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"Where-'n-'Ell"
to get great parts for your outboard?

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WSM Piston
with Moly
Coating

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If your Mfgr. says:

That motor's 7 years old!!
Part is no longer available.
We lose $$ on service!
EPA made me do it!
Part's at central warehouse, you'll get it next month.
We don't make parts for those.
We only do warranty work.
Our techs only fix late models.
No clue what's wrong! So we'll work time & material.

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REPLACEMENT PISTONS

2 & 3 CYLINDER

4 & 6 Cyl Inline Pistons are here
V6 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.

warning symbolNOTE!! Please take the time to enter the serial number of your motor.
This info will be stored in the shopping cart and sent in with your order.

 NOTES ON MERC L-3 INLINE MODELS: 
  • THE DATE OF MANUFACTURE OF YOUR L-3 OR L-4 POWERHEAD CAN BE FOUND STAMPED ON THE UPPER PORT SIDE OF THE CYLINDER BLOCK AT THE CRANKCASE SPLIT LINE.
  • ON L-3 AND L-4 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 = 646-81884
  • BOTTOM GUIDED = 638-85321
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


2 cylinder

9.9, 15 HP
     1988-1997
     serial # B233200
& up
Piston Part # 1-14-6E711631
STD BORE SIZE= 2.205"
QTY:

Size:

$36.00 each


2 cylinder

15 HP
1984-1997
serial #'s B235464-G202749
15 HP SeaPro/Marathon
1984-1997
serial #'s G044365-G202749
20-25 HP
1988-1994
serial #'s D117956-G202749
20 HP JET
1988-1994
serial #'s G044027-G202749
 

NOTE: THESE BLOCKS MUST  BE
RE-SLEEVED TO USE   OVERSIZE
PISTONS!!
OVERSIZES ONLY AVAILABLE
 IN WISECO BRAND .020, .040

Contact Us for these

Piston Part # 8600
STD BORE SIZE = 2.562"
QTY:

Size:

$145.00 each


2 cylinder

15 HP SeaPro/Marathon
1994-2000 (Mercosil Block)
serial #'s G202750-G437999
20-25 HP
1994-2000 (Mercosil Block)
serial # G202750-UP
20 HP JET
1994-2000 (Mercosil Block)
serial # G202750-UP
Piston Part # 100-04K series
STD BORE SIZE = 2.562"
QTY:

Size:

$102.00 each


2 cylinder

 
20 HP
1972-1979
 
Piston Part # 100-05K series
STD BORE SIZE = 2.565"
QTY:

Size:

$83.50 each


2 cylinder

25 HP
1984-1986
 
30 HP
1984-1986
 
 MARINER ONLY! 
Discontinued 2015
2 cylinder

30 HP JET
1998-2007
 
30-40 HP
1994-2007
 
3 cylinder

40 HP JET
1997-2004
 
50-60 HP
1998-2004
 
Piston Part # 100-06K series
STD BORE SIZE = 2.992"
QTY:

Size:

$92.00 each


2 cylinder
Original high dome pistons Discontinued
Use these low-dome 2-ring pistons instead

35 HP
1984-1989
 
40 HP
1972-1983
 
Piston Part # 100-15K series
STD BORE SIZE = 2.875"
QTY:

Size:

$89.00 each


2 cylinder

40 HP
1979-1990
 
 

 MARINER ONLY!! 

Not available in WISECO or PRO-V.
These are Pro Marine brand pistons
Piston Part # 11631
STD BORE SIZE = 2.955"
QTY:

Size:

$69.25 each


3 cylinder

50 HP
1984-1990
Crossflow Low Dome
60 HP
1984-1990
Crossflow Low Dome
65 HP
1973-1976
Crossflow Low Dome
70 HP
1977-1983
Crossflow Low Dome
 
Piston Part # WSM 100-15K
STD BORE SIZE = 2.875"
QTY:

Size:

$89.00 each


3 cylinder

50 HP
1991-1997
60 HP
1991-1997
 
Piston Part # 4700
STD BORE SIZE = 2.955"
QTY:

Size:

$85.00 each


3 cylinder

70 HP
1987-1989
Loop Charge
Bottom Guided Conn Rod
75 HP
1990-1991
Loop Charge
Bottom Guided Conn Rod
90 HP
1987-1991
Loop Charge
Bottom Guided Conn Rod
 
Piston Part # 100-25K series
STD BORE SIZE = 3.375"
QTY:

Size:

$105.75 each


3 cylinder
Original high dome pistons NLA
use these low-dome pistons instead
60 HP
1984-1990
Crossflow
65 HP
1973-1976
Crossflow
70 HP
1977-1983
Crossflow
 
 
 
 
 
Piston Part # 100-15K series
STD BORE SIZE = 2.875"
QTY:

Size:

$89.00 each


3 cylinder

 
75 HP
1992-1993
Loop Charge
Top Guided Conn Rod
90 HP
1992-1993
Loop Charge
Top Guided Conn Rod
 
Piston Part # 100-35K series
STD BORE SIZE = 3.375"
QTY:

Size:

$117.00 each


3 cylinder

 
75 HP
1994-2004
Loop Charge
90 HP
1994-2004
Loop Charge
Big Bore
 
Piston Part # 100-40K series
STD BORE SIZE = 3.500"
QTY:

Size:

$105.00 each


 
 

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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.