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We offer two different big bore kits for your thumper: 143cc, and
160cc. The 160cc kit requires boring your cases to accept the new cylinder spigot; the 143cc kit does not. We can
provide a stand-alone kit for the DIY guys, or we can install the kits for you. We also do the boring of the cases.
Our big bore kits provide more torque, quicker throttle response, and better top end power. This gives you a substantial
gain over stock horsepower. Both the 143cc and 160cc kits include a piston kit, a cylinder sleeve, and new head and base
gaskets. Both kits require machining your
existing cylinder to accept the new sleeve; they then require finish-boring. The 160cc kit requires case boring to accept
the larger sleeve.
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Stand-alone kits: $299
Installation: $180
Bore crank cases (160cc only): $120
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Our performance clutch kit includes a clutch cover gasket, friction
plates, machined steel plates, a B&J clutch cable, and a performance clutch lever assembly. (Hydraulic clutch models do
not include the cable and lever assembly.)
We found that the stock clutch plate thickness was changing with temperature,
resulting in a change in the release point at the lever; the clutch was also prone to engaging abruptly. This was caused by
two problems: clutch fiber composition and oil passage through the clutch. We have produced new, space-age compound fiber
plates to be used with our custom-machined steel plates, allowing for more even oil dispersion and reduced heat-related expansion
and harsh clutch engagement. In other words, it promotes smoother engagement. Also included in the clutch kit is a B&J-designed clutch cable that is assembled with a seven-seven strand of
aircraft-grade inner cable inside a flat-wound housing with a nylon inner sheath for maximum strength and flexibility. Finally,
our lever assembly improves your clutch pull leverage ratios and adds smooth feel to your clutch's engagement.
For the hopped-up engines, we offer a slightly heavier clutch spring kit.
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B&J Clutch Pack (non-hydraulic):
$74.00
Clutch plate machining: $65.00
Performance
Clutch Kit $132.00
Complete Cable Clutch Kit $200.00
Adjustable lever: $28.95
Clutch Cable:
$34.95
Heavy-duty Clutch Spring Kit: $15.00
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We found the choke actuator bracket to be a little sub-standard, so
we manufactured a more substantial bracket. We also offer a choke cable, which allows better routing to reduce cable chafing.
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Choke cable: $28.95
Custom bracket: $16.95
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We can rebuild your silencer with our custom-fabricated perforated core.
Our core is on the left in the photo; the stock perforated core is on the right. This modification will give you better bottom-end
and a sweet barking tone!!! If you prefer, we can provide the core only without the rebuild.
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Core only: $24.95
Rebuild: $60.00
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- We have found that increasing the size of the pilot jet to 17.5
will help both performance and reduced warm-up times. In stock!!
- We have available handlebar mounts that will allow your Scorpa to accept 7/8" bars.
- Changing your stock Scorpa tapered bars to Renthals (5", 5.5", or 6") will change the height
of the bars for a better and more comfortable riding position.
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17.5 pilot jet: $8.95
Bar mounts: $60.00
Renthals: $85.00 |
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Clip-on
Number Plate
Manufactured of high-quality, hard plastic impervious to gasoline and chemicals.
$20.00
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Renthal Handlebars, 5" / 5.5" / 6"
High quality alloy braced 7/8" trials handle bars. Gun metal gray. Cross bar pad not included.
$85.00
Renthal cross bar pad available
separately
$15.95 Sammy Miller cross bar
pad $15.95
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Pro Taper Handlebars
High-strength
2014-T6 aerospace alloy rated at 70,000 psi ultimate strength; 7/8" diameter. 1/4" cut guides for precise modivication.
Knurled clutch side for secure grip hold. Shot-peened finish to increase fatigue life. Cold-forged crossbar with stainless
hardware. Crossbar pad included.
$64.99
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Renthal Grips
Renthal grips in medium compound: $13.95 Renthal cross
bar pad in blue, black, or red: $22.95
Sammy Miller cross bar pad: $15.95
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High quality fabrication. Unique design features easy
on and off. Fits all bars. Looks great and protects! Available in 12mm or 14mm
$20.95
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Adjustable Lever Assembly
Alloy adjustable clutch lever for cable-operated clutches. Forged
construction in anodized silver finish. Features 3 cable tension adjusting points; softens pull. We use it as a brake lever,
too!
$28.95
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Domino Throttle Assembly
Slow- (black tube) or fast- (white tube) trials throttle
assembly.
Black Tube $26.95 White Tube $28.95
Replacement cable wheel or cap
$3.95 ea
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Domino Throttle Assembly
Aluminum
tube throttle assembly (fast or slow turn).
$49.95
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Cable Luber
Used
to inject lubricant into the cable housing. Clamps over the housing and wire, allowing an aerosol can to be connected. Once
the lube runs out the far end, the cable is lubricated.
$9.99
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 Sprockets
Rear sprockets $ Front sprockets $
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428 Chain
Heavy-duty chain, includes extra master link
$37.95 Additional master link $1.99
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Chain Break Tool
Heat-treated, replacement
tip included. $19.95
Extra tip $2.95
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Chain
Lube
We recommend Silkolene Chain Lube.
This is the
first fully synthetic racing
chain lubricant for motorcycles. 14.5 oz
$11.99 Semi-synthetic Silkolene Chain Lube.
Suitable
for all types of chain including o-ring. 16 oz
$8.99
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Yamaha-Style
Kill Button
$15.95
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In-line
Fuel Filter
Fits 1/4" fuel line.
$1.99
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Motorcycle
Fuel Line
Black fuel line, compatible with a wide range
of high performance additives. Extremely flexible, resists kinking.
3/16" $1.60/ft
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Don't
forget your air filter oil!
Silkolene foam
filter oil is a high-technology coating treatment for all foam filtrs. It contains polymeric additives which provide a hyper-tacky
surface to resist sand, dust and water, but not air flow. It applies extra thin to penetrate and then sets highly-tacky.
Pint - fluid $14.50
16 oz aerosol $9.99
Maxima FFT foam filter oil is a waterproof
filter protection against dirt and fine dust. Its synthetic formula does not restrict air flow, plug filter cells, or migrate
off the filter.
16 oz $7.08
Liter $9.81
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Chemicals
We proudly offer both Silkolene and Maxima pre-mix, gear oil,
fork oil and anything else you need! Call for pricing!
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Fork Seals & Wipers
Seal & wiper set $
Seals only, pair $
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Maxima
& Silkolene Fork Oil
Silkolene fork
oil is an advanced formula front suspension fluid that reduces wear, resists corrosion and oxidation. In light, medium, and
interrmediate weights.
Liter $9.50 ea
Maxima fork oil has a high viscosity of
190+ which provides uniform fork action over a wide temperatur range. Special additives control anti-foaming, rust and corrosion.
In light, medium and intermediate weights.
16 oz $4.89 ea
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Rim
Locks
1.6, 1.85, 2.15
$7.99 ea
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Trials Tires
IRC Trials Tires
& Tubes
Tube-Type Front $80
Tube, front $12
Tubeless Rear $130
Michelin
Trials Tires
Tube-Type Front $112
Tube, front $13
Tubeless Rear $183
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Please clean your engine and/or components prior to shipping.
If we have to clean the engine and/or components
prior to repair or modification, there will be an additional $65/hr charge. |
Engine Rebuild (plus parts/machining) |
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Fork Rebuild (plus parts) |
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Shock Rebuild (plus parts) |
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Powder Coat (plus supplies) |
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