Yamaha TMAX TECH MAX 2020 - Removing the Camshafts; Checking the Camshafts

5-14
CAMSHAFTS
EAS30256
REMOVING THE CAMSHAFTS
1. Align:
• “I” mark “a” on the generator rotor
(with the stationary pointer “b” on the genera-
tor cover)
a. Turn the crankshaft clockwise.
b. When piston #1 is at TDC on the compres-
sion stroke, align the “I” mark “a” on the
generator rotor with the stationary pointer
“b” on the generator cover.
TIP
• TDC on the compression stroke can be found
when the cylinder #1 camshaft lobes are
turned away from each other.
• In order to be sure that the piston is at TDC, the
alignment marks “c” on the intake camshaft
sprocket and the alignment marks “d” on the
exhaust camshaft sprocket must align with the
cylinder head mating surface as shown in the
illustration.
2. Remove:
• Timing chain tensioner “1”
• Timing chain tensioner gasket
3. Remove:
• Intake camshaft cap
• Exhaust camshaft cap
• Dowel pin
NOTICE
ECA13720
To prevent damage to the cylinder head,
camshafts or camshaft caps, loosen the
camshaft cap bolts in stages and in a criss-
cross pattern, working from the outside in.
4. Remove:
• Intake camshaft
• Exhaust camshaft
TIP
To prevent the timing chain from falling into the
crankcase, fasten with a wire “1”.
EAS30257
CHECKING THE CAMSHAFTS
1. Check:
• Camshaft lobe
Blue discoloration/pitting/scratches 
Replace the camshaft.
2. Measure:
• Camshaft lobe dimension “a”
Out of specification  Replace the camshaft.
b
a
1
1