Rotax 503 question.

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deskpilot

Well-Known Member
Joined
Jun 30, 2009
Messages
1,121
Location
Morphett Vale, South Australia. Just south of Adel
I have an early 503 on my thruster but as yet, have not connected the tacho. Why, because there is no grey wire coming out of the engine. All diagrams say this wire is for the tacho. My question therefore is, how else can I get the correct impulses to operate said tacho?

My home team RecreationalFlying.com.au couldn't provide me with an answer. Can anyone here help me?
 

n3puppy

Well-Known Member
Joined
Jun 25, 2019
Messages
107
When you say "Early" do you mean a 503 with points instead of CDI ignition?

If so - here is the wiring digram for a points motor tach

Also need the correct tach for a points motor
E9481989-6D22-47A7-8636-EFD0A6072CD0.jpeg
 

ToddK

Well-Known Member
HBA Supporter
Joined
Jan 13, 2016
Messages
296
Location
The Real Texas
I got one of those Hardline Tachs for my 582, its like a tiny tach only better. 1 wire, no ground, and you can substitute the Hardline wire with normal 18 guage awg up to 15 feet. This came in handy on my Chinook (which is a pusher). It reads right on with my MGL tach that is connected to the gray wire.
 
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