2-6
SPEC
Model name:
MZ400
MX400
Model code number:
7HSB
7HSJ
Valve spring:
mm (in)
Free length
IN
36.2 (1.4252)
EX
36.2 (1.4252)
<Limit>
IN
34.39 (1.3539)
EX
34.39 (1.3539)
Installed length
IN
29 (1.1417)
EX
29 (1.1417)
Installed compression spring force
IN
N (kgf, lbf)
91.20–104.93 (9.12–10.49, 20.50–23.59)
EX N (kgf, lbf)
91.20–104.93 (9.12–10.49, 20.50–23.59)
Tilt limit
mm (in)
1.7 (0.0669)
Carburetor:
mm (in)
Type/manufacture
RUIXNG
I.D. mark
7HP-E4301-**
Bore size
ø26
Main jet
1.23 (0.050)
1.27 (0.050)
Main air jet
1.4 (0.055)
Pilot air jet
1.2 (0.045)
Pilot outlet
1.0 (0.039)
Valve seat size
1.8 (0.070)
Pilot jet
0.54 (0.02)
0.55 (0.02)
Pilot screw
1 3/4 turns out
Throttle valve
13°
14°
Float height “H”
14.9 (0.59)
Governor arm:
Tension spring attach hole
3
1
Engine speed:
r/min
3700–3800
3750–3850
High engine speed
Low engine speed
1900–2100
1
2
3
4
5
6
7
8
9
MAINTENANCE SPECIFICATIONS
