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Discussion Starter #1
I just bought this ski (as a newbie) a month ago. The carbs were gunked with old gas. Had a jet ski mechanic clean out all 3 carbs and replace a couple of carb parts. He also gave it a pre-season service. It performed great on the ocean for 1.5 hours- lot's of response and power. Brought it up to a 7000ft lake, and performance at lower RPM was poor, but certainly expected because of the altitude. Performance at 4500 RPM and higher was great for a couple of days, and then suddenly while out in the lake, the ski will bog down after 3000 RPM, and won't go above 15-20 MPH without wanting to die. I have a primer kit on the ski, and find that I was able to get it back to the dock by giving the carbs a shot of gas from the primer kit every few seconds while pulling the throttle, which I think restored the proper power of the ski. So I'm thinking there is still no problem with my carbs, but that there is some problem with the main gas supply. I also drained the 91 octane gas and ran it dry, replaced with new gas, but the problem still persists. Is there a fuel filter that could be clogged that I can easily find and clean out? Or could it be a fuel pump issue? I'm still on vacation with a full set of tools, but no manual or access to parts.

Thanks,
ben
 

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Discussion Starter #3
Adjust the carbs for what? Can you provide more detail or context? Are you suggesting that the dramatic change in the ability to get to higher RPMs and speed (power) from one moment to the next is simply due to a finicky ski's carb adjustment while at 7,000 feet? Remember I stated that the carbs were just worked on a couple of tanks of gas ago, and they did receive their adjustment at that time. The ski also performed beautifully at sea level.

If the answer is "yes," then I'd like to know if there is a reasonable adjustment procedure that one would do when going up in elevation. Can the carbs be reasonably adjusted by the owner at the higher elevation lake? Or do these adjustments need to be done in a tank environment where load performance needs to be tested on the fly as the adjustments are made? I guess what I'm getting at is, are these adjustments reasonably easy and straightforward to make while your on site at a lake?

Thanks,
ben
 

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BORN TO FISH NOT CATCH
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yes, higher altitude means less air
which you are running rich
for every 2500 feet one to jet sizes down

every 1 to 1-1/2 turn is 1 size lower, usually

you can adjust on the trailer

if you have no idea what I'm talking about, bring it to a professional tech

get idle first , then wot
 

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Discussion Starter #5
Thank you. I'm handy working on cars, and I've just gotten a repair manual for the ski, so I'm sure your advice will make sense when I read up on carb adjustments.

Thanks again.
ben
 
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