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ASP 120 fs owners

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stuart macrory12/01/2009 22:04:00
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110 forum posts

hi,just bought an asp 120 fs and the instructions are the worst ive seen for a 4 stroke newbie like me.i can see the high speed needle but is the low speed needle the one that has a spring on the screw beside the fuel inlet nipple also there is a slot head grub screw in the centre of the throttle arm(what is this for??)

also when you push the throttle arm to the fully closed position there is still an opening in the carb of about 4mm

and 1 last one what is ment by twin needle on this engine

please help as i really want to get this engine going

many thanks 

Tim Mackey12/01/2009 22:53:00
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20920 forum posts
304 photos
15 articles

1) The little screw with the spring on is a throttle stop screw - virtually redundant really with TX servo travel EPA etc.

2) The "grub screw" in the centre line of the throttle barrel arm is the one you  need for low end adjustment

3) The small gap in the barrel when throttle arm is closed is because item 1 is screwed in too far.

4) twin needle because it has err, twin needles - one high speed and the one in item 2

stuart macrory12/01/2009 23:01:00
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110 forum posts

many thanks timbo

so the twin needle thing really applys to most if not all engines then

its just when i bought the engine it sort of promoted the fact that it was twin needle as if it was something special

stuart macrory12/01/2009 23:03:00
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110 forum posts
i dont suppose you know the factory settings for the 2 needles
Tim Mackey12/01/2009 23:05:00
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20920 forum posts
304 photos
15 articles

Some use an air bleed screw rather than a fuel flow needle to control the idle mixture - most though now use 2 needles... no big deal really.

ASP and SC engines ( both identical actually ) are jolly fine cheapy copies of the "Other Sort " IYSWIM

Tim Mackey12/01/2009 23:07:00
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20920 forum posts
304 photos
15 articles

I would leave the idle alone - it it coughs and splutters and hesitates on pick up its probably rich, so turn it in a tad.

My SCs always seemed happiest at about 1.25 - 1.5 turns out on the main - best to set em slightly rich IMO

Andy Gates13/01/2009 18:51:00
643 forum posts
20 photos

My 2 stroke SC needed some slow needle adjustment after it was run in, so I would run a few tanks throughit and see how it goes.

As with anything else, do small adjustments and only one adjustment at a time.

If the needle is wound in too far and the mixture gets too weak, the engine will spit and splutter and over hear. As Timbo says, err on the rich side.

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