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Could be a number of things. Simple things to try first are fuel filter (try bypassing it), same with res/on fuel switch, replace fuel, new spark plugs, new fuel lines, rebuild and clean carb,.... To test further for an exhaust leak, see if it does the same thing with the hood removed. If so...

Enjoy. Plan to spend some time in the water. If not, your not trying hard enough. [emoji12] Your first attempts at standing up will look like you are taking a dump. Try standing up straighter and not have a death grip on the handles. Initially having your feet separated with one foot more...

A couple thoughts for testing. Make sure engine is cold and see how easy it starts up. Might want to ask the owner to not start it before you arrive. You can touch the exhaust under the hood to assure it is not hotter than air temp before starting. Since you are a new rider, when taking off...

No way I would buy a ski from an unknown person without test riding and a compression test. I would suggest test riding them both and then make your choice. It might be obvious. Seems like both skis have been stored quite a bit. While that is nice since it is less chance they are beat, it also...

There is a nice write up at www.groupk.com/y633-781sj-all.htm that has pretty much all you would need to know, including differences between 61X, 62T, etc.

You would be fine on a Superjet. Given your size I would recommend to start with a 701 motor (not a 650). To start with an all stock machine would be ok. As you get more experience you could add performance enhancers like a girdled head, b-pipe, etc. The other thing to consider given your size...

Could be a variety of things. If you believe the carbs and fuel are not the issue, the simplest things to try to rule out are fuel filter (try bypassing), res/on fuel switch (try bypassing), fuel lines (replace), pulse line (unlikely, replace), fuel tank vent (make sure it is clear), replace...

Primer is T’ed into the reserve line (can see it in the picture. The primer line is yellow). The ON line was removed. The reserve line goes straight to the carbs. The return line goes back into the tank where the ON line normally is. I quickly tried removing the primer line at the T and covered...

Hmmm. Never thought of swapping the carbs from my other SJ. Simple enough to do, and should fully determine if carbs are the issue or not. Have not checked tank valve. Again easy enough to do. Thanks for the ideas

Makes sense. Thanks

Holy crap. These threads are great. Wish I knew they were there years ago. The motor rebuild thread is perfect step by step with pics. If I end up having to go this route, this will be just what I need. Much Thanks.

No problems with starting. When I pulled the spark plug from the good cylinder and only have a spark plug in the suspect cylinder it is hard to start. (Other way around is no problem). Have new spark plug wires & boots (JSS). Tried switching plug wires and problem does not change. New CDI as...

I have rebuilt the carbs (using Mikuni rebuild kits) and have taken them apart and cleaned for good measure. What is the thinking on this? That restricted (or too much) fuel or air could cause the cylinder to underperform??

Yah. Might be. Ugh. I can inspect, although I have no experience with motor rebuilds. Thanks.

With the replacement reeds/manifold it seems to run slightly better, but still not right. Still can run almost the same with the rear spark plug removed. It barely can start when the front spark plug is pulled (use a third plug in the hole, with the removed plug still in the boot and...

If you still have them, put the old spark plugs in and see what happens. If changing the plugs was the only thing you did to result in the starting problem...could be a loose boot/wire connection that was made worse by changing the plugs. Kind of unlikely though. Was there an issue that made you...

We will be playing this upcoming weekend (Labor Day weekend) at Chautauqua Lake. Ya’all practiced up and ready for a match?.. or at least a scrimmage?

I know it is a pain but you might want to continue swapping electrical parts (and wires if practical) with your other Superjet. See what makes the other one fail and/or what makes this one work. Not sure what year your other SJ is, just need to assure the components are compatible (suggest using...

I had a good fuse, that ended up needing a cleaning on the ends of the fuse and in the fuse holder (used steel wool). Sounds too simple, but worth a check.