FINALLY got my SJ to start but no power!!!

S

spokewrench

X-
I bet it is the internal (fuel pump side ) filter. My ski would run fine for about 20mins then would start dieing out, like it was getting no gas and misfiring. Well, after spending $350- on new stator new coil and plugs. I had missed cleaning the small internal filter (which was 95% clogged) and when the underhood temperature would heat up the fuel, it caused the material in the filter to expand and restrict the fuel to the point that none would go through.

Hope this helps someone -
 
severinsen

severinsen

X
When I cleaned my carb, I made sure the filter was clear.

I talked to the guy who sold me the engine. He said that I should get some fogging oil and som Ring Free because when an engine sits for a long period of time, it can stick a little and lower the compression. He also said that a stock 61X should only be reading 130-135 so a psi of 120 should not be causing the problem I'm having of hardly no RPMs in the water, but high RPMs on a waterhose. What do you think of all this he is telling me? Trying to cover his as*?

Mouthfulloflake

I will be there Friday (-; I don't have any body other than a couple of shops that would charge me $100+ just to diagnose it. I may have to end up doing that.

I guess I'm going to do the fogging oil and the Ring Free thing just in case. Don't know much about it, but I cant see that being the problem.
 
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norcal ex

norcal ex

X-H2
Location
San Jose, CA
switch out the carb, it is a carb problem. 99% sure. also a stock SJ from the factory reads 150 PSI, he is full of it! are you running a stock head? the guage has to have the right length of thread thatthe spark plug would have if you want an accurate reading
 
severinsen

severinsen

X
I am running a stock head. I didn't know that about the threads. I will compare the guage threads with the spark plugs! I figured he was full of it. What do you think about his recommendations? Do you think a complete carb rebuild with a change in jets and needle and seat would be as good as buying a new carb? It would be MUCH cheaper. Thanks for the info!
 
norcal ex

norcal ex

X-H2
Location
San Jose, CA
how much is a carb worth to you, i have one sitting on a shelf that i know works. (im pretty sure i still have it, it came off my old wetjet engine.) also, when i have problems like this i like to switch the complete unit out. that way if it still doesnt work you know it is something else, which for your sake i hope it is not.
 
severinsen

severinsen

X
So I retested the compression (without using the fogging oil and Ring Free). However, I didnt use the adapter I used last time since the threads were longer than the spark plugs. This time I hooked it up directly, but the threads were now a little shorter the the spark plug's. I was getting a reading of roughly 130 for front and back.
 
G

gimmick

sports a beater 550
Location
Pensacola
I talked with him late Nov. He installed your carb but was still having the same problem. I just gave him a call to see how he was progressing/to give a hand but no answer.
 
severinsen

severinsen

X
Well....I finally got it running. Took the manifold off and noticed oil caked on the gasket. I repaired cause I figured it was leaking and running too lean. I took it to the water today and it ran a little better. Me and a guy from this forum played with the needles and got it running almost perfect.....just really sluggish low end punch. I have a couple of questions.....

Question 1

To get it to run great (other than the lack of a great low end), we screwed the high AND low all the way in. This is the only way it would run right. Why would only a very lean setting work?

Question 2

Why, after we got it running nice, would there be sluggish low end? I was thinking cause the low needle was all the way in, but thats the only way it would run in the water (outside of the water I would get full RPMs with normal high/low settings).
The fuel I had in there was about 8 months old....don't know if that would have anything to do with it.

Question 3

Here is a whole new problem. I emptied the rest of the little fuel that was left and put fresh fuel in it (used synthetic oil for the mix this time). I did this before I flushed the engine to get the salt water out. At first, the ski would not start so I poured fuel down the carb to prime it. After a couple of tries, it finally started. After starting, the enging was sounding a little erratic for a certain throttle setting. The flame arrestor was off and I looked in the carb. Fuel was spirting erratically.....I would rev it up and fuel would not be coming out, then all of a sudden it would. At high RPMs, the fuel would come out in a spray that went upward (like a mist). Isn't the fuel supposed to be a steady dribble in the carb? Also, a couple of times a flame would ignite....one time when I revved it up all the way, a huge flame burst came out of the carb! Is this igniting normal at high RPM settings? Could the reason for the erratic spilling of fuel into the carb be because the needles are close to being closed? I didnt want to open up the high and low to see if that would allow more fuel to dump until I found out about the flame. Thanks alot guys!

I'm almost there!!



~Jim
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
Question 1: You need to install a smaller main jet (and bring the adjuster back out to 1-1/2)

Question 2: You need to install a smaller pilot jet (and bring the adjuster back out to 1-1/2)

Questoin 3: It is possible that your popoff is too high, but take care of Q1 & Q2 first and see how it runs.


For more specifics, please read this

It should answer most of your carb questions and it gives you a procedure to actually tune that carb right.
 
xxx2

xxx2

Reply hazy, try again.
Location
panama city beach fl
:bigeyes: Hey I must have skimmed right over this Thread in the past! I am just East of you in panama city beach. If you can get your ski over here I am sure we can get this thing running correctly:Banane01: I have a decent assortment of mikuni sbn parts, and Maybe a rebuildable carb? If nothing else "Royal Flush" on this Site lives over here also....:sneaky: I know he has enough parts in his shop to build 2 badass SJ's:sneaky:
 
Idok

Idok

F1pro
Location
Nations oldest muthaF+++kin city
your compression sounds fine....its doesnt matter if its 120 or 130, so long as SYMMETRICAL!

sounds like a bad n/s to me........i'd just try to pick up a spareused carb rather than messing with what yoiu have...

get it running, then backtrack and rebuild the old carb later...


i bet zig has some brand new or like new ready to sell....
 
severinsen

severinsen

X
Mouthfulloflake

It is the carb you sent me. Rejetted it with a main of 135, pilot of 120, needle and seat of 2.3, and pop-off of 65 grams. It's not dribbling steady...fuel comes out in bursts. I'm guessing it's not coming out steady because the high and low needles are almost all the way in.

Matt E

Going to order one size down to see if that helps. Thanks
 
Mouthfulloflake

Mouthfulloflake

ISJWTA member #2
Location
NW Arkansas
is that you that has been trying to call me?

wife said I someone call about a jetski somethng or other, I havent been home much lately busy at work.



severinsen said:
Mouthfulloflake

It is the carb you sent me. Rejetted it with a main of 135, pilot of 120, needle and seat of 2.3, and pop-off of 65 grams. It's not dribbling steady...fuel comes out in bursts. I'm guessing it's not coming out steady because the high and low needles are almost all the way in.

Matt E

Going to order one size down to see if that helps. Thanks
Click to expand...
 
Oktavius

Oktavius

XXX
Location
Pensacola, FL
Hi guys. I am a friend of Jim's and I have been trying to keep up to date on his SJ ventures. One thing he hasn't said was that another guy checked the compression and the other guy's gauge indicated a higher compression (can't remember exactly what it was) than the 130 that his gauge was reading. That is good, but what I was noticing was there seemed to be a pulse coming out of the carb when the guy was turning it over for the compression check (no filter or cover was on the carb. I am new to 2 strokes but wouldnt this be an indication of a bad reed or something? Could this pulse be causing the carb feed issues?

Oh, and he has smaller jets on the way.
 
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severinsen

severinsen

X
So......Replaced the jets with a smaller size (main130, pilot115), and no luck. In fact, things got worse. Adjusted the jets where they should be and the same thing happened. Pulled her in and leaned it out to about a half a turn out for each and it stared and boggled down quick. tried to start again and no luck. I pulled the hood off and there was about 2 inches of fuel sitting in my carb!!!! Ran to my car and grabbed paper napkins but about an inch and a half already fell thro my plate at that point. i dont want to try to start it again knowing there is alot of fuel down there. This is killing me!!
 
Mouthfulloflake

Mouthfulloflake

ISJWTA member #2
Location
NW Arkansas
so,

when its running, do you see fuel dribbling down the carb throat?

when you gas it, do you see a mist come out? or drops?
 
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