| Cylinder Porting |
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With today's highly developed two stroke engines, you need
experience to improve performance. Modifying the ports to higher
power levels requires larger port areas for increased
performance. Thirty years and thousands of successful race
engines has provided us with a large data base on cylinder
modifications. This in turn has led us to the development of our
own proprietary formulas for calculating the correct intake,
transfer and exhaust areas for increased power levels.
Generating the best port shapes for maximum power without
sacrificing reliability is one of our areas of expertise.
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| Trail Porting |
Our dyno developed and field tested trail porting places
priority on a wide powerband with good back up torque. For
maximum power output, the head should be machined to match the
trail porting.
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| Trail Porting, per cylinder |
LBR1020 |
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Head Machining For Trail Performance
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Machining of the cylinder head is recommended as part of the
cylinder porting package. Compression ratios and squish
clearances are matched to work with premium pump gas. A head
machined for trail porting can also be used with stock cylinders
for improved acceleration and top end power.
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Head Machining (trail), per cylinder
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LBR13006 |
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| Race Porting |
Our race porting delivers maximum power for all out competition.
Race porting gives you more power at higher RPM's than our trail
porting. Increased compression levels and tighter squish
clearances to speed up combustion at high RPM's will require the
use of high Octane Racing gasoline.
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| Race Porting, per cylinder |
LBR1021 |
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Vintage Race Porting, per cylinder
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LBR1022 |
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Head Machining (race), per cylinder
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LBR1023 |
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Case Matching - Tunnel Porting
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Intake and transfer flow can be improved by matching the
transfer passages to the case. Tunnel porting Rotary Valve and
Case Reed intake passages improves flow and increases top end
power.
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| Case Matching |
LBR1010-CM |
| Tunnel Porting |
LBR1010-TP |
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| Big Bore Kits |
"There is no substitute for cubic inches" is an old Hot Rod
saying. If performed together with necessary increase in port
area, you get more power from engagement to top end. With the
high quality Nicasil plating services now available, Big Bore
kits can be as reliable as stock cylinders. Big Bore kits
include full porting modifications and machining of the
combustion chambers and squish area to the correct compression
ratio.
| Model |
Bore Size |
Part# |
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| Polaris 700 |
Std. |
ATA810M07800 |
| Polaris 700 |
.010" |
ATA810M07825 |
| Polaris 700 |
.020" |
ATA810M07850 |
| Polaris 700 |
.030" |
ATA810M07875 |
| Polaris 700 |
.040" |
ATA810M07900 |
| Polaris 800 |
Std. |
ATA809M08500 |
| Polaris 800 |
.010" |
ATA809M08525 |
| Polaris 800 |
.020" |
ATA809M08550 |
| Polaris 800 |
.030" |
ATA809M08575 |
| Polaris 800 |
.040" |
ATA809M08600 |
| Polaris Liberty 600 Twin |
Std. |
ATASK1332 |
| Polaris Liberty 600 Twin |
.010" |
ATASK1333 |
| Polaris Liberty 600 Twin |
.020" |
ATASK1334 |
| Polaris Liberty 600 Twin |
.030" |
ATASK1335 |
| Polaris Liberty 600 Twin |
.040" |
ATASK1336 |
| Polaris Liberty 800 Twin |
Std. |
ATASK1352 |
| Polaris Liberty 800 Twin |
.020" |
ATASK1353 |
| Polaris Liberty 800 Twin |
.040" |
ATASK1354 |
| Polaris VES 800 |
Std. |
ATA809M08500 |
| Arctic Cat 900 |
Std. |
ATASK1306 |
| Arctic Cat 900 |
.010" |
ATASK1307 |
| Arctic Cat 900 |
.020" |
ATASK1308 |
| Arctic Cat 900 |
.030" |
ATASK1309 |
| Arctic Cat 900 |
.040" |
ATASK1310 |
| Arctic Cat 800 |
Std. |
ATASK1317 |
| Arctic Cat 800 |
.010" |
ATASK1318 |
| Arctic Cat 800 |
.020" |
ATASK1319 |
| Arctic Cat 800 |
.030" |
ATASK1320 |
| Arctic Cat 800 |
.040" |
ATASK1321 |
| Arctic Cat 700 |
Std. |
ATASK1277 |
| Arctic Cat 700 |
.010" |
ATASK1278 |
| Arctic Cat 700 |
.020" |
ATASK1279 |
| Arctic Cat 700 |
.030" |
ATASK1280 |
| Arctic Cat 700 |
.040" |
ATASK1281 |
| Arctic Cat 1000 |
Std. |
ATA833M08100 |
| Arctic Cat 1000 |
.010" |
ATA833M08125 |
| Arctic Cat 1000 |
.020" |
ATA833M08150 |
| Arctic Cat 1000 |
.030" |
ATA833M08175 |
| Arctic Cat 1000 |
.040" |
ATA833M08200 |
| Arctic Cat 600 Twin |
Std. |
ATASK1282 |
| Arctic Cat 600 Twin |
.010" |
ATASK1283 |
| Arctic Cat 600 Twin |
.020" |
ATASK1284 |
| Arctic Cat 600 Twin |
.030" |
ATASK1285 |
| Arctic Cat 600 Twin |
.040" |
ATASK1286 |
| Arctic Cat 500 Twin |
Std. |
ATASK1241 |
| Arctic Cat 500 Twin |
.010" |
ATASK1242 |
| Arctic Cat 500 Twin |
.020" |
ATASK1243 |
| Arctic Cat 500 Twin |
.030" |
ATASK1244 |
| Arctic Cat 500 Twin |
.040" |
ATASK1245 |
| Ski-Doo 800 Twin |
Std. |
ATASK1323 |
| Ski-Doo 800 Twin |
.020" |
ATASK1324 |
| Ski-Doo 800 Twin |
.040" |
ATASK1325 |
| Ski-Doo 700 Twin |
Std. |
ATASK1292 |
| Ski-Doo 700 Twin |
.010" |
ATASK1293 |
| Ski-Doo 700 Twin |
.020" |
ATASK1294 |
| Ski-Doo 700 Twin |
.030" |
ATASK1295 |
| Ski-Doo 700 Twin |
.040" |
ATASK1296 |
| Ski-Doo 600 Twin |
Std. |
ATASK1327 |
| Ski-Doo 600 Twin |
.010" |
ATASK1328 |
| Ski-Doo 600 Twin |
.020" |
ATASK1329 |
| Ski-Doo 600 Twin |
.030" |
ATASK1330 |
| Ski-Doo 600 Twin |
.040" |
ATASK1331 |
| Yamaha Viper/SRX 700 |
Std. |
ATASK1301 |
| Yamaha Viper/SRX 700 |
.010" |
ATASK1302 |
| Yamaha Viper/SRX 700 |
.020" |
ATASK1303 |
| Yamaha Viper/SRX 700 |
.030" |
ATASK1304 |
| Yamaha Viper/SRX 700 |
.040" |
ATASK1305 |
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Crankshaft Repair Or Modification
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When you need your crank repaired or modified with better
bearings and pin welding, we offer expert service.
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| Cylinder Boring |
Cylinder is bored to oversize and honed to correct clearance
with your piston,
(piston extra)
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| Cylinder Re-Sleeving |
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New sleeves are bored and honed to piston size. Ports are
matched to cylinders and chamfered to improved good ring
life, (piston extra)
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| Cylinder Re-Plating |
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Plated cylinders can be repaired with new Nicasil coatings.
Damaged cylinders can be repaired by welding and re-machining
before plating.
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