
03-63
SECTION 03 - ENGINE PREPARATION
Basic Instructions
1. Use a new gasket between the carburetor(s)
and intake manifold.
2. Use flat washers and lock nuts to secure the
carburetor(s).
3. Be sure that the fuel lines are of the correct di-
ameter for the carb fittings. Secure all hose
connections with cable ties and proper clamps.
4. When installing the throttle cable, be sure to
securely tighten the jam nuts. Allow a small
amount of free play at the throttle lever. Check
to see if the throttle is opened as the handlebar
is turned from side to side; correct the cable
routing if necessary.
External Components
1.High speed screw
2.Fuel return
3.Fuel inlet
4.Pulse nipple
5.Outer venturi
6.Inner venturi
7.Fuel pump assembly
8.Idle stop screw
9.Low speed screw
10. Regulator diaphragm high and low speed jets needle valve
assembly
Internal Components
At first look the cutaway drawing (see next page)
appears somewhat straight forward, but some in-
teresting things appear as you study it. Follow the
fuel flow through the low speed circuit. Fuel flows
through the low speed jet and then is divided,
with part of the fuel being metered by the low
speed screw. An additional route the low speed
fuel takes is through the by-pass holes (transition
circuit). Fuel is drawn through the by-pass holes
as the throttle is opened and the butterfly valve
exposes them to the air flow. The ability for fuel
to pass through the low speed circuit and its tran-
sition is controlled first by pop-off pressure, then
by the size of the low speed jet.
NOTE:
If the low speed jet size is changed, it af-
fects the mixture both at idle speed and off idle.
-
CAUTION
Heavy duty carburetor cleaner may be
harmful to rubber parts, O-rings, etc. There-
fore, it is recommended to remove those
parts prior to cleaning.
-
CAUTION
Be careful at carburetor cleaning not to re-
move paint. Paint removal will cause carbu-
retor to corrode very rapidly. Repaint if
necessary.
F01D70A
4
3
2
1
10
9
8
7
6
5
Содержание Bombardier
Страница 1: ......