American Motorcycle Dealer AMD 251 June 2020 | Page 52

Twin Power Additions
4.25-inch M-8
Big Bore Cylinders
O2 Sensor
PARTS AND ACCESSORIES
Generally accepted as the go-to for M-8 upgrades,
4.25" big bore cylinders have become established as
the M-8 upgrade sweet spot.
These Twin Power 4.25 inchers are factory fitted for
the popular Wiseco Black Edition pistons. When
combined with Twin Power gaskets, a 107 cubic inch
engine can be converted to 124 cubic inches, and a
114 cubic inch to 128 cubic inches.
Twin Power Brand Manager James Simonelli says:
"This is strictly a bolt-on kit, as the special gaskets
eliminate the need to weld or otherwise modify oil
or water passages. Machining of the crankcase is
also not required. Gasket kits are available with
either .030" or .040" thick head gaskets based on
the builder's preference."
The cylinders are offered in a factory style black
textured powder-coat finish with highlighted fins.
Cast-in iron liners ensure strength, durability and
quiet operation. Cylinders are sold in pairs and
include cylinder head dowels.
"The M-8 has shown incredible performance
potential, and this kit really wakes up a stocker," says
James. "On a 107" dresser with no headwork, TTS
250 cam and valve springs, 62 mm throttle body, a
performance intake and 2:1 exhaust, we achieved
139.63 hp and a whopping 142.65 ft. lbs. of torque
with a tabletop flat torque curve."
"Twin Power oxygen sensors are precision-made for
outstanding performance. They feature extra-high
temperature dual-shield ends and are direct fit. No
modifications are needed. Made in the USA, they
meet OEM specifications.
Cam Change Gasket Kits
Kits include all gaskets, seals and O-rings necessary
for a camshaft change.
34T Compensator
Eliminators
Crankshaft Position Sensor
Twin Power 34T compensator eliminators eliminate
slipping, reduce noise and improve starting and
starter life and reduce spinning weight by 4.8 lbs.
Machined from 4140 tool steel and heat-treated,
they do not require alternator rotor replacement.
Available for a wide range of M-8 Touring/Softail and
Twin Cam Big Twins as appropriate.
Twin Power offers a crankshaft position sensor with
exact OEM fit, form and function. Endurance tested
to 60,000 miles to ensure sensor longevity; OEMstyle
connector.
TUCKER V-TWIN
Fort Worth, Texas, USA
Tel: [phone]
www.tucker.com/v-twin
www.twinpower-usa.com
52 AMERICAN MOTORCYCLE DEALER - JUNE 2020 www.AMDchampionship.com