XR650RBob
XR650L
XR600R
XR400R
XR250R
XR200R
XR100/CRF100
CRF150R
CRF230
CRF250R/X
CRF450R/X
XR/CRF 50
TRX250EX
TRX250 Recon
TRX300EX
TRX450R
TRX400EX
TRX400/450 Foreman
TRX500 Foreman
TRX300 4X4
TRX680
DR250
DR350
DR 350S
DRZ250
DRZ400
DRZ400S
RMZ 250
LTZ400
KLX250
KLX300
KXF250
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KFX400
MOJAVE 250
BAJOU 220
YZF/WR 400
YZF/WR 426
YZF/WR 450
YZF/WR 250
TTR 250
YFZ 450F
GRIZZLY 660
RHINO 660
250EXC/SX
400/450 EXC/MXC/SX
525/520 EXC/MXC/SX
250XCF
525XC
Polaris Predator
Polaris 500
Honda TRX300 4X4...
TRX3004X4
Great for flying through the backwoods, or just having fun. We can help you make yours scream, yet maintain reliability
For any of our articles on how-to/installation, click here for our TRX300 4X4 tech pages
 
Thumper Racing super 400cc kit Piston kit 85mm or 86mm Big Bore Sleeve Top end gasket set Jetting Kit Heavy duty clutch springs Clutch gasket Oil filter Spark Plug Years: 1988-2000  
P/N KETRX1  
$476
 
 
Thumper Racing super 400cc kit with new cylinder Years: 1988-2000  
P/N KETRX1  
$949
 
 
Thumper Racing super 400cc kit installed in your cylinder Years: 1988-2000  
P/N KETRX1A  
$626
 
 
Thumper Racing super 400cc kit installed in your motor Years: 1988-2000  
P/N KETRX1B  
$801
 
 
85mm Piston Kit for Thumper Racing super 400cc kit Years: 1988-2000  
P/N PKTRX1  
$195
 
 
86mm Piston Kit for Thumper Racing super 400cc kit Years: 1988-2000  
P/N PKTRX2  
$195
 
 
Top end gasket kit for Thumper Racing super 400cc kit Years: 1988-2000  
P/N GATRX1  
$50
 
 
Sleeve Thumper Racing super 400cc kit Years: 1988-2000  
P/N PKTRX1A  
$89
 
 
86mm Ring Set for Thumper Racing super 400cc kit Years: 1988-2000  
P/N 3386XC  
$35
 
 
85mm Ring Set for Thumper Racing super 400cc kit Years: 1988-2000  
P/N 3347XC  
$35
 
 
Jetting kit for Thumper Racing super 400cc kit Years: 1988-2000  
P/N 818103  
$55
 
 
 
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