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WSM Piston
with Moly Coating

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That motor's 7 years old!!
Part is no longer available.
We lose $$ on service!
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Part's at central warehouse, you'll get it next month.
We don't make parts for those.
We only do warranty work.
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REPLACEMENT PISTONS

V-6 OUTBOARDS

2 & 3 Cyl Pistons are here
4 & 6 Cyl INLINE Pistons are here

MASTERTECH presents pistons for rebuilding your motor. These are WSM cast pistons unless noted 
MOST WSM PISTONS HAVE A BLACK MOLY COATING TO REDUCE FRICTION & HEAT BUILD-UP DURING BREAK-IN.
WISECO forged perfomance pistons available at extra charge.
ALL pistons come complete with rings, wristpins and retainers/clips.


NOTE!!
Please take the time to enter the Serial Number of your motor in the shopping cart. This info will be sent in with your order. Thanks!
  • NOTE: ON V-6 MOTORS TWO TYPES OF CONNECTING ROD / PISTON COMBINATIONS ARE USED - TOP AND BOTTOM GUIDED.
    THIS REFERS TO THE METHOD OF ALIGNING THE RODS TO THE CRANKPIN AND CYLINDER CENTERLINE.
    YOU CAN IDENTIFY WHICH TYPE YOU HAVE BY THE FORGING NUMBER ON THE ROD AS FOLLOWS:
  • TOP GUIDED = 644-818141
  • BOTTOM GUIDED = 636-8118
PISTONS PRICED INDIVIDUALLY. PLEASE SELECT QUANTITY AND BORE SIZE ON THE TABLES BELOW.
ORIGINAL EQUIPMENT AND OTHER BRANDS ALSO AVAILABLE.
Rings, wrist pins and retainers included
V-6 Bottom Guided Rods
636-8118 Stamped on Rods
  • 135 HP 2.0L
    1981-1991
    with Boost Port
  • 150 HP 2.0L 1979-1991

    175 HP 2.0L 1976-1981

PORT Piston
100-50PK SERIES

STD BORE SIZE = 3.125 "
QTY:

Size:

$98.75 each


STB Piston
100-50SK SERIES

STD BORE SIZE = 3.125 "
QTY:

Size:

$98.75 each


FULL SET (3 of each side)    $533.25 (10% Discount)  
Size:
V-6
  • 135 HP 2.0L
    1992-2000 with Boost Port Top Guided

  • 150 HP 2.0L
    1992-2000 with Boost Port Top Guided
PORT Piston
100-30PK SERIES

STD BORE SIZE = 3.125 "
QTY:

Size:

$111.00 each


STB Piston
100-30SK SERIES

STD BORE SIZE = 3.125 "
QTY:

Size:

$111.00 each


FULL SET (3 of each side)    $599.50 (10% Discount)
Size:
V-6

  • 135-150-175 HP
    2.5L OPTIMAX & DFI
    1998-2004 ser.'s 0G590000-0T178499
    with "O" Ring Heads
PORT Piston
100-28PK series
STD BORE SIZE = 3.500"
QTY:

Size:

$119.25 each


STB Piston
100-28SK series
STD BORE SIZE = 3.500"

QTY:

Size:

$119.25 each


FULL SET (3 of each side)    $644.00 (10% Discount)
Size:
V-6
  • 150 HP
    1998-2002

  • 150 HP XR6
    1993-2002

  • 150 HP XRI
    1992-2003

  • All 2.5L 150 HP
    1995-UP
    Top Guided

  • SPORT JET 175 HP
    ALL

    175 HP 2.5L & XRI
    1992-2000
    Top Guided

  • 200 HP 2.5L, XR1, & EFI
    1992-2000
    Top Guided

  • 200 HP 2.5L OFFSHORE
    1992-2000
    Top Guided

  • 225 HP 2.5L ALL
    Top Guided
    (see note top of page)
PORT Piston
100-20PK series
STD BORE SIZE = 3.500 "
QTY:

Size:

$115.75 each


STB Piston
100-20SK series

STD BORE SIZE = 3.500 "
QTY:

Size:

$115.75 each


FULL SET (3 of each side)    $625.00 (10% Discount)
Size:
V-6

  • 175 HP 2.4L
  • 1978-1991

    200 HP 2.4L
    1978-1990

  • These are Chrome Block motors; standard bore pistons only as DIRECT replacements.
    For Oversizes, must be sleeved to standard. These will then use different rings and bore is 3.377".
    After sleeving they can be bored to oversizes (.015 or .030) if desired.
    Please specify number of re-bored & sleeved holes, if any, in the Comments box at checkout.

    XR4 model is bored to 3.375" std and already uses steel sleeves. No re-sleeving is necessary.

  • TIP: .015 & .030 oversizes are applicable to sleeved blocks only.

    Please CONTACT US if there are any questions.
PORT Piston
2100PV  SERIES
STD BORE SIZE = 3.375"
QTY:

Size:

$87.50 each


STB Piston
2100SV  SERIES
STD BORE SIZE = 3.375"
QTY:

Size:

$87.50 each


FULL SET (3 of each side)    $498.75  
Size:
V-6
  • 200-225-250 HP
    3.0L OPTIMAX DFI
    1998-2004
    ROUND POCKET ON PISTON TOP
PORT Piston
100-48PK series
STD BORE SIZE = 3.626
QTY:

Size:

$114.25 each


STB Piston
100-48SK series
STD BORE SIZE = 3.626
QTY:

Size:

$114.25 each


FULL SET (3 of each side)    $617.00 (10% Discount)
Size:
V-6
  • 200-225-250 HP
    3.0L OPTIMAX DFI
    2004-UP
    ser.'s 0T801000-UP
    OVAL POCKET ON PISTON TOP
PORT Piston
# 100-47PK series
STD BORE SIZE = 3.625"
QTY:

Size:

$110.75 each


STB Piston #
100-47SK series

STD BORE SIZE = 3.625"
QTY:

Size:

$110.75 each


FULL SET (3 of each side) $598.00 (10% Discount)
Size:
V-6
  • 225-250 HP 3.0L
    1994-UP
    CARB & EFI

  • 250XB, 300X
    3.0L EFI
    ser. 0G980600-0T800999
PORT Piston
100-45PK SERIES

STD BORE SIZE = 3.6265
QTY:

Size:

$109.00 each


STB Piston
100-45SK SERIES
STD BORE SIZE = 3.6265
QTY:

Size:

$109.00 each


FULL SET (3 of each side)    $589.00 (10% Discount)
Size:
V-6
  • 225-250 HP PRO XS
    1994-UP
    CARB & EFI
PORT Piston#
100-51PK SERIES

STD BORE SIZE = 3.6265
QTY:

Size:

$119.25 each


STB Piston
100-51SK SERIES

STD BORE SIZE = 3.6265
QTY:

Size:

$119.25 each


FULL SET (3 of each side)    $644 (10% Discount)
Size:
 
 

We pay the freight out in USA on all orders over $100.00. Orders less than this amount will have a shipping and handling charge of $8.75 added. Some bulky and heavy items will incur additional charges. You will be notified beforehand if this is the case. Remember, all orders receive free technical support from the MasterTech!

 
 

Please review our Warranty, Returns & Refunds policies before you place an order.

DISCLAIMER

The information provided on these pages is correct to the best of my knowledge, however the MasterTech makes no warranty, express or implied, regarding the use of, results of, or liability created from, application of this data. This information is disseminated in good faith, however MasterTech assumes NO LIABILITY whatsoever in regard to this service. The information, software, products, and services published on this web site may include inaccuracies or typographical errors. Changes are periodically added to the information herein. Mastertech may make improvements to this site at any time. Parts ordered from this website may or may not be in dealer stock at the time of order. Thank you for reading.