dial, jet, kit, high, performance, snowmobile, atv, motorcycle, mikuni, carburetor, clutch, dial-a-jet, mikuni, keihin, thunder, powerjet, fuel, jet kit, dirt bikes, scooters, go karts, junior dragster, UFO, TPI, Valve, VIP, ultimate flow optimizer, total performance intake, velocity, intense, arctic cat, polaris, comet, quad cam, yamaha, ski-doo, thunder shift arms, rollers, heavy hitter, tach, silencer, fork seals, mini light, belt, adjuster, adjustable, torque, wing, recreational, Kawasaki, Suzuki, Can Am, Bombardier, vehicle, Hot Wires, IntelAJet

dial, jet, kit, high, performance, snowmobile, atv, motorcycle, mikuni, carburetor, clutch, dial-a-jet, mikuni, keihin, thunder, powerjet, fuel, jet kit, dirt bikes, scooters, go karts, junior dragster, UFO, TPI, Valve, VIP, ultimate flow optimizer, total performance intake, velocity, intense, arctic cat, polaris, comet, quad cam, yamaha, ski-doo, thunder shift arms, rollers, heavy hitter, tach, silencer, fork seals, mini light, belt, adjuster, adjustable, torque, wing, recreational, Kawasaki, Suzuki, Can Am, Bombardier, vehicle, Hot Wires, IntelAJet, temperature, altitude
 

dial, jet, kit, high, performance, snowmobile, atv, motorcycle, mikuni, carburetor, clutch, dial-a-jet, mikuni, keihin, thunder, powerjet, fuel, jet kit, dirt bikes, scooters, go karts, junior dragster, UFO, TPI, Valve, VIP, ultimate flow optimizer, total performance intake, velocity, intense, arctic cat, polaris, comet, quad cam, yamaha, ski-doo, thunder shift arms, rollers, heavy hitter, tach, silencer, fork seals, mini light, belt, adjuster, adjustable, torque, wing, recreational, Kawasaki, Suzuki, Can Am, Bombardier, vehicle, Hot Wires, IntelAJet, made, in, USASuperior Performance Products for Snowmobiles, Motorcycles,
ATVs, Dirt Bikes, Scooters, Go Karts, and Jr. Dragsters.

Our Current Time>>>>
 
HOME
Carburetion:
DIAL-A-JET
INTELAJET
THUNDER POWERJET
VIP
UFO
INJECTOR PERFECTOR
JUMBO JET
EASYTUNE PILOT ADJUSTORS
DEEP WELL FLOAT
BOWL NUTS
CARBURETOR
DRAIN KIT
Airbox:
TPI VALVES
UNI FILTERS
  Closeouts
   50% OFF  
POLARIS AIRBOX SYNCH KIT
Clutching:
Polaris ATV
ARCTIC CAT SNOWMOBILE
POLARIS
SNOWMOBILE
SKI-DOO
SNOWMOBILE
YAMAHA
SNOWMOBILE
GLIDE WASHERS
CLUTCH C CLAMP
BOYESEN Reeds, Rage
& X-Wings:
BOYESEN:
HARLEY DAVIDSON
BOYESEN:
SNOWMOBILE
YAMAHA BANSHEE
Other:
 
ULTRA Q  SILENCERS
MINI FLEX LIGHT
HOTWIRES
SPARK PLUG INDEX WASHERS
TACH/HOUR METER
LEAK PROOF MOTORCYCLE  FORK SEALS
HEAT LOC HANDGUARDS
Clearance
Surplus Inventory
Testimonials
MAGAZINE REVIEW & ARTICLES
LINKS/RACER INFO
TERMS

 

Leak Proof Fork Seals
The world's best fork seals

Leak Proof Pro-Moly Fork seals motorcycle dirt bike


All Leak Proof Seals have a
patented pressure balance design
which means
 the more pressure exerted,
 the tighter they seal.

Don't go through all the work of replacing
your fork seals without using
 the best seals on the planet.

 

Leak Proof CLASSIC Fork Seals - 72 Series Part Number  - $22.35

• Reduces Break-Away Friction (Stiction) by 20% over OEM Seals

• Reduces Running Friction by 20% over OEM Seals

• Rated up to 200 PSI nearly 4 times greater than OEM

• Seals effectively in Pressurized or Non-Pressurized Forks

• Push-In Installation . . . No special tools required.

• Lifetime Warranty to original owner (Does not include labor)

 

Leak Proof Pro-Moly Fork Seals - 52 Series Part Number - $27.45

• Reduces Break-Away Friction (Stiction) by 60% over OEM Seals

• Reduces Running Friction by 60% over OEM Seals

• Rated up to 200 PSI nearly 4 times greater than OEM

• Premium Blend Buna-N Rubber with New Patent Pending G+ Formula Compound

• Improved Abrasion Resistance

• Seals effectively in Pressurized or Non-Pressurized Forks

• Push-In Installation . . . No special tools required.

• Lifetime Warranty to original owner (Does not include labor)

 

Leak Proof American Classic Fork Seals for Harley Davidson - 92 Series Part Number - $24.85

• Reduces Break-Away Friction (Stiction) by 60% over OEM Seals.

• Reduces Running Friction by 60% over OEM Seals.

• Rated up to 200 PSI nearly 4 times greater than OEM.

• Premium Blend Buna-N Rubber with New Patent Pending G+ Formula Compound.

• Improved Abrasion Resistance.

• Seals effectively in Pressurized or Non-Pressurized Forks.

• Push-In Installation . . . No special tools required.

• Lifetime Warranty to original owner (Does not include labor)

 

ProWiper and Wiper/Seal Kit Information and pricing

Save big $$ - buy the Seals and Wiper kit as a package

Includes 1 pair of Leak Proof ProWipers and 1 pair of Leak Proof ProMoly Seals

 

Applications and pricing (click by brand on dirt or street)

             Aprilia                  Off-Road        Street Bike

             Beneli                                          Street Bike

             BMW                                            Street Bike

             Bultaco                Off-Road

             Cagiva                 Off-Road        Street Bike

             Can-Am               Off-Road

             Ducati                                          Street Bike

             Honda               Dirt Bike           Street Bike

             Husqvarna          Off-Road

             Kawasaki         Dirt Bike           Street Bike

             KTM                     Off-Road

             Maico                   Off-Road 

             Suzuki                 Dirt Bike          Street Bike

            Triumph                                      Street Bike

             Yamaha            Dirt Bike          Street Bike

             Harley Davidson                    Street Bike
 

Leak Proof Seals are available for many motorcycles and ATV's not listed by make or model.
You can find your seal by using the size chart below by:

  1. Measure the outside diameter (OD) of your fork seal

  2. Measure the fork leg to get the inside diameter (ID) of your fork seal

  3. Order the number matching your measurements

Cross Reference Chart
Seal Size to Seal Number

Seal Size Classic Seal Pro-Moly Seal
25mm x 35mm 7219  
26mm x 36mm x 10.5 7241  
26mm x 37mm x 10.5 7240  
27mm x 37mm x 7.5 7226  
27mm x 39mm x 10.5 7218 5218
28mm x 40mm 7231  
30mm x 40mm 7215  
30mm x 40.5mm 7208  
30mm x 42mm x 10.5 7237 5237
31mm x 43mm x 10 7210 5210
32mm x 42mm 7214  
32mm x 44mm x 10.5 7222  
33mm x 44mm 7212  
33mm x 45mm x 10.5 7245 5245
33mm x 46mm x 10.5 7211 5211
33mm x 47mm 7220  
33.10mm x 47.50mm 7217 5217
34mm x 46mm x 10.5 7207 5207
34.48mm x 47.70mm 7228 5228
34.60mm x 49.20mm 7216 5216
35mm x 45mm 7203  
35mm x 46mm x 11 7213  
35mm x 47mm x 10.5 7201 5201
35mm x 48mm x 10.5/11 7209 5209
35mm x 48mm x 8 7250  
36mm x 46mm 7233*  

36mm x 47mm

 7204  
36mm x 48mm x 10.5/11 7206 5206
36mm x 48mm x 8 7251 5251
37mm x 48mm x 10.5 7225  
37mm x 49mm x 8 7239 5239
37mm x 50mm x 11 7244 5244
37.75mm x 47.52mm 7230*  
37.75mm x 48mm 7232  
37.75mm x 50mm 7221*  
38mm x 50mm x 10.5 7224 5224
38mm x 50mm x 8 7252 5252
38mm x 52mm x 11 7255  
39mm x 51mm x 10 7248 5248
39mm x 52mm x 11 7236 5236
39mm x 52mm x 11 7249 5249
40mm x 50mm 7256 5256
40mm x 52mm x 10.5 7234 5234
40mm x 52mm x 8 7253 5253
41mm x 53mm x 10.5 7235 5235
41mm x 53mm x 8/9.5/10.5 7254 5254
41mm x 54mm x 11 7247 5247
41.30mm x 54mm 7227 5227
41.65mm x 55mm 7242 5242
43mm x 54mm x 9 7246 5246
43mm x 55mm x 9.5/10.5/11 7243 5243
45mm x 57mm x 11 7257 5257
45mm x 58mm 7259 5259
46mm x 58mm x 10.5 7258 5258
47mm x 58mm x 10 7260 5260
49mm x 60mm x 10 7261 5261
48mm x 58mm x 8.5/10 7263 5263

          Pricing:

Classic Seal Numbers 7201-7263   -   $22.35
except *7221, 7230 & 7233   -   $44.60

ProMoly Seal Prices   -    $27.45
 

All LEAK PROOF SEALS/WIPERS come with a lifetime guarantee to the original owner.
 


THUNDER PRODUCTS, INC.
21676 Deep Lake Road
Richmond, MN  56368
Phone - 320-597-2700
Fax - 320-300-4830

Summer business hours:  Mon through Thurs 9am - 5pm, Fri 9am - 12:00pm CDT
Saturday by chance only.  Closed Sundays.

Technical questions can be answered by telephone only during regular business hours.
©2003-2012 Thunder Products, Inc.