Introduction; Every 300 Miles (500 Km) - Yamaha TDM850 User Manual

1.8 Introduction

1 This Chapter is designed to help the home
mechanic maintain his/her motorcycle for safety,
economy, long life and peak performance.
2 Deciding where to start or plug into the routine
maintenance schedule depends on several
factors. If the warranty period on your motorcycle
has just expired, and if it has been maintained
according to the warranty standards, you may
want to pick up routine maintenance as it
coincides with the next mileage or calendar
interval. If you have owned the machine for some
time but have

Every 300 miles (500 km)

1 Drive chain and sprockets - 1|>
check, adjustment and
lubrication
Check
1 A neglected drive chain won't last long and
can quickly damage the sprockets. Routine chain
adjustment and lubrication isn't difficult and will
ensure maximum chain and sprocket life.
2 To check the chain, place the bike on its
sidestand and shift the transmission into neutral.
3 Push up on the bottom run of the chain and
measure the slack midway between the two
sprockets, then compare your measurement
1.3 Push up on the chain and measure the
slack
1.9 On TDM models, slacken the bolt
(arrowed)
never performed any maintenance on it, then you
may want to start at the nearest interval and
include some additional procedures to ensure
that nothing important is overlooked. If you have
just had a major engine overhaul, then you may
want to start the maintenance routine from the
beginning. If you have a used machine and have
no knowledge of its history or maintenance
record, you may desire to combine all the checks
into one large service initially and then settle into
the maintenance schedule prescribed. 3 Before
beginning any maintenance or
to that listed in this Chapter's Specifications (see
illustration). As the chain stretches with wear,
&>
adjustment will periodically be necessary (see
^
below). Since the chain will rarely wear evenly,
roll the bike forwards so that another section of
chain can be checked; do this several times to
check the entire length of chain and position the
tightest spot midway between the sprockets on
the bottom run of the chain.
4 In some cases where lubrication has been
neglected, corrosion and galling may cause the
links to bind and kink, which effectively shortens
the chain's length. Such links should be
thoroughly cleaned and worked free. If the chain
is tight between the sprockets, rusty or kinked,
it's time to renew it. If you find a tight area, mark
it with felt pen or paint, and repeat
DIRECTION OF ROTATION
ENGINE SPROCKET
WORN TOOTH
1.7 Check the sprockets in the areas
indicated to see if they are worn
excessively
1.10a Rear axle nut (arrowed) -
TDM models
repair, the machine
thoroughly, especially around the oil filter, spark
plugs, valve cover, side panels, carburettors, etc.
Cleaning will help ensure that dirt does not
contaminate the engine and will allow you to
detect wear and damage that could otherwise
easily go unnoticed.
4 Certain maintenance information is sometimes
printed on decals attached to the motorcycle. If
the information on the decals differs from that
included here, use the information on the decal.
the measurement after the bike has been ridden.
If the chain's still tight in the same area, it may be
damaged or worn. Because a tight or kinked
chain can damage the transmission countershaft
bearing, it's a good idea to renew it.
5 Check the entire length of the chain for
damaged rollers, loose links and pins, and
missing O-rings and renew it if damage is found.
Note: Never install a new chain on old sprockets,
and never use the old chain if you install new
sprockets - renew the chain and sprockets as a
set.
6 If you suspect that the chain may be worn out,
you can measure a 10-link length and compare it
with the wear limit. This requires the chain to be
removed from the bike and first cleaned (see
Chapter 6).
7 Remove the front sprocket cover (see Chapter
6). Check the teeth on the engine sprocket and
the rear wheel
illustration).
8 Inspect the drive chain slider on the swingarm
for excessive wear and renew it if worn (see
Chapter 6).
Adjustment
9 Rotate the rear wheel until the chain is
positioned with the tightest point at the centre
REAR SPROCKET
of its bottom run, then place the machine on
WORN TOOTH
its sidestand. On TDM models, slacken the
brake caliper bracket bolt on the top of the
swingarm (see illustration).
10 Where fitted, remove the split pin from the
rear axle nut. Slacken the nut (see illustrations).
1.10b Rear axle nut (arrowed) -
TRX models
should be cleaned
sprocket for wear (see
Scaned by Stalker