Super Jet Needle "not seating"?

[FlightPlanDan]

This is not a big deal at the moment. I'm kinda looking for confirmation.

The ski is running good. But lately when I fire it up, after it sits for a day or two, it revs up significantly for 30 seconds or so. Then will idle normally. (as if there was plenty of fuel in there prior to starting)

I'm guessing that one of the needles is not seating properly. And, because I store it outside, the pressure builds through the day from the sun.

What else could it be?

Thanx,
Dan

 

[junkyardj]

i would think lean condition till the whole fuel system is full of fuel

have you tried using the primer to see if the revs come down?

 

[FlightPlanDan]

i would think lean condition till the whole fuel system is full of fuel

have you tried using the primer to see if the revs come down?

I've not tried that, nor did I think of a lean condition...
I've not used my primer in quite a long time. I thought it was because I always fire the ski's up every couple days, whether I'm gonna ride or not.

I'm gonna try it right now.....be right back.

 

[junkyardj]

almost every sj ive ever had that wasnt setup like the stock plumbing rev's up like that unless i prime it at start up

i hate the sound of a ski reving like that so i always bring it down with the primer or choke

 

[Dustin Mustangs]

Mine acts the same way when cold and on the trailer and the carbs are in perfect working order and tuned just about perfect. I use the primer to control the rpm until it is warmed up enough to have a reasonable idle on its own. If you don't want to deal with this just richen up your ls screw 1/8 turn at a time until it goes away.

 

[FlightPlanDan]

Just tried priming b4 starting. No difference. However, my primer might be bad. Didn't feel right. It's set up to pump fuel into the carb from the return line. If it's bad, and tank pressure is pushing back thru it........


As far as "all sj's" my second ski is set up the same way, but the primer sux fuel from the main feed line into the carbs.

It's too dark to try anything else tonight. But all input is appreciated!

 

[FlightPlanDan]

Having the primer suck from the return line works well in a "riding" situation. When you've been able to load the fuel lines on the trailer. From a "dry start" it may have some issues. Not really sure.

Gonna take the primer "out of the loop" after work tommorrow.

 

[FlightPlanDan]

I feel a bit stupid.

The suction/discharge lines to/from the primer were reversed.
I guess the rev was caused by tank pressure pushing back thru the return line, thru the primer and into the carbs. Maybe just vapors, but enough to give symptoms.

Glad I didn't yank the carbs!

 

[Sanoman]

Don't be so hard on yourself! Seems like a lot of times we overlook the obvious.Human nature.Always looking for something worse......

 

[FlightPlanDan]

Less work is better, no matter how stupid I feel!

 

[SUPERTUNE]

This is not a big deal at the moment. I'm kinda looking for confirmation.

The ski is running good. But lately when I fire it up, after it sits for a day or two, it revs up significantly for 30 seconds or so. Then will idle normally. (as if there was plenty of fuel in there prior to starting)

I'm guessing that one of the needles is not seating properly. And, because I store it outside, the pressure builds through the day from the sun.

What else could it be?

Thanx,
Dan

Perfectly fine, all our skis are that way, we do tend to run up our idle screws for a faster than normal hot idle, so when we start them cold they're just a bit lean, as long as you keep one finger on the stop button and one on the throttle in case you get a runaway engine...pin the throttle wide open and keep pressing the stop button as fast as you can and that will stop a runaway engine, or like some say, if you don't have dual exhaust, plug up the exhaust outlet with your foot and smother it out.

 

[FlightPlanDan]

Perfectly fine, all our skis are that way, we do tend to run up our idle screws for a faster than normal hot idle, so when we start them cold they're just a bit lean, as long as you keep one finger on the stop button and one on the throttle in case you get a runaway engine...pin the throttle wide open and keep pressing the stop button as fast as you can and that will stop a runaway engine, or like some say, if you don't have dual exhaust, plug up the exhaust outlet with your foot and smother it out.

Thanx Chuck!
I would be an even bigger idiot than I already am if I didn't listen to you!
The thing is acting perfectly....(well...as good as ever)..now that the primer lines are in the right position! LOL

But, I would smell gas when I pulled the engine cover off...and this issue started after I last pulled the e-box. (had to pull the primer lines for that)

I just put them back wrong. Lean gas vapor at start-up. Make sense?

P.S: it never really "ran away". Just kinda rev'd high.

 

[FlightPlanDan]

I could be wrong, but I don't think this could have happened if the primer was sucking off of the main fuel line instead of the return line.
However, the ski might not have been "ride-worthy" the other way around. And I had some good riding while this was going on.
I'll keep the primer suction on the return line.......I'll just make sure that I put the primer lines on properly!

 

[FlightPlanDan]

Perfectly fine, all our skis are that way, we do tend to run up our idle screws for a faster than normal hot idle, so when we start them cold they're just a bit lean, as long as you keep one finger on the stop button and one on the throttle in case you get a runaway engine...pin the throttle wide open and keep pressing the stop button as fast as you can and that will stop a runaway engine, or like some say, if you don't have dual exhaust, plug up the exhaust outlet with your foot and smother it out.

Well, I guess you're right (as per usual! lol)
I thought I had it figured out.....Now it's doing it again. With the primer lines in the proper position, a few pumps calms it right down.

I've had this ski for 7 years. Just started doing this. But as long as it won't hurt anything, I'll give a few pumps and not sweat it!
Thanx all.

 

[orangefinger]

i would recommend to run the primer off reserve line if you are still using the fuel switch and single line( flipp switch to reserve, prime, flipp switcg back to on start, if you run no fuel switch and each carb one line run primer of returnline, route the return line with a little U and you always have enough to start, for a good dialed in ski this should be enough to start anyway.

I would not run the primer of any feed line due to the fact that most primers will allow for air and one of your carbs will be running lean or suck to much air via primer line !!!

I always prime the ski when shutting it down for the day this also ensures enough fuel in return-primer line

 

[FlightPlanDan]

i would recommend to run the primer off reserve line if you are still using the fuel switch and single line( flipp switch to reserve, prime, flipp switcg back to on start, if you run no fuel switch and each carb one line run primer of returnline, route the return line with a little U and you always have enough to start, for a good dialed in ski this should be enough to start anyway.

I would not run the primer of any feed line due to the fact that most primers will allow for air and one of your carbs will be running lean or suck to much air via primer line !!!

I always prime the ski when shutting it down for the day this also ensures enough fuel in return-primer line

I've removed the on/off/res switch. I run completely off of the reserve line.
Otherwise, it's a stock set up.
However, a reputable mechanic told me that the primer suction should come from the return line instead of the feed line (I had air leaks at the time which he repaired)
This works just fine. My fuel lines don't seem to "empty out". If the lines were empty, then the primer on the return might not work.
This has happened a time or two. But only if I don't run it for a few weeks . Even in that case, I have no trouble starting.
Maybe a little extended cranking.