'03 fantom engine 2 needles or 3 (if u got a fantom, plz help)?

[Banshee]

ok i have an '03 fr12 non pull start rear exhaust fantom. the carb is rotary (if all that matters). i have found the HSN, you can't miss that huge thing. i also found the idle screw. now i dont know which is the LSN. there are only two other possible screws on the engine and I'm not sure which one is it. i have heard there are engines with a middle speed needle that turn simultaneously with the LSN. but I'm not sure if the fantom has 3 needles.
maybe the third thing that i think is a needle is just a screw, i dont know. ill try to describe it as best i can. if you have a fantom you can probly help me alot easier.

one of the screws that could be the lsn is at the end of the carb. it is where the throttle arm thing is that opens and closes the carb. it could just be a screw that hold that together.
the next one is on the side of the carb. its towards the right on the opposite end from the HSN and kind of low. its just a screw by itself and looks kind of like the HSN but smaller. this is what i think is the LSN but I'm not sure.

i can't take pics sorry my camera sucks too much to take close ups. if you have a fantom like i know fasteddy and a few others do, please help me out.

 

[SkyMaxx]

The screw that is at the end of the carb where the throttle arm is...that is the LSN.

 

[Banshee]

ohhhh. thanks alot for telling me that before i started messing with needles.
can i ask you what the other screw is for? should i just never touch that one? you should know what I'm talking about.
thanks for the quick reply.

 

[SkyMaxx]

If the screw is on the carb itself, then it might be a MSN. BUT I just looked at the Fantom site. The images they show of the engine you have indicate that this is a two needle carb (LSN and HSN).

The third screw is black? and looks like it is part of the engine's crank case? That would be the screw that tightens down to hold the carb in place.

 

[Banshee]

no its not black, its gray just like the rest of them.
and I'm not sure what a crank case is. oh well i guess ill just leave it alone. its in a pretty hard to reach place anyway.

thanks for the quick help sky.

 

[SkyMaxx]

Does this grey screw go into an area that is "behind" the carb? Is it "screwed" into the black portion of the engine kind of "below" the carb? If you look opposite the head of this screw (on the other side of the engine) is there a small nut?

If the answer to any or all of these questions is yes, then you are looking at the screw that holds the carb in place.

If the answer is no to all of the questions above, then you might have a three needle carb.

Check the attached image. If the screw you have a question on is in the vicinity of the engine that I have circled, then it is the retaining screw mentioned above.

 

[Banshee]

no, i see that screw on the engine but thats not what I'm referring to. here is the same pic you sent me, i circled the screw I'm talking about in green. its on the carb itself. its kind of hard to see but maybe you will know what I'm talking about.

i hope its not a three needle...thats just gonna make it more complicated to tune isnt it.

edit- by the way did you get my PM

 

[SkyMaxx]

That screw is the idle set screw. It igoes down through the body of the carb and the tip of it goes into a groove on the barrel of the carb cylinder. This screw sets the opening that exists when the throttle is closed. If you take your air filter off and look into the opening of the carb, you should see a cylinder. When the throttle is WOT, you should see an opening into the engine. When the throttle is closed, you should still see an opening, but it should be about the thickness of a credit card.

 

[SkyMaxx]

Here's a better picture with both screws in the area you circled, labeled accordingly.

One of them is the idle set screw (it should be black in color, but it may be grey); it should be sticking out a fair amount and may be angled away fro the carb body. It should be screwed into the top portion of the carb body.

The other is a screw designed to hold the carb's barrel in place within the carb body. That screw is grey in color and screws in perpendicular to the face of the carb body and may be flush when tightened down.

And, no. I have not yet received your PM.

 

[Banshee]

oh boy now I'm really confused. alright, there are 4 screws on the carb. one is the HSN for sure, the other which goes through the throttle arm in the end is the LSN, so theres two left.

I'm gonna try to show you can exploded view of the carb and lable things. here goes. reply when you see it about how I'm doing...and which is the idle screw.

damnit its too big and it gets messed up when i resize. maybe i can send through email or aim.

edit- disregard what i just wrote. thats the same pic i was gonna send you. that clears everything up. so i dont touch the carb barrel screw at all. just the other 3 when I'm tuning.

thanks a lot sky. you were a big help! ill try to send the pm again.

 

[SkyMaxx]

No problem. Sorry it was so confusing. Had to dig the exploded view out to make sure we were talking about the same thing.