WE MAKE CUSTOM PISTONS:If
you don't see what you're looking for below, please
email us! Send your make, model, year, plus desired bore size
and compression ration, and what you will be doing with the bike
(dragrace, roadrace, hot street, sidecar, naturally aspirated or blown,
etc). This will help us to design the perfect piston for you.
High compression kit for Drag and Road Racing. Available in 2 or 3 ring
configuration. Many custom features available;
we build them exactly the way
you
want them!
Also available for 17mm pin applications
(requires custom rods).
Please
contact us for estimated production time on this
special order kit
Piston Kit
Pistons, Rings, Pins, Clips, & MLS Head Gasket $749.95 Complete Kit
Same as above plus
Sleeves and
Viton RCS Base Gasket $1099.95
Please
contact us for estimated production time on this
special order kit
DP1000/71r
3D Under Dome Milling
available for this piston, save approx 15 grams:
998cc 71mm
12.5:1
195 Grams
FEATURES:
High compression kit for
maximum torque and horsepower! Flat top forged
piston offers better flow characteristics as
well as a design that is compatible with any
combustion chamber - no more worries about
piston to head intersection! Pistons also
feature accumulator grooves for better ring
control and smooth finished crowns.
Please
contact us for estimated production time on this
special order kit
Piston Kit
Pistons, Rings, Pins, Clips, & MLS Head Gasket $749.95 Complete Kit
Same as above plus
Sleeves and
Viton RCS Base Gasket $1099.95
Please
contact us for estimated production time on this
special order kit
DP1000/71r MOD
3D Under Dome Milling
available for this piston, save approx 15 grams:
998cc
71mm
11:1
FEATURES:
Moderately high compression kit for
impressive torque and horsepower! Flat top forged
piston offers better flow characteristics as
well as a design that is compatible with any
combustion chamber - no more worries about
piston to head intersection! Pistons also
feature accumulator grooves for better ring
control and smooth finished crowns.
Please
contact us for estimated production time on this
special order kit
DP1000r
3D Under Dome Milling
available for this piston:
998cc
71mm
10.25:1
185 grams
FEATURES:
Flat top forged piston offers better flow
characteristics as well as a design that is
compatible with any combustion chamber - no more
worries about piston to head intersection!
Pistons also feature accumulator grooves for
better ring control.
Also available for 17mm pin applications
(requires custom rods).
Please
contact us for estimated production time on this
special order kit
DP915
915cc
68mm
10.5:1
1969-78 CB750K
1975-76 CB750F
Kit includes: (4) Pistons
(4) Ring sets
(4) Wrist Pins
(8) Wrist Pin Clips
(1) MLS Head Gasket
FEATURES:
This is a gorgeous,
full-featured forged piston with Accumulator
Grooves, Contact Reduction Grooves, and Smooth
Finished Domes. An excellent choice for
street or strip!
Perfect for cleaning
up a worn 890cc engine as well.
Special price limited to stock on
hand!!
Piston Kit
Pistons, Rings, Pins, Clips, & MLS Head Gasket $599.95 Complete Kit
Same as above plus Sleeves and Viton RCS Base Gasket $899.95
DP906/sohc
906cc 67.5mm
10.5:1
169 grams
FEATURES:
A great full-featured forged
piston with Accumulator
Grooves, Contact Reduction Grooves, and Smooth
Finished Domes. An excellent choice for
street or strip!
Perfect for cleaning
up a worn 890cc engine as well.
Piston Kit includes
(4)
Pistons
(4) Ring sets
(4) Wrist Pins
(8) Clips,
(1) CFM20 Head Gasket
$749.95
DP62/r19
62mm 760cc
12.5:1
153g
DP62/r19
FEATURES:
For roadracing use Honda CR750
style
Legal for most Formula 750 Racing
2-Ring pistons
153g piston weight
+1mm oversize
Tuff Skirt Coating
Smooth Finished Domes
Accumulator Grooves
Contact Reduction Grooves
Please
contact us for estimated production time on this
special order kit
Piston Kit includes
(4)
Pistons
(4) Ring sets
(4) Wrist Pins
(8) Clips
(1) MLS Head Gasket
$749.95
Please
contact us for estimated production time on this
special order kit
DP62/r3
62mm 760cc
12.5:1
157 grams
DP62/r3
FEATURES:
For hot street OR roadracing use Honda CR750
style.
Legal for
most Formula 750 Racing.
3-Ring piston type.
+1mm oversize.
Smooth finished domes,
Accumulator grooves,
Contact reduction grooves.
FEATURES:
Smooth Finished Dome with No Sharp Edges,
Accumulator Groove for Better Ring Control,
Contact Reduction Grooves for Less Pre-ignition
For 1977-78 CB750F2
(black motor)
This kit requires cylinder
boring only.
Available with CFM-20 or MLS head gasket.
* Special price limited to
stock on hand
ABOUT THE DYNOMAN F2 PISTON
KITS:
As the 77-78 Honda 750 F2
has a 18% larger combustion chamber to compensate for the larger
valves, through the years many people have installed the standard 836cc
(ex: Wiseco K836) kits for the 69-76 engines only to discover that the
compression was too low to give them the extra power that they were
after.
Dynoman offers our custom 836, 915, and 970cc piston kits for the F2.
They have the
correct dome to raise the compression to a true 10.5:1 and 11.5:1
respectively.
These
pistons are state of the art diamond cut on CNC machines in the USA from 2618 aluminum
forgings. This is the same alloy used in many pro stock pistons. This process
makes them lighter than some of the cast pistons used in the 70s, but much
stronger. They also come with a brushed dome to smooth any sharp edges.
The
pistons feature large valve pockets for the 31 and 34mm valves used in the F2
engines. They also have
contact reduction grooves above the top ring for pre-ignition control, and
accumulator grooves below the top ring for better ring control.
The DP836/65f2 kit is
the same bore size as the standard Wiseco K836cc kit, so they are a drop in
for any F2 with the standard K836 Wiseco kit already installed.
FEATURES:
This piston kit is loaded with upgrades!!
- Lateral Gas Ports
to Assist
in Ring Seal,
- Brushed Dome with No Sharp Edges,
-
Accumulator Groove for
Better Ring Control,
-
Contact Reduction Grooves
for
Less
Pre-ignition.
This piston kit is a true 68mm size!
This kit requires
engine case boring, cylinder re-sleeving,
and heavy duty top end studs.
Complete Kit
Same as above plus Sleeves and Viton RCS Base Gasket $1099.95
Please
contact us for estimated production time on this
special order kit
DP970/70f2
970cc 70mm
11.5:1
187 grams
Feature Packed Hot Street and Racing Pistons!
Smooth Finished Crowns,
Accumulator Grooves
Contact Reduction Grooves,
Under Crown Milling for weight reduction.
This kit requires
engine case boring, cylinder re-sleeving,
and heavy duty top
end studs.
Kit includes (4) Pistons, (4) Ring sets, (4)
Pins, (8) Wrist Pin Clips, and Cometic CFM20
Head Gasket.
Complete Kit
Same as above plus Sleeves and Viton RCS Base Gasket $1099.95
Please
contact us for estimated production time on this
special order kit
CB750 DOHC 1979-82
DP835/dohc
835cc
10.5:1
65.5mm
835cc
Feature Packed Hot Street and Racing Pistons! Smooth Finished Crowns
- no hot spots
Accumulator Grooves -
better ring control
Contact Reduction Grooves
- less pre-ignition Actual 10.5:1 Compression
Ratio - more power!
(other manufacturers claim 10.25 but
are actually lower)
Bore-in with stock sleeves!
Hone in (clean up) for 823cc
kits!
Made in the USA!
Actual weight just 167 grams
Kit includes (4) Pistons, (4) Ring sets, (4)
Pins, (8) Wrist Pin Clips, and Cometic CFM20
Head Gasket.
Please
contact us for estimated production time on this
special order kit
DP1170 MOD Kit
(4)
Pistons
(4) Ring Sets,
(4) Wrist Pins
(8) Retainer Clips,
(1) MLS Head Gasket
$839.95
GS1100 G/GK 2-valve
DP GK1135
1135cc
74mm
10.25:1
For 1982-84 Suzuki GS1100 G & GK (2-valve
engines)
Featuring smooth finished domes
and accumulator
grooves. ~
Custom Features Information
Kit
includes:
(4)
Pistons, (4) Ring Sets,
(4) Piston Pins, (8) Retainer Clips,
and CFM20 Head Gasket
Please
contact us for estimated production time on this
special order kit
PISTON KIT $839.95
COMPLETE KIT $1239.95
YAMAHA FJ1100 / 1200
DP 1188
1188cc
77mm
10.25:1
For FJ1100 and FJ1200
Fully customized with Lateral Gas Porting,
Accumulator Grooves, Smooth Finished Domes, and
Contact Reduction Grooves ~
Custom Features Information
Great for hot street riding!
Kit
includes:
(4)
Pistons, (4) Ring Sets,
(4) Piston Pins, (8) Retainer Clips,
and
CFM20 Head Gasket
An accumulator groove is machined into the
land between the top and second ring. It provides additional
volume where residual combustion gases that have "blown by" the
top ring can collect. This additional volume helps to reduce
pressure between the top & second ring, thus aiding in top ring
seal and minimizing ring flutter.
LATERAL GAS PORTING
This process mills slots into the top of the
top ring groove and provides a pathway for combustion pressure
to get behind the top ring. This process helps to increase ring
seal.
SMOOTH FINISHED DOMES
Decreases hot spots
CONTACT REDUCTION GROOVES
The purpose of machining these grooves is to
reduce the amount of contact area against the cylinder wall when
the piston “rocks over”. Contact reduction also serves to
disrupt the flame travel into the crevice area thus helping to
reduce detonation.
3D UNDER CROWN MILLING
The 3D Under Crown machining process allows for
uniform deck thickness, therefore creating a lighter and more
durable piston.
photo
"ECONOMY' UNDER CROWN MILLING
Similar to above without quite as much weight
reduction. An excellent balance of cost vs. result.
FULL LIGHTENING PACKAGE
For maximum weight reduction
TUFF SKIRT COATING
JE Pistons’ trademark coating that is a
lubricating, anti-friction / anti-wear coating applied to the
piston skirt only. Unlike our standard Skirt Coating, Tuff Skirt
will not wear and is designed to withstand many different types
of endurance applications, similar to those commonly found in
NASCAR. Buildup is .0005” per surface and finished diameter of
skirt should include the coating buildup.
THERMAL CROWN BARRIER
The thermal barrier crown coating is applied
to the top of the piston and is designed to reflect heat into
the combustion chamber, thereby increasing exhaust gas velocity
and greatly improving scavenging potential. The .0015” thick
coating can also assist in extending piston life by decreasing
the rate of thermal transfer.
TULIP VALVE POCKETS
Most commonly used on Hemi and motorcycle
engines, this process leaves a raised area on plunged valve
pockets to achieve maximum compression.
ABOUT CYLINDER BOTTOM TAPER
It is common for the tapered lip that came in the bottom of your
cylinders from the factory to be removed when installing larger bore
piston kits. If the machine shop doing your boring does not taper the
bottom of the sleeves after they are bored there will be a sharp edge at
the bottom in place of the factory taper. It will need to be removed to
make ring installation easier. You can taper the sleeves by hand with a
Dremel tool or porting tool using a small 400 grit or finer sanding drum.
It is also very important to wash the bores with hot soapy water to
remove any sanding residue and oil them lightly when the tapering job is
complete. We recommend lightweight machine oil or engine oil. Following
this procedure will greatly reduced the risk of broken rings during
installation!
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All rights reserved. Prices, descriptions, and products subject to change
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dynoman-performance@austin.rr.com
YAMAHA FZ600 1986-88
