (3/4 or above throttle) then let off the gas completely the ski stalls quickly but can start right back up. If I feather the throttle I can sometimes get it to not stall but its tough. Second, not always but if you punch the gas from idle it will bog down and stall most times unless you feather the throttle to get it going. Third, if you hang right around 3500 RPMs you can almost pinpoint that spot as to where it has some hesitation. Meaning if you go a little below or above that mark you can feel it hesitate. Finally, if you snap the choke before hitting the gas in scenarios 1 & 2 above the ski will take off without hesitation. This condition has existed for the 3 years I've had the ski.
Here is what I've done in this order:
1. Last year (2018) replaced the MPEM last year due to some other no start condition. Likely not related to my hesitation issue.
2. Last year (2018) replace rear ignition box, ignition coils and wires due to a gasket leak in that box. Likely not related to the hesitation issue.
4. This year (May 2019) took off air filter cover and while ski was not running held a mirror in front of carbs and hit the throttle a few times and saw spray going into both carbs. I'm told that is the test to see if my accelerator pump is working so I assume it was so I didn't replace the baffle (or whatever is inside the pump).
5. This year (May 2019) rebuilt carbs including new needles and seats and Mikuni OEM rebuild kit. Tried spraying carb cleaner in the small holes (that I assume were low speed holes) but I don't recall if I had no flow before and flow afterward. As I recall it was tough to see if me spraying them had any impact at all since they were so small.
I was hopeful the carb rebuild and clean would solve the hesitation and stalling problem but it is exactly the same after the re-build so I'm now at a loss. I assume it has something to do with the low speed jet since the ski hauls above 1/2 throttle with no issues. Also since if I hit the choke quickly and it responds I assume the problem is that I have a lean condition that becomes richer instantly when I snap the choke cutting off the air and increasing the ratio of gas to air.
Not sure what steps to do next so looking for advice. Am I now in a place where I can make some adjustments to the low speed jet and if so does that require I pull the carbs back off? Let me know your thoughts. Really appreciate your assistance.
I've posted in the past about this issue and taken some steps but I'm still having issues so looking for some advice. I have a 2000 GTX with the 951 engine, duel Mikuni carbs and an accelerator pump. The compression is good in the ski and it runs very strong with a few very specific issues.
Scenario:
First, if I'm going fast (3/4 or above throttle) then let off the gas completely the ski stalls quickly but can start right back up. If I feather the throttle I can sometimes get it to not stall but its tough. Second, not always but if you punch the gas from idle it will bog down and stall most times unless you feather the throttle to get it going. Third, if you hang right around 3500 RPMs you can almost pinpoint that spot as to where it has some hesitation. Meaning if you go a little below or above that mark you can feel it hesitate. Finally, if you snap the choke before hitting the gas in scenarios 1 & 2 above the ski will take off without hesitation. This condition has existed for the 3 years I've had the ski.
Here is what I've done in this order:
1. Last year (2018) replaced the MPEM last year due to some other no start condition. Likely not related to my hesitation issue.
2. Last year (2018) replace rear ignition box, ignition coils and wires due to a gasket leak in that box. Likely not related to the hesitation issue.
4. This year (May 2019) took off air filter cover and while ski was not running held a mirror in front of carbs and hit the throttle a few times and saw spray going into both carbs. I'm told that is the test to see if my accelerator pump is working so I assume it was so I didn't replace the baffle (or whatever is inside the pump).
5. This year (May 2019) rebuilt carbs including new needles and seats and Mikuni OEM rebuild kit. Tried spraying carb cleaner in the small holes (that I assume were low speed holes) but I don't recall if I had no flow before and flow afterward. As I recall it was tough to see if me spraying them had any impact at all since they were so small.
I was hopeful the carb rebuild and clean would solve the hesitation and stalling problem but it is exactly the same after the re-build so I'm now at a loss. I assume it has something to do with the low speed jet since the ski hauls above 1/2 throttle with no issues. Also since if I hit the choke quickly and it responds I assume the problem is that I have a lean condition that becomes richer instantly when I snap the choke cutting off the air and increasing the ratio of gas to air.
Not sure what steps to do next so looking for advice. Am I now in a place where I can make some adjustments to the low speed jet and if so does that require I pull the carbs back off? Let me know your thoughts. Really appreciate your assistance.