It’s all in your head! The cylinder head has the most fragile moving parts and is the number 1 source of catastrophic engine failures on a 4-stroke dirt bike or ATV. If you fix it before it destroys your engine, you’ll save a lot of money. We can fix most things for less money than the manufacturers charge for new cylinder heads.
Our Cylinder Head Porting package will improve the performance and longevity of your engine with preventive maintenance and performance parts. We use high quality American-made parts like KPM Black Diamond from California and Xceldyne valve train parts from North Carolina. Stainless steel or titanium, we can recommend the best parts for your riding demands. If you fix it before it destroys your engine, you’ll save a lot of money. We can fix most things for less money than the manufacturers charge for new cylinder heads.
The valve-train parts that we sell are geared towards these rider needs:
Bronze seats and guides replacements from $295.
Most 250F cylinders can be bored 2-3mm or 262 and 270cc. Most 450s can go 2-4mm as well. These kits include over-boring, plating, honing, and surface decking to the cylinder and a premium piston kit like Wossner, Wiseco, Vertex, JE, and CP with over-sized Cometic EST gasket kits…the standard for turboed sport compact cars. Big bores improve the throttle response and torque across the rev range and enable you to run a hotter cam to extend the mid-range to top end pull!
Hot Cams builder installation center. FREE shimming with porting, save 20% on all Hot Cams products.
Forward Motion is a Hot-Cams Builder with experience on the best set-ups of big bore cylinders with matching cams and valve spring kits, as well as piston compression ratios. Some of the Gold Series or Builder’s Cams require special grinding of the head in order to clear the cam lobes. Forward Motion offers a 20% discount on 4-stroke performance parts from Hot-Cams, Hot-Rods, and Cylinder Works.
These are the brands, models, and years for the dirt bikes and ATVs for which we offer 4-stroke cylinder head services and aftermarket accessories like big bore kits, pistons, gaskets, and Hot-Cams:
|250 SX & XC-F||2006-2015|
|350 SX & XC-F||2001-2015|
|450 SX & XC-F||2003-2015|
|525 SX & EXC||2000-2010|
Just CLICK & PRINT a copy of the Service Order Form and follow the directions on packaging your parts for shipping. All the options are listed for services, powerband choices, fuel types, spare parts, shipping methods, and payment options.
Here is a list of recommended service intervals for intermediate amateur riders quoted in engine running hours.
The average stock 250F costs $30 per engine hour to operate for a novice to intermediate racers who never hit the rev limiter. Expert amateurs? Figure $90hr. This is only a contribution to engine parts and performance machining using OEM replacement parts, not gas and oil. Pro Supercross Lites racers can expect to budget $1,000hr. The reason the price increases so dramatically is that the engine has to be built to the edge to be competitive and the racer’s demands are greater. The average hours per season of practice and racing in a 7-month season is 50 hours, that’s about $1,500 in engine maintenance per year for the average amateur racer.
The average stock 450F costs $20 per engine hour to operate for beginner and intermediate riders who never hit the rev limiter. Expert amateurs? Figure $75hr. This is only a contribution to engine parts and performance machining using OEM replacement parts, not gas and oil.