no midrange 95 SL750

[Speakrdude]

Well, did the first lake test today after fresh complete rebuild. Put the carbs at factory specs according to Seloc. Idle is OK, get it to 25~3000 RPM's, it will crap out unless you give it choke, then if you ever get it to full throttle, working the choke, it will scream. (don't wanna do that yet, new engine) Has new 780 fuel pump with 3 outlets. Is this a hi or low speed adjustment, fuel restriction?

Inquiring minds........

Jim

[Technical Support]

Re: no midrange 95 SL750

Where exactly do you have the needles set (I don't care what an inaccurate Seloc manual says) and have you used kits and rebuilt the carbs? Who rebuilt the motor? What caused the original failure and what was done to fix the cause?

[Speakrdude]

Re: no midrange 95 SL750

I purchased the engine from a shop that didnt want to invest the $$ to rebuild due to the age and resale value.

I rebuilt the engine as I have done many times before, (not this engine many times, but you get the idea.) Bad crank seal (PTO) took out lower case, crank, etc.

Replaced crank, case, jug, bored all , new pistons, seals..etc and so on... pressure test...good
Engine had the upgraded fuel pump setup with the lill-bity pump added but as a safety measure I replumbed with a pump for a 780. all new clear hoses, clamps.

Completely torn down, cleaned, inspected all three carbs. Looked as if they were rebuilt not too long ago. All rubber fine. tested pop-off in each. No leaks.

Carb settings (per Seloc) fwd.1-1/4, cnter 3/8, pto 7/8

By-the-way, does anyone know how to reset the hours on the digital clock?

[Technical Support]

Re: no midrange 95 SL750

Throw that manual away, it's useless.


Correct settings are:

High speed: mag 1 turn, center 1/2, pto 3/4
low speed: 1/2 all
pop-off 10-18psi

[Speakrdude]

Re: no midrange 95 SL750

So it does sound to you like a carb setting issue?

and.....all three large hose fittings on the lower port-side case are to be connected together and capped, correct? And then drained for winter of course.

Jim

[Technical Support]

Re: no midrange 95 SL750

That's fine for the fittings, and it certainly could be a carb issue, if you have them that over-rich. It only takes 1/8 to 1/4 turn to make dramatic differences.

[Speakrdude]

Re: no midrange 95 SL750

OK, I'm stumped. I have tried every adjustment there is but with about the same results. give it trottle and it will starve itelf to death. If you give it 25% choke, it runs like a new one. Realll crisp. Adjusting the lo speeds out to almost 2 or 3 turns seem to make it improve. So it all keeps coming back to the same result, lack of fuel. Also I removed the thermostat and restrictor and improved the flow of water tremendously. It was getting pretty warm. But that did not change the fuel issue.

A couple of stupid questions: On this model ski, is the fuel inlet the upper fitting or the lower fitting on the carb rail? I cant remember when I rebuilt. Can the low speed and the hi speed screws be in the reversed?
I also noticed that while at a fast idle, removing #3 plug wire doesnt seem to make any difference. Is that common due to 3 cylinders? Maybe only notice at higher RPM's? Or could my problem be #3 carb no getting fuel? I have clear, blue fuel hoses so I see fuel being pumped to all carbs. The fuel/water seperator filled real fast, good pressure. Return fuel trickling back into tank so that looks ok.

[beerdart]

Re: no midrange 95 SL750

Do you have the fuel return restrictor installed?

[Speakrdude]

Re: no midrange 95 SL750

I did not add one if thats what your asking. If it's factory it should still be there.

Jim

[beerdart]

Re: no midrange 95 SL750

It is installed in the fuel return hose aprox 1/4 inch from where the hose attaches to the carbs.Item #14

[Speakrdude]

Re: no midrange 95 SL750

I do not remember seeing that, but it acts like it is there because of the normal amount of dribbling at the fuel tank. Although, that would explain the fuel starvation prob.

Can you answer my question about the fuel inlet? Is it the top or bottom fitting? uThe top has a red dot beside it.

[beerdart]

Re: no midrange 95 SL750

The in is the bottom
http://server1.sbtontheweb.com/forum...ad.php?t=16233

[Speakrdude]

Re: no midrange 95 SL750

Good, I got that one right.

Jim

[beerdart]

Re: no midrange 95 SL750

Did you change the return fuel line to clear blue if so you probably forgot the restrictor from the old line. It is inserted into the fuel line aprox 1/4 inch in from the carp nipple.

[surveyguy]

Re: no midrange 95 SL750

waitaminute..... sounds to me like it's just cold anyway. You say you start it, it idles fine, and runs fine if you hit the choke for a second..... that's just a cold engine. What happenes after it warms up for a couple minutes?