On this week’s 4-Stroke Project Bike Spotlight we give you a sneak peek at our LA Sleeve Honda CRF450RX off-road build that we just finished up. The 4-Stroke Hardware section highlights products from Pro Circuit and Seal Saver that are used on the build. Thumper Theater features three project builds and a 450cc off-road shootout you don’t want to miss! Look for an exclusive link to “Project Grandpa” at the bottom of this post.


We built this CRF450RX with Mark from LA Sleeve as an all around machine. Something you can take on a trail ride with your buddies one weekend and then race a grand prix or desert race the next. This was accomplished using bolt-on items from Pro Circuit, Seal Savers, Cycra, Supersprox, IMS, Dunlop, TM Designworks and more.

Pro Circuit stainless-steel and aluminum T-6 dual exhaust systems are designed to improve performance throughout the power curve and come with removable forestry service approved spark arrestor screens.

Cycra Full Coverage plastic skid plates provide tons of protection from the elements, include all mounting hardware and are available in a variety of colors. We also added matching red Cycra hand guards.

GPR Stabilizer Version-4 Pro-Kits are now available for most popular 4-Stroke models. Pro-Kits include the billet top-clamp along with V4 damper mounted under the bar and oversized bar mounts. We mounted ODI CFT bars for some added damping and lock-on grips. 

LA Sleeve does a variety of 4-Stroke engine work and repair. Our CRF450RX had some minor modifications performed on the head but they can build complete engines.  

We decided to use an SX style rear chain guide from TM Designworks. This gives us wear protection and increased strength all in a compact package. 

Precision Concepts took care of our suspension needs and we added some Seal Savers to the front fork tubes. An IMS oversized tank is a must for most off-road builds and are available in a screw cap or quick dump design. We also used Dunlop AT-81 tires and Nitro Mousse foam inserts to eliminate the possibility of getting a flat. 



The SealSavers Fork Covers are a durable and washable fork cover that will not affect your fork damping or preload. SealSavers Zip-On’s design that allows for quick and easy installation and cleaning without having to remove your forks from the triple clamps
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The T-6 Stainless Steel Dual Exhaust System offers maximum performance and is constructed of stainless steel throughout the head pipe, y-collector mid pipe and end-caps while the canisters are aluminum. The T-6 is perfect for any closed-course or off-road racer looking for improved performance, durability and a professional look. More features offered by the T-6 is the ability to meet AMA amateur racing sound requirements and that it comes equipped with United States Forest Service (USFS) approved spark arrestors making it easy to alternate between off-road and closed-course racing.


If you like the build featured on this week’s 4-Stroke Project Bike Spotlight check out this Yamaha YZ450F we built with Dubya USA. Click the image below.


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