User Guide

Chapter 2 Part A Engine, clutch and transmission (XV535 models)
2A-47
25.6 Place the crankshaft in V-blocks or a holding fixture and
check for runout with a dial indicator
25.7a Measure journal diameter with a micrometer
25.7b Measure main bearing diameter with a hole gauge ...
25.7c ... then measure the gauge diameter with a micrometer
25.10 Press the main bearing out; apply pressure from the side
opposite the locating tab
several times - if a journal picks up copper from the coin, it's too rough.
Replace the crankshaft.
5 Check the camshaft chain sprockets on the crankshaft for
chipped teeth and other wear. If any undesirable conditions are found,
replace the crankshaft. Check the chains as described in Section 17.
Check the rest of the crankshaft for cracks and other damage. It
should be magnafluxed to reveal hidden cracks - a dealer service
department or motorcycle machine shop will handle the procedure.
6 Set the crankshaft on V-blocks and check the runout with a dial
indicator touching the alternator and clutch mounting surfaces (see
illustration). Compare your findings with this Chapter's Specifications.
If the runout exceeds the limit, replace the crank.
Main bearing selection
Note: This procedure requires precision measuring equipment, a press
and a special Yamaha tool. If you don't have the necessary equipment,
have the procedure done by a dealer service department or motorcycle
repair shop.
Refer to illustrations 25.7a, 25.7b, 25.7c, 25.10, 25.11a, 25.11b,
25.11c and 25.11d
7 Measure the diameter of the main bearing journals with a
micrometer (see illustration). Measure the inside diameter of the main
bearings with a hole gauge and micrometer (see illustrations). The
difference between the two measurements is bearing clearance.
8 The clearance should be within the range listed in this Chapter's
Specifications.
9 If clearance is greater than the service limit listed in this Chapter's
Specifications and new bearings don't solve the problem, replace
the crankshaft.
10 If the clearance is greater than the service limit listed in this
Chapter's Specifications but journal diameter is within specifications,
press the main bearings out of their bores (see illustration).
11 Measure the diameter of the bearing bores in the crankcase
halves with a micrometer. If they're greater than the maximum listed in
this Chapter's Specifications, replace the crankcase halves as a set. If