GENERAL INSTRUCTIONS. ⢠The cylinder and piston can be serviced with the engine installed in the frame. ⢠When installing .... PISTON RING INSTALLATION.
SERVICE INFORMATION GENERAL INSTRUCTIONS • The cylinder and piston can be serviced with the engine installed in the frame. • When installing the cylinder, use a new cylinder gasket and make sure that the dowel pins are correctly installed. • After disassembly, clean the removed parts and dry them with compressed air before inspection. SPECIFICATIONS Standard (mm) SH30CA SH25CA
Item Cylinder
Piston, piston ring
I.D. Warpage Cylindricity True roundness Ring-to-groove clearance Ring end gap
57.405_ 57. 52.400_ 52. 415 0.01 410 0.01
57.50
52.50
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.09
0.09
0.05
0.09
0.09
0.15_ 0 0.30 0.15_ 0 0.30
0.50
0.50
0.15_
0.50
0.50
æ
æ
0.01 0.01 top Second top Second Oil side rail
Piston O.D. Piston O.D. measuring position . Piston-to-cylinder clearance Piston pin hole I.D. Piston pin O.D Piston-to-piston pin clearance Connecting rod small end I.D. bore
Service Limit (mm) SH30CA SH25CA
0.015_ 0.015_0
0.2_
0.01 0.01 0.05 0.015_ 0.05 0.015_0 0.30 0.15_
0.30
0.9
0.9
0.2_
57.375_ 57. 52.370_ 52. 57.30 52.30 9mm from 9mm from 9mm from 9mm from 395 bottom of skirt 390 bottom of skirt bottom of bottom of skirt 0.010_ 0.04 0.010_ 0.04 skirt0.01 0.01 15.002_0 15. 15.002_0 15. 15.04 15.04 008 14.994_ 15. 008 14.994_ 15. 14.96 14.96 000 0.002_ 15.016_4 034
000 0.01 0.002_ 15. 15.016_4
0.01
0.02
0.02
15.
15.06
15.06
034
TROUBLESHOOTING • When hard starting or poor performance at low speed occurs, check the crankcase breather for white smoke. If white smoke is found, it means that the piston rings are worn, stuck or broken. Compression too low or uneven compression • Worn or damaged cylinder and piston rings • Worn, stuck or broken piston rings Compression too high • Excessive carbon build-up in combustion chamber or on piston head
Excessive smoke from exhaust muffler • Worn or damaged piston rings • Worn or damaged cylinder and piston Abnormal noisy piston • Worn cylinder, piston and piston rings • Worn piston pin hole and piston pin • Incorrectly installed piston
7-2
7. CYLINDER/PISTON
Bet & Win 125/150 Cylinder
Cam Chain Guide
CYLINDER REMOVAL Remove the cylinder head. (!6-7) Remove the water hose from the cylinder. Remove the cylinder base bolt.
Cylinder Base Bolt
Water Hose
Remove the cam chain guide. Remove the cylinder.
Gasket
Remove the cylinder gasket and dowel pins. Clean any gasket material from the cylinder surface.
Dowel Pins
PISTON REMOVAL
Shop Towel
Piston Rings
Remove the piston pin clip. Press the piston pin out of the piston.
＊ Place a clean shop towel in the crankcase to keep the piston pin clip from falling into the crankcase.
Piston Pin
7-3
Piston
7. CYLINDER/PISTON
Bet & Win 125/150
Inspect the piston, piston pin and piston rings. Remove the piston rings.
＊ • Take care not to damage or break the piston rings during removal.
Clean carbon deposits from the piston ring grooves.
Install the piston rings onto the piston and measure the piston ring-to-groove clearance. Service Limits: Top: 0.09mm replace if over 2nd: 0.09mm replace if over
Remove the piston rings and insert each piston ring into the cylinder bottom.
＊ • Use the piston head to push each piston ring into the cylinder.
Measure the piston ring end gap. Service Limit: 0.5mm replace if over
Measure the piston pin hole I.D. Service Limit: 15.04mm replace if over
7-4
7. CYLINDER/PISTON
Bet & Win 125/150
Measure the piston pin O.D. Service Limit: 14.96mm replace if below
Measure the piston O.D.
＊ • Take measurement at 9mm from the
bottom and 90° to the piston pin hole.
Service Limit: 57.90mm replace if below SH30CA 57.30mm replace if below SH25CA 52.30mm replace if below Measure the piston-to-piston pin clearance. Service Limit: 0.02mm replace if over CYLINDER INSPECTION Inspect the cylinder bore for wear or damage. Measure the cylinder I.D. at three levels of top, middle and bottom at 90° to the piston pin (in both X and Y directions). Service Limit: 58.10mm repair or replace if below SH30CA 57.50mm repair or replace if over SH25CA 52.50mm repair or replace if over Measure the cylinder-to-piston clearance. Service Limit: 0.1mm repair or replace if over The true roundness is the difference between the values measured in X and Y directions. The cylindricity (difference between the values measured at the three levels) is subject to the maximum value calculated. Service Limits: True Roundness: 0.05mm repair or replace if over Cylindricity: 0.05mm repair or replace if over
7-5
Top Middle Bottom
7. CYLINDER/PISTON
Bet & Win 125/150
Inspect the top of the cylinder for warpage. Service Limit: 0.05mm repair or replace if over
Measure the connecting rod small end I.D. Service Limit: 15.06mm replace if over
PISTON RING INSTALLATION Install the piston rings onto the piston. Apply engine oil to each piston ring.
＊•
Be careful not to damage the piston and piston rings during assembly. • All rings should be installed with the markings facing up. • After installing the rings, they should rotate freely without sticking. • Stagger the ring end gaps as the figure shown.
Top Second
Side Rail Oil Ring Side Rail
Top Second
7-6
7. CYLINDER/PISTON
Bet & Win 125/150
PISTON INSTALLATION Remove any gasket material from the crankcase surface.
＊ • Be careful not to drop foreign matters into the crankcase.
Piston
Install the piston, piston pin and a new piston pin clip.
＊•
Position the piston “IN” mark on the intake valve side. • Place a clean shop towel in the crankcase to keep the piston pin clip from falling into the crankcase.
Piston Pin Clip
CYLINDER INSTALLATION
Dowel Pin
Install the dowel pins and a new cylinder gasket on the crankcase.
Gasket
Coat the cylinder bore, piston and piston rings with clean engine oil. Carefully lower the cylinder over the piston by compressing the piston rings.
＊•
Be careful not to damage or break the piston rings. • The piston ring end gaps should not be parallel with or at 90° to the piston pin.
7-7
Cylinder
Piston Pin
7. CYLINDER/PISTON Tighten the cylinder base bolt.
Bet & Win 125/150 Cylinder Base Bolt
Install the cam chain guide.
＊ • Insert the tab on the cam chain guide into the cylinder groove.
Connect the water hose to the cylinder. Install the cylinder head. (!6-9) Tighten the cylinder base bolt. Cam Chain Guide
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