TROUBLESHOOTING
4. Align crank gear(drive shaft) and cam gear(cam shaft): there are TWO
NOTS and ONE NOT in crank and cam gears respectively, you must align
them at this step;
5. Put case gasket and match two halves of engine together, tighten all bolts.
6. Put back push rods and rocker arm assembly, tighten two bolts for holding
rocker arm, adjustment screws and nuts on rocker arm assembly and make
sure adjustment screws touch push rods slightly so that you can lift up and
down push rods. DO NOT TIGHTEN ADJUSTMENT SCREWS FIRMLY AT
THIS POINT, OTHERWISE, YOU CAN'T ADJUST VALVE GAP.
B. How to set valve gaps:
The 4 strokes for engine are:
Intake spray fuel, compress explode outtake exhaust.
When you spin flywheel, you can see push rods and rocker arms moving back
and forth to make intake and exhaust valves open and / or close:
When both push rods move to their lowest positions, both intake and exhaust
valves are close, then you can use your hand to move both rocker arms a little
(both valves are close at this position);
This position is very important, you need adjust the valve gaps at this point; the
gap between rocker arm and valve clip (a small round platform) for both
sides(intake and exhaust valves) is 0.15-0.20mm (about 0.005906-0.007874
in). You can use a filler ruler of 0.15-0.20mm thickness to adjust.
C. Install fuel injector first, then install fuel pump.
You must install fuel pump correctly, otherwise you either can't start engine or
overspeed engine. Below are brief procedures for reinstallment:
1. When you reinstall fuel pump, pull its needle half way in OBSERVATION
WINDOW (bottom opening in fuel pump), push speed handle(fuel throttle lever)
halfway. You can see a HOOD of speed handle when you move speed handle
from left to right. The HOOD is used to hold fuel pump needle so that you can
simultaneously move needle while push speed handle from left to right.
2. Use one hand to replace fuel pump while use the other hand to hold speed
handle half way, let fuel pump needle right sit in the HOOD of speed handle,
tighten upper two nuts first then move fuel lever and see whether the needle
moves with fuel throttle lever, otherwise, you need reinstall the fuel pump
again.
IMPORTANT NOTES:
When you need use a hammer during disassembling or reassembling process
whenever necessary, please NEVER USE METAL HAMMER to hit any parts,
otherwise, you will deform or damage them.
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