Sunnen Honing

what size piston ring do i need?

i have a 1995 xr100r my rings gone bad n need new ones but do not no what size . the engine is stock no upgrades n im looking for the cheapest rings(if found some one was 53.50mm another 57 n 58 ) so now im confused what do i get..

The correct way to go about this is to measure the skirt of the piston *at right angles to the wrist pin. Use a dial bore gauge, measure the cylinder diameter. Subtract the piston diameter from the cylinder measurement to get skirt clearance. The manufacturer of the engine will know what this clearance should be.

Ring end gap is simple. Slide the ring down in the cylinder using the top of the piston. Measure ring end gap with feeler gages. If the rings are too tight engine shops have ring end gap grinders. The manufacturer of the engine will know what the ring end gap should be also.

Small engines very often have .003, .005 & .010 over pistons & rings if the skirt clearance is too loose. A Sunnen honing machine is used to attain cylinder straightness and open up the bore to fit the new pistons with adequate skirt clearance. Any engine rebuilding shop can do this for you.

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Sunnen Diamond Honing Head 2100 2120 Crt642110sd7ca
Sunnen Diamond Honing Head 2100 2120 Crt642110sd7ca
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Bates B20 C46 2 CBN Honing Stone Borazon Sunnen K20 NM85 619 744 400 Gr C5
Bates B20 C46 2 CBN Honing Stone Borazon Sunnen K20 NM85 619 744 400 Gr C5
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SUNNEN 1800 HONE POWERSTROKER
SUNNEN 1800 HONE POWERSTROKER
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Sunnen Hone Model MBB1290D MS Inv25328
Sunnen Hone Model MBB1290D MS Inv25328
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Sunnen Hone Mandrel AAA L16 838 AS
Sunnen Hone Mandrel AAA L16 838 AS
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Sunnen Hone Mandrel L0G 20 962
Sunnen Hone Mandrel L0G 20 962
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Sunnen Hone Mandrel AAA L16 862 AS
Sunnen Hone Mandrel AAA L16 862 AS
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Sunnen Hone Mandrel AAA L16 831 AS
Sunnen Hone Mandrel AAA L16 831 AS
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Sunnen Hone Mandrel AAA L16 775 AS
Sunnen Hone Mandrel AAA L16 775 AS
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Sunnen Hone Mandrel L0S 20 650
Sunnen Hone Mandrel L0S 20 650
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Sunnen Hone Mandrel L0S 16 557
Sunnen Hone Mandrel L0S 16 557
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Sunnen Hone Mandrel L20 619 AS
Sunnen Hone Mandrel L20 619 AS
$49.99
L4 J85 SUNNEN HONING STONE 12 STONES L4J85
L4 J85 SUNNEN HONING STONE 12 STONES L4J85
$30.00
NEW BOX SUNNEN HONING STONES USA K20 J93  12 STONES PER BOX
NEW BOX SUNNEN HONING STONES USA K20 J93 12 STONES PER BOX
$29.96
Sunnen Model Precision Honing Machine
Sunnen Model Precision Honing Machine
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SUNNEN PRODUCTS CO MMB 166OE PRECISION HONE SN 89147 60HZ 3PH 460V
SUNNEN PRODUCTS CO MMB 166OE PRECISION HONE SN 89147 60HZ 3PH 460V
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NEW BOX OF SUNNEN HONING STONES USA K16 J93  12 STONES PER BOX
NEW BOX OF SUNNEN HONING STONES USA K16 J93 12 STONES PER BOX
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NEW BOX OF SUNNEN HONING STONES USA L16 A57 6 STONES PER BOX
NEW BOX OF SUNNEN HONING STONES USA L16 A57 6 STONES PER BOX
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1991 SUNNEN PRODUCT CO MBC 1805E PRECISION HONING MACHINE
1991 SUNNEN PRODUCT CO MBC 1805E PRECISION HONING MACHINE
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Sunnen Precision Diamond Hone 11581 11E830D511581T
Sunnen Precision Diamond Hone 11581 11E830D511581T
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Sunnen Precision Diamond Hone 7302 8E830D57302T
Sunnen Precision Diamond Hone 7302 8E830D57302T
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NEW BOX OF SUNNEN HONING STONES USA K10 A57 12 STONES PER BOX
NEW BOX OF SUNNEN HONING STONES USA K10 A57 12 STONES PER BOX
$18.96
Sunnen Hone Grinding Stones 11 L16A47
Sunnen Hone Grinding Stones 11 L16A47
$25.00
Sunnen Hone Grinding Stones 12 K16A63
Sunnen Hone Grinding Stones 12 K16A63
$20.00
SUNNEN CK 4155 SETTING GAGE FOR CK 4000 LARGE HONING HEAD FOR CK 10 CV 616 HONE
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NEW BOX OF SUNNEN HONING STONES USA K10 J93 12 STONES PER BOX
NEW BOX OF SUNNEN HONING STONES USA K10 J93 12 STONES PER BOX
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LOT OF OF FOUR 4 NEW BOXES OF TWELVE SUNNEN HONING STONES USA K5 J93
LOT OF OF FOUR 4 NEW BOXES OF TWELVE SUNNEN HONING STONES USA K5 J93
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Sunnen Vertical Hone Model SV 1010 24 Stroke
Sunnen Vertical Hone Model SV 1010 24 Stroke
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Sunnen Honing Machine MBB 1690 C
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Sunnen honing mandrel SL780 SU102
Sunnen honing mandrel SL780 SU102
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Sunnen SL 38 Manderl honing rack 1 1 2 Diameter Shank Holds 8 Manderls
Sunnen SL 38 Manderl honing rack 1 1 2 Diameter Shank Holds 8 Manderls
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NEW SUNNEN HONE Y32 A65 STONES  2 PACK  Y32A65
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Free Shipping AK20 744UA SUNNEN HONE MANDREL W ADAPTER
Free Shipping AK20 744UA SUNNEN HONE MANDREL W ADAPTER
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SUNNEN L16J65 HONING STONES 6 STONE PACK
SUNNEN L16J65 HONING STONES 6 STONE PACK
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Sunnen Mandrel 3G P20 625AS Honing Range 619 656 3 stone mandrel
Sunnen Mandrel 3G P20 625AS Honing Range 619 656 3 stone mandrel
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Sunnen Hone Grinding Stones 17 pcs K16A43
Sunnen Hone Grinding Stones 17 pcs K16A43
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Sunnen Hone Grinding Stones 12 pcs K18A45
Sunnen Hone Grinding Stones 12 pcs K18A45
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12 SETS Sunnen Y32 A55 10 Boxes Two Ea Honing Stones 20 total + 2 Sets Y32 J45
12 SETS Sunnen Y32 A55 10 Boxes Two Ea Honing Stones 20 total + 2 Sets Y32 J45
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