Nirvana TOP 80, Assembly And Maintenance Manual, Page: 5 / 23

5
last update 23.10.2012
SYMPTOMS OF A RICH OR A LEAN FUEL MIXTURE – ADJUSTMENT SCREWS
“L” screw set
to
lean:
(screwed in to
far)
It may idle well BUT will not accelerate. Acceleration causes the
engine to die.
“H” screw to
rich: (screwed
outto far) If left to idle for 2 – 3 minutes – engine “loads up” with
excessively “wet” (rich) mixture and dies. Fuel pools at the
bottom of the engine cases, when accelerating the enginein this
state – you will get a rumbling sound and excessive smoke as
engine attempts to clear pooled fuel.
VALBRO
The Valbro carburettor used has a cold start function (choke) for cold
climate, and initial start procedure.
Lever ‘A” in position 2 for starting, in position 1 for normal operation.