Honda CRF250R 2005, Owner'S Manual

Page: 87 / 164

Servicing Your Honda
83
Drive Chain
Refer to Safety Precautions on page 19.
The service life of the chain depends on proper
lubrication and adjustment. Poor maintenance
can cause premature wear or damage to the drive
chain or sprockets.
When the motorcycle is ridden on unusually
dusty or muddy tracks, more frequent
maintenance will be necessary.
Before servicing your drive chain, turn the
engine OFF, raise the rear wheel off the ground
by placing the optional workstand or equivalent
support under the engine and check that your
transmission is in neutral.
It is not necessary to remove or replace the drive
chain to perform the recommended service in the
Maintenance Schedule.
Drive Chain Inspection
1. Turn the engine off, raise the rear wheel off
the ground by placing the optional workstand
or equivalent support under the engine and
shift the transmission into neutral.
2. Check slack (1) in the upper drive chain run
midway between the sprockets (2)(3). Drive
chain slack should allow the following
vertical movement by hand:
1 – 1 3/8 in (25 – 35 mm)
(1) drive chain slack (3) driven sprocket
(2) drive sprocket
3. Check drive chain slack at several points
along the chain. The slack should remain
constant. If it isn’t, some links may be kinked
and binding. Lubricating the chain will often
eliminate binding and kinking.
Excessive chain slack may allow the drive chain
to damage the engine cases.
4. Inspect the drive chain for:
• damaged rollers
• loose pins
• dry or rusted links
• kinked or binding links
• excessive wear
Replace the drive chain (page 85) if it has
damaged rollers, loose pins, or kinks that cannot
be freed. Lubricate the drive chain (page 84) if it
appears dry or shows signs of rust. Lubricate
any kinked or binding links and work them free.
Adjust chain slack if needed.
NOTICE
(4) chain slider
6. Check the chain guide slider (5) for wear.
Replace the chain guide slider if it is worn to
the bottom of the wear limit groove (6).
(5) chain guide slider
(6) wear limit groove
(cont’d)
(2)
(1)
(3)
(4)
(5)
(6)
5. Check the chain slider (4) for wear.
If the wear is 3/16 in (5 mm) or more, replace
it.