---
title: Blog | ProX Racing Parts | featured (2)
description: featured | Subscribe to the ProX blog for the latest info on racing parts for dirt bikes, snowmobiles, karts, ATVs, Jetskis & other powersports racing equipment. (2)
image: ?t=#keepProtocol
---

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[Rebuilding RZR Engines the Easy Way: Polaris 800 Rebuild Kits](https://blog.pro-x.com/rebuilding-rzr-engines-the-easy-way-polaris-800-rebuild-kits)

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[Yamaha YZ250FX Raced, Rebuilt & Raced Again](https://blog.pro-x.com/yamaha-yz250fx-engine-rebuild-with-prox-piston-and-rod)

,[FEATURES](https://blog.pro-x.com/topic/features) ,[Powersports](https://blog.pro-x.com/topic/powersports) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) 

[ProX Parties with the Babes! | Babes in the Dirt 7](https://blog.pro-x.com/prox-parties-with-the-babes-babes-in-the-dirt-7)

,[Powersports](https://blog.pro-x.com/topic/powersports) ,[ENGINE TECH](https://blog.pro-x.com/topic/engine-tech) ,[Tech](https://blog.pro-x.com/topic/tech) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) ,[How-To](https://blog.pro-x.com/topic/how-to) 

[Why Replacing your 4-Stroke Motorcycle's Cam Chain can Prevent Engine Failure](https://blog.pro-x.com/why-replacing-your-4-stroke-motorcycles-cam-chain-can-prevent-engine-failure)

,[NEWS](https://blog.pro-x.com/topic/news) ,[NEW PRODUCTS](https://blog.pro-x.com/topic/new-products) 

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Latest Posts

[![How To Adjust and Replace Your Motorcycle's Throttle Cable](https://blog.pro-x.com/hs-fs/hubfs/ProX/TECH/Throttle%20Cable%20Replacement/prox-throttle-cable-44.jpg?width=400&name=prox-throttle-cable-44.jpg "How To Adjust and Replace Your Motorcycle's Throttle Cable")](https://blog.pro-x.com/how-to-adjust-and-replace-your-motorcycles-throttle-cable)

,[Powersports](https://blog.pro-x.com/topic/powersports) ,[Tech](https://blog.pro-x.com/topic/tech)

## [How To Adjust and Replace Your Motorcycle's Throttle Cable](https://blog.pro-x.com/how-to-adjust-and-replace-your-motorcycles-throttle-cable)

*The throttle cable may seem like a simple part of your bike, but it can keep you from riding if not properly maintained or replaced. Read as we take you through cable maintenance..*

[READ MORE](https://blog.pro-x.com/how-to-adjust-and-replace-your-motorcycles-throttle-cable)

June 8, 2020  /  By [Paul Olesen](https://blog.pro-x.com/author/paul-olesen)

[![Standard MX vs. O-Ring: How To Choose the Proper Chain for your Bike](https://blog.pro-x.com/hs-fs/hubfs/ProX/TECH/Chains/prox_mx_chain-11.jpg?width=400&name=prox_mx_chain-11.jpg "Standard MX vs. O-Ring: How To Choose the Proper Chain for your Bike")](https://blog.pro-x.com/mx-and-o-ring-chains-explained)

,[Powersports](https://blog.pro-x.com/topic/powersports) ,[Tech](https://blog.pro-x.com/topic/tech)

## [Standard MX vs. O-Ring: How To Choose the Proper Chain for your Bike](https://blog.pro-x.com/mx-and-o-ring-chains-explained)

*Chain drive systems have been transferring power to the rear of motorcycles for nearly a century. Here we take a look at the advantages of both standard MX and O-ring chains, and..*

[READ MORE](https://blog.pro-x.com/mx-and-o-ring-chains-explained)

May 11, 2020  /  By [Kevin Bailey](https://blog.pro-x.com/author/kevin-bailey)

[![How to Rebuild the Top End in your Two-Stroke](https://blog.pro-x.com/hs-fs/hubfs/ProX/TECH/2-Stroke-Top-End/prox_2_stroke_top_end_piston-47.jpg?width=400&name=prox_2_stroke_top_end_piston-47.jpg "How to Rebuild the Top End in your Two-Stroke")](https://blog.pro-x.com/how-to-rebuild-the-top-end-in-your-two-stroke)

,[Powersports](https://blog.pro-x.com/topic/powersports) ,[ENGINE TECH](https://blog.pro-x.com/topic/engine-tech) ,[Tech](https://blog.pro-x.com/topic/tech)

## [How to Rebuild the Top End in your Two-Stroke](https://blog.pro-x.com/how-to-rebuild-the-top-end-in-your-two-stroke)

*Rebuilding a top end is a task most two-stroke owners will run into at one point or another. Here, we go over critical steps and key tips to installing a new piston and ring(s) in..*

[READ MORE](https://blog.pro-x.com/how-to-rebuild-the-top-end-in-your-two-stroke)

April 20, 2020  /  By [Paul Olesen](https://blog.pro-x.com/author/paul-olesen)

[![Complete Lineup of Performance Replacement Parts for Sherco Motorcycles from ProX](https://blog.pro-x.com/hs-fs/hubfs/ProX/NEW%20PRODUCTS/Sherco/ProX_b2b.jpg?width=400&name=ProX_b2b.jpg "Complete Lineup of Performance Replacement Parts for Sherco Motorcycles from ProX")](https://blog.pro-x.com/complete-lineup-of-performance-replacement-parts-for-sherco-motorcycles-from-prox)

,[NEWS](https://blog.pro-x.com/topic/news) ,[NEW PRODUCTS](https://blog.pro-x.com/topic/new-products) ,[Powersports](https://blog.pro-x.com/topic/powersports) ,[BIKE FEATURES](https://blog.pro-x.com/topic/bike-features)

## [Complete Lineup of Performance Replacement Parts for Sherco Motorcycles from ProX](https://blog.pro-x.com/complete-lineup-of-performance-replacement-parts-for-sherco-motorcycles-from-prox)

With a broad arsenal of model offerings and an army of top off-road racers around the world, Sherco has built a well-respected name for themselves. Participating in and winning..

[READ MORE](https://blog.pro-x.com/complete-lineup-of-performance-replacement-parts-for-sherco-motorcycles-from-prox)

March 24, 2020  /  By [Kevin Bailey](https://blog.pro-x.com/author/kevin-bailey)

[![How To Rebuild a 4-Stroke Top End in your Dirt Bike or ATV](https://blog.pro-x.com/hs-fs/hubfs/ProX/TECH/YZ450F%20Piston%20Replacement/JE7_8499-1.jpg?width=400&name=JE7_8499-1.jpg "How To Rebuild a 4-Stroke Top End in your Dirt Bike or ATV")](https://blog.pro-x.com/how-to-rebuild-a-4-stroke-top-end-in-your-dirt-bike-or-atv)

,[Powersports](https://blog.pro-x.com/topic/powersports) ,[ENGINE TECH](https://blog.pro-x.com/topic/engine-tech) ,[Tech](https://blog.pro-x.com/topic/tech) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) ,[How-To](https://blog.pro-x.com/topic/how-to)

## [How To Rebuild a 4-Stroke Top End in your Dirt Bike or ATV](https://blog.pro-x.com/how-to-rebuild-a-4-stroke-top-end-in-your-dirt-bike-or-atv)

*ProX takes you through the major parts of rebuilding a 4-stroke top end complete with step-by-step guides for each task along the way!*

[READ MORE](https://blog.pro-x.com/how-to-rebuild-a-4-stroke-top-end-in-your-dirt-bike-or-atv)

March 15, 2020  /  By [Kevin Bailey](https://blog.pro-x.com/author/kevin-bailey)

[![How To Replace the Countershaft Sprocket and Rear Sprocket on your Dirt Bike](https://blog.pro-x.com/hs-fs/hubfs/Wiseco/BIKE%20FEATURES/Husqvarna%20FX450/kevin_husky_fx_450-21.jpg?width=400&name=kevin_husky_fx_450-21.jpg "How To Replace the Countershaft Sprocket and Rear Sprocket on your Dirt Bike")](https://blog.pro-x.com/how-to-replace-the-countershaft-sprocket-and-rear-sprocket-on-your-dirt-bike)

,[Tech](https://blog.pro-x.com/topic/tech) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) ,[How-To](https://blog.pro-x.com/topic/how-to)

## [How To Replace the Countershaft Sprocket and Rear Sprocket on your Dirt Bike](https://blog.pro-x.com/how-to-replace-the-countershaft-sprocket-and-rear-sprocket-on-your-dirt-bike)

*Follow along through our guide of tips and tricks on replacing the front and rear sprockets on your dirt bike.*

[READ MORE](https://blog.pro-x.com/how-to-replace-the-countershaft-sprocket-and-rear-sprocket-on-your-dirt-bike)

March 12, 2020  /  By [Paul Olesen](https://blog.pro-x.com/author/paul-olesen)

[![ProX Pistons Provide Affordable Performance for Polaris RZR 800 Engines](https://blog.pro-x.com/hs-fs/hubfs/ProX/NEW%20PRODUCTS/ProX%20RZR%20800%20Pistons/ProX_RZR_800_Pistons-4.jpg?width=400&name=ProX_RZR_800_Pistons-4.jpg "ProX Pistons Provide Affordable Performance for Polaris RZR 800 Engines")](https://blog.pro-x.com/prox-pistons-provide-affordable-performance-for-polaris-rzr-800-engines)

,[NEWS](https://blog.pro-x.com/topic/news) ,[NEW PRODUCTS](https://blog.pro-x.com/topic/new-products) ,[Powersports](https://blog.pro-x.com/topic/powersports) ,[Tech](https://blog.pro-x.com/topic/tech) ,[UTV](https://blog.pro-x.com/topic/utv)

## [ProX Pistons Provide Affordable Performance for Polaris RZR 800 Engines](https://blog.pro-x.com/prox-pistons-provide-affordable-performance-for-polaris-rzr-800-engines)

*ProX is proudly bringing budget-friendly and reliable performance to RZR 800 engines in need of a rebuild. Manufactured by OEM suppliers with additional features added, these..*

[READ MORE](https://blog.pro-x.com/prox-pistons-provide-affordable-performance-for-polaris-rzr-800-engines)

March 10, 2020  /  By [Paul Olesen](https://blog.pro-x.com/author/paul-olesen)

[![Step-by-Step Guide to Replacing Fork Seals in your Dirt Bike](https://blog.pro-x.com/hs-fs/hubfs/ProX/TECH/Replacing%20Fork%20Seals/prox-fork-seal-replacement-51.jpg?t=1475023575990&width=400&name=prox-fork-seal-replacement-51.jpg "Step-by-Step Guide to Replacing Fork Seals in your Dirt Bike")](https://blog.pro-x.com/step-by-step-guide-to-replacing-fork-seals-in-your-dirt-bike)

,[Powersports](https://blog.pro-x.com/topic/powersports) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) ,[How-To](https://blog.pro-x.com/topic/how-to)

## [Step-by-Step Guide to Replacing Fork Seals in your Dirt Bike](https://blog.pro-x.com/step-by-step-guide-to-replacing-fork-seals-in-your-dirt-bike)

*Leaky fork seals may be seem like minor problem, but it can lead to further damage of your fork internals, and even handling and braking safety. In this guide, we go through each..*

[READ MORE](https://blog.pro-x.com/step-by-step-guide-to-replacing-fork-seals-in-your-dirt-bike)

February 25, 2020  /  By [Alex Witham](https://blog.pro-x.com/author/alex-witham)

[![ProX Honda CRF450X Rebuild: Engine Assembly](https://blog.pro-x.com/hs-fs/hubfs/ProX%20CRF450X%20Rebuild%20Bottom%20End%20Seals.jpg?width=400&name=ProX%20CRF450X%20Rebuild%20Bottom%20End%20Seals.jpg "ProX Honda CRF450X Rebuild: Engine Assembly")](https://blog.pro-x.com/prox-honda-crf450x-rebuild-engine-assembly)

,[VIDEOS](https://blog.pro-x.com/topic/videos) ,[Powersports](https://blog.pro-x.com/topic/powersports) ,[ENGINE TECH](https://blog.pro-x.com/topic/engine-tech) ,[Tech](https://blog.pro-x.com/topic/tech) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) ,[How-To](https://blog.pro-x.com/topic/how-to)

## [ProX Honda CRF450X Rebuild: Engine Assembly](https://blog.pro-x.com/prox-honda-crf450x-rebuild-engine-assembly)

*We got our hands on a well-used CRF450X engine and brought it into the shop for a complete teardown and rebuild, top to bottom-end. We documented this engine rebuild every step of..*

[READ MORE](https://blog.pro-x.com/prox-honda-crf450x-rebuild-engine-assembly)

January 31, 2020  /  By [Kevin Bailey](https://blog.pro-x.com/author/kevin-bailey)

[![ProX Honda CRF450X Rebuild: Teardown](https://blog.pro-x.com/hs-fs/hubfs/Prox20_CRF450teardown_graphic.jpg?width=400&name=Prox20_CRF450teardown_graphic.jpg "ProX Honda CRF450X Rebuild: Teardown")](https://blog.pro-x.com/maintenance/how-to/rebuild/teardown/honda/crf450x)

,[VIDEOS](https://blog.pro-x.com/topic/videos) ,[Powersports](https://blog.pro-x.com/topic/powersports) ,[ENGINE TECH](https://blog.pro-x.com/topic/engine-tech) ,[Tech](https://blog.pro-x.com/topic/tech) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) ,[How-To](https://blog.pro-x.com/topic/how-to)

## [ProX Honda CRF450X Rebuild: Teardown](https://blog.pro-x.com/maintenance/how-to/rebuild/teardown/honda/crf450x)

We got our hands on a well-used CRF450X engine and brought it into the shop for a complete teardown and rebuild, top to bottom-end. We documented this engine rebuild every step of..

[READ MORE](https://blog.pro-x.com/maintenance/how-to/rebuild/teardown/honda/crf450x)

January 16, 2020  /  By [Kevin Bailey](https://blog.pro-x.com/author/kevin-bailey)

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[How To Adjust and Replace Your Motorcycle's Throttle Cable](https://blog.pro-x.com/how-to-adjust-and-replace-your-motorcycles-throttle-cable)

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[How To Make Carburetor Jetting Adjustments on your Dirt Bike or ATV](https://blog.pro-x.com/how-to-make-carburetor-jetting-adjustments-on-your-dirt-bike)

[featured](https://blog.pro-x.com/topic/featured) [Powersports](https://blog.pro-x.com/topic/powersports) [Tech](https://blog.pro-x.com/topic/tech) [Maintenance](https://blog.pro-x.com/topic/maintenance) [How-To](https://blog.pro-x.com/topic/how-to)

[Checking and Adjusting Valves on Your Shim-Under-Bucket Style Motorcycle](https://blog.pro-x.com/checking-and-adjusting-valves-on-your-shim-under-bucket-motorcycle)

[featured](https://blog.pro-x.com/topic/featured) [Powersports](https://blog.pro-x.com/topic/powersports) [Tech](https://blog.pro-x.com/topic/tech) [Maintenance](https://blog.pro-x.com/topic/maintenance) [How-To](https://blog.pro-x.com/topic/how-to)

[12 Tips to Help Keep Your 2-Stroke Running Strong](https://blog.pro-x.com/12-tips-to-keep-your-2-stroke-running)

[featured](https://blog.pro-x.com/topic/featured) [Powersports](https://blog.pro-x.com/topic/powersports) [Maintenance](https://blog.pro-x.com/topic/maintenance) [How-To](https://blog.pro-x.com/topic/how-to)

[Step-by-Step Guide to Replacing Fork Seals in your Dirt Bike](https://blog.pro-x.com/step-by-step-guide-to-replacing-fork-seals-in-your-dirt-bike)

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