ROTAX
185cc (Lazair Ultralight Usage) CARBURETOR PROBLEMS
(1) Low Speed Problem -Possible crack in carburetor housing low speed
passage due to idle mixture needle being forced against the seat.
The taper on the low speed mixture needle is very slight,
therefore it is very easy to crack the housing if the needle is forced into the seat
passage with excessive force.
When removing the welch
plug covering the low speed circuit DON'T use a drill to drill
the removal hole, you could go through and damage the casting.
Use a
PIN Vice.
(2)
Choke Over center Pin -falling through into the airhorn area
and going through the engine.
Correction Procedure
-
Take an ice pick or something sharp and try to push the pin through the casting and into the
air horn. If its tight
0 worry.If its loose remove and peen over the outer end
slightly add a little epoxy and
re-install.
Loctite Loc- weld Part
# 14600 is
Push end
of pin what we use. We have 5 cases of this
direction shown if problem to date and considerable loose see text.
damage
occurred each time.
(3) Decompression
Valve-If the valve has a green plastic covering the outer end remove the
end (side cutters work well), check pin and metal end to see if they are
secure.
If the metal end and the pin are loose peen slightly and epoxy
,(We again use the Loc-tite Loc-weld). Its a good idea to epoxy it anyway
even if its not loose. If the pin does come loose it most likely will
take a chunk out of the piston. Later type valves have been checked at
the factory for looseness but have not been epoxied.
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