Echo CS-310 Service Manual

ENGINE
CS-310
59
8-10 Installing piston and piston ring
1. Set piston pin spacers (A) on small end of con-
necting rod (B) as shown.
NOTE:
Place piston over connecting rod with pis-
ton arrow mark (C) pointing as shown.
2. Insert pin guide tool (D) stamped “8”, through
piston, with piston pin spacers set at step 1.
3. Insert piston pin in piston, pushing out pin guide
tool until the pin end comes up to snap ring groove
(E).
NOTE:
If piston pin is tight, use piston pin tool
897702-30131 with pusher adapter stamped “8”.
4. Install new snap rings on both end of piston pin.
Make sure that they are properly seated in snap
ring grooves.
NOTE:
Always use new snap rings.
5. Install piston ring on piston.
B
A
C
D
E

Echo CS-310 Specifications

General

Engine Displacement	30.5 cc
Bar Length	14 inches
Weight	8.8 lbs
Chain Pitch	3/8 inch
Chain Gauge	0.050 inch