Carb jetting for a 503?

Carb jetting for a 503?

Post by Torbj?rn Josefsso » Wed, 19 Jul 2000 04:00:00


Hi!

I'm not at all into snowmobiles so forgive my ignorance, but I need some
info that you guys might be able to help me with!

I'm changing carburetors on a Rotax 503 from Bing to Mikuni 34 mm (in an
ultralight).

Can anyone here please inform me of what standard jetting, let's say a
Ski-Do with a Rotax 503 (52 hp) - dual carburetors (34 mm), comes with as
standard if I buy a new one?

This is what I need to know:

Slides: ?
Main jets: ?
Needle jets: ?
Jet needles: ?
Pilot jets: ?

For what altitude and temps are the standard jetting calculated for?
Does it differs from country to country, or even between certain local
places?

I have EGT's and I are prepared to rejet, but I need a reference point to
start out with.

Many thanks in advance.
/ Tobe

 
 
 

Carb jetting for a 503?

Post by Jim Williams » Wed, 19 Jul 2000 04:00:00

Did you try rec.aviation.ultralight?  Good group there.

I have a Mikuni 34 on a 440 Kawasaki - single carb.  If you want me to
toss setup numbers I can but the setup is, I feel, too different.

Quote:

>Hi!

>I'm not at all into snowmobiles so forgive my ignorance, but I need some
>info that you guys might be able to help me with!

>I'm changing carburetors on a Rotax 503 from Bing to Mikuni 34 mm (in an
>ultralight).

>Can anyone here please inform me of what standard jetting, let's say a
>Ski-Do with a Rotax 503 (52 hp) - dual carburetors (34 mm), comes with as
>standard if I buy a new one?

>This is what I need to know:

>Slides: ?
>Main jets: ?
>Needle jets: ?
>Jet needles: ?
>Pilot jets: ?

>For what altitude and temps are the standard jetting calculated for?
>Does it differs from country to country, or even between certain local
>places?

>I have EGT's and I are prepared to rejet, but I need a reference point to
>start out with.

>Many thanks in advance.
>/ Tobe