User Guide

Chapter 2 Part A Engine, clutch and transmission (XV535 models)
2A-59
28.26b The assembled gears and shafts should look like this
30 Recommended break-in procedure
1 Any rebuilt engine needs time to break-in, even if parts have been
installed in their original locations. For this reason, treat the machine
gently for the first few miles to make sure oil has circulated throughout
the engine and any new parts installed have started to seat.
2 Even greater care is necessary if the engine has been rebored or a
new crankshaft has been installed. In the case of a rebore, the engine
will have to be broken in as if the machine were new. This means
greater use of the transmission and a restraining hand on the throttle
until at least 500 miles have been covered. There's no point in keeping
to any set speed limit - the main idea is to keep from lugging the
engine and to gradually increase performance until the 500 mile mark
is reached. These recommendations can be lessened to an extent
when only a new crankshaft is installed. Experience is the best guide,
since it's easy to tell when an engine is running freely. The following
recommendations, which Yamaha provides for new motorcycles, can
be used as a guide:
a) 0 to 90 miles (0 to 150 km): Keep engine speed below 3,000 rpm.
Turn off the engine after each hour of operation and let it cool for
5 to 10 minutes. Vary the engine speed and don't use full throttle.
b) 90 to 300 miles (150 to 500 km): Don't run the engine for long
periods above 4,000 rpm. Rev the engine freely through the gears,
but don't use full throttle.
c) 300 to 600 miles (500 to 1000 km): Don't use full throttle for
prolonged periods and don't cruise at speeds above 5,000 rpm.
d) At 600 miles (1,000 km): Change the engine oil and filter. Full
throttle can be used after this point.
3 If a lubrication failure is suspected, stop the engine immediately
and try to find the cause. If an engine is run without oil, even for a short
period of time, severe damage will occur.