Service data of cylinder, piston and piston ring (Suzuki Boulevard M109R, 2006-2025) [Information for owner: Technical characteristics]

Unit: mm (in)

ITEM	STANDARD		LIMIT
Compression pressure (Automatic de-comp. actuated)	1 100 - 1 500 kPa (11.0 - 15.0 kgf/cm², 156 - 213 psi)		800 kPa (8.0 kgf/cm², 114 psi)
Compression pressure difference	—		200 kPa (2.0 kgf/cm², 28 psi)
Piston to cylinder clearance	0.018 - 0.043 (0.0007 - 0.0017)		0.120 (0.0047)
Cylinder bore	112.000 - 112.015 (4.4094 - 4.4100)		Nicks or Scratches
Piston diam.	111.967 - 111.983 (4.4081 - 4.4088) Measure at 10 mm (0.4 in) from the skirt end.		111.880 (4.4047)
Cylinder distortion	—		0.05 (0.002)
Piston ring free end gap	1st	Approx. 15.7 (0.62)	12.6 (0.50)
Piston ring free end gap	2nd	Approx. 14.5 (0.57)	11.6 (0.46)
Piston ring end gap	1st	0.10 - 0.25 (0.004 - 0.010)	0.50 (0.020)
Piston ring end gap	2nd	0.10 - 0.25 (0.004 - 0.010)	0.50 (0.020)
Piston ring to groove clearance	1st	—	0.180 (0.0071)
Piston ring to groove clearance	2nd	—	0.150 (0.0059)
Piston ring groove width	1st	0.93 - 0.95 (0.0366 - 0.0374)	—
	1st	1.55 - 1.57 (0.0610 - 0.0618)	—
	2nd	1.21 - 1.23 (0.0476 - 0.0484)	—
	Oil	2.51 - 2.53 (0.0988 - 0.0996)	—
Piston ring thickness	1st	0.86 - 0.91 (0.034 - 0.036)	—
	1st	1.38 - 1.40 (0.054 - 0.055)	—
	2nd	1.17 - 1.19 (0.046 - 0.047)	—
Piston pin bore I.D.	23.002 - 23.008 (0.9056 - 0.9058)		23.030 (0.9067)
Piston pin O.D.	22.995 - 23.000 (0.9053 - 0.9055)		22.980 (0.9047)

Service data of cylinder, piston and piston ring (Suzuki Boulevard M109R)