fuel line restrictor

[Guest]

Any one know where I can get a return line fuel restrictor, or what I can use for one? My 1993 750 polaris has new fuel lines from previous owner but the restrictor is nowhere to be found.

[Guest]

does this work?

CrazyA says "
Simple Return Line Restrictor
This is probably the easiest and best way to make one, or redo one that gets thrown out by accident on the older models where they are in the fuel line.

1) 1/4" hose barb splicer (I like the brass, but it will work on all three of these examples)

2) 5 X .75 Tap

3) Mikuni main jet of appropiate size" will this work?

The link is,

http://www.greenhulk.net/showthread.php?t=12649&highlight=polaris+fuel+line+restrictor+size&page=2

[Guest]

hmmm

Does the 1993 750 even have a fuel line restrictor?

[CrazyA]

New batch of restrictors

For those needing restrictors, I made some more of them and they're ready to go. I made them in 2 different versions.

Straight inline barb connector threaded for the Mikuni Super BN main jets, and a "tee" version for those who might want a permanent fuel pressure port, also pre-threaded for the Mikuni Super BN main jets. This version comes with a rubber push cap and ziptie.

Both versions come with 1 main jet of your choice, a #60 OR a #90.

I really only do this to help others who need one and might not want to hunt down the main jet tap. I'm not looking to make any profit, but believe it or not, I need to get about $15 each to cover them WITH shipping to your door in the lower 48.

[K447]

VERY nicely done

I like the way you did the Tee version - very slick

[casey67]

Very cool , I've spent more than that chasing parts/ tools.

[Guest]

Nice CrazyA

I can appreciate the work you did, but I don't think I need one. The 1993 750 SL starts fine and runs fine on land. I haven't had it in the water yet but the throttle response is crisp without a load on it. I read they help boost the carb pressure from 1-2 pounds to around 4 pounds and I don't know much about the settings so if I am wrong or they will help I will definitely get one of of you, can you advise?

[K447]

I can appreciate the work you did, but I don't think I need one.

The 1993 750 SL starts fine and runs fine on land.

I haven't had it in the water yet but the throttle response is crisp without a load on it.

I read they help boost the carb pressure from 1-2 pounds to around 4 pounds and I don't know much about the settings so if I am wrong or they will help I will definitely get one of of you, can you advise?

You MUST have a flow restrictor in the fuel return line. It is not optional.

If your carb doesn't have an internal restrictor (which the 1993 carbs didn't), then you must have one in the return fuel line.

Without the restrictor, as you apply throttle in the water and the engine works against the water load, the carbs will starve for fuel. The engine will run lean due to low fuel pressure, and you risk piston damage.

The engine will also run poorly, and will be impossible to tune properly.

Your carbs are designed to work properly with the correct fuel pressure provided by the restrictor. It is there for a reason.

[Guest]

ok so I need one

I was going by these two threads, so I wasn't sure at all. I figured there must be some difference between 1993 and 1994 carbs as the setting on the highs are so different from each year.

http://greenhulk.net/showthread.php?t=109651&highlight=1993+750+fuel+line+restrictor&page=2

http://greenhulk.net/showthread.php?t=32220&highlight=randy+restrictor

So thanks for the info could you send them to Canada USPS at what ever the extra cost is?

[FowlPlay]

I wan to make a fuel line restrictor, but I can't find the tap your talking about...5x.75...is that the correct size?

[K447]

I want to make a fuel line restrictor, but I can't find the tap your talking about...5x.75...is that the correct size?

That is the size Art listed in his thread.

I figured there must be some difference between 1993 and 1994 carbs as the setting on the highs are so different from each year.

I was going by these two threads, so I wasn't sure at all.

http://greenhulk.net/showthread.php?t=109651&highlight=1993+750+fuel+line+restrictor&page=2

http://greenhulk.net/showthread.php?t=32220&highlight=randy+restrictor

So thanks for the info could you send them to Canada USPS at what ever the extra cost is?

Polaris did change the carb jet and screw specs from year to year, especially in the first few years (1992-1995).

I don't have, and don't make, the restrictors. CrazyA does. I don't know if he has any available right now, but you can send him a PM and ask.

Another possible source for OEM restrictors is John Zigler. Contact info listed under Parts Sources in my signature links.

[Clayton G]

You MUST have a flow restrictor in the fuel return line. It is not optional.

If your carb doesn't have an internal restrictor (which the 1993 carbs didn't), then you must have one in the return fuel line.

Without the restrictor, as you apply throttle in the water and the engine works against the water load, the carbs will starve for fuel. The engine will run lean due to low fuel pressure, and you risk piston damage.

The engine will also run poorly, and will be impossible to tune properly.

Your carbs are designed to work properly with the correct fuel pressure provided by the restrictor. It is there for a reason.

Polaris parts listings show a restrictor for the 94 SL750 but not the 93. I replaced the fuel lines in my wifes 93 last year and there wasn't one in it and it runs great. We haven't had a problem with it.

[K447]

Polaris parts listings show a restrictor for the 94 SL750 but not the 93.

I replaced the fuel lines in my wife's 93 last year and there wasn't one in it and it runs great. We haven't had a problem with it.

I will defer to the Fuji engine experts on this.

I was under the impression that all the early year 650 and 750 engines had the return line restrictor

[xlint89]

The 92 and 93 don't show a restricor in the parts diagram, but a quick check of the fuel pressure should tell you if you NEED one.

Should be between 1-2 psi at idle and 4-6 psi at WOT

[mrjetskey]

werent the 92 and 93s the carbs that have the fuel rail and if so the restrictor is built into the return rail its pinhole size coming out of each carb outlet in the rail.The fuel and return line didnt have anything in them,hope this helpsOH the only reason you might need in a 93 is if the carbs have been modified by removing the rail and installing ind. backs>Marvin