Hop Up Kits

Stage 1 Hop Up Kit for GX340-GX390, 420 Predator, and 13/15hp OHV Basic kit for improving the performance of GX390s, 420 Predators, 440 Duromax, and 13/15hp (440-460cc) OHVs. Simple to install, you can expect significant performance increases! Kit Includes: • Race/Open Air Filter & Adapter • Heavy Duty Valve Springs • Offset Timing Key • Jet for Application (*see notes below*) • Optional Ignition Coil • Optional Twister Camshaft • Optional Header/Exhaust *Note: UT2 series Hondas (2012 & up) have rev limited coils and will require a new coil to exceed 4000rpm. The UT2 coils (4 wire) can only be used with stock flywheels or 6693 ARC flywheels. If using any other flywheels, you must run a UT1 style coil (single wire). Most 390 “Clone”, 420s, and 460s have UT1 style coils already (however, some Lifans and 420s have a rev-limited digital ignition). The correct jets must be selected for the application. If unsure, we recommend you check your STOCK main. If stock main is a: • #92-97, use a UT1 kit • #98-102, use a hemi kit • >102, use a UT2 kit Manufacturers have been known to use different jets on the same models, so it is important to know the stock jet size! *Picture is for reference only and may show optional parts. See above description for actual content. Header not included unless specified. Filter should be sprayed with a K&N type oil, especially in dirt applications. Oil not included - click here.

Stage 1 Hop Up Kit for GX200 and 6.5 OHV Basic kit for improving the performance of GX200s and 6.5 OHV clone engines. Simple to install, you can expect significant performance increases. Approximately 10+ HP for 6.5s and GX200s. This kit will not fit Harbor Freight 212 Predator. Please see our Predator kits for those applications. Kit Includes: • Race/Open Air Filter & Adapter • Choke Bracket • Main Jet • Upgraded Valve Springs (22lb) • Valve Cover Gasket • Choice of Small Fan or Aluminum Flywheel • Offset Timing Key • Optional Header/Exhaust *Note: Picture is for reference only and may show optional parts. See above description for actual content. Parts may be different than pictures, depending on which motor and options are selected. (When selecting the Aluminum flywheel, the small fan is not included nor needed). Head gasket is not included. This kit is an NR Racing recommendation. Kit cannot be modified or changed. However, all parts are available individually if you would like a customized kit. Use the above contents as a guideline! Filter should be sprayed with a K&N type oil, especially in dirt applications. Oil not included - click here. Aluminum flywheel recommended. Stock flywheels, especially "clones", are prone to failure and are very dangerous! WARNING: Header/pipe should be supported with a bracket/brace to either the frame or the engine; otherwise, pipe may fracture or break.

Stage 2 Hop Up Kit for GX200 and 6.5 OHV For those looking to get the maximum performance on a budget, we offer our Stage 2 kit. We only use genuine Honda components where possible to improve reliability and power. This is the same as our Stage 1 kit, but with the addition of a bored carb and a performance cam to produce a solid 12+ HP on GX200s. Includes: • Race/Open Air Filter & Adapter • Choke Bracket • 22lb Springs (Spring choice depends on availability) • Aluminum Flywheel • Timing Key • Mod 2 Camshaft • Bored .650 Performance Carb (Gas) • Carb Gasket • Valve Cover Gasket • Case Gasket • Optional Header/Exhaust *Note: This kit will not fit Harbor Freight 212 (Predator) engines. Please see our Predator Kits for those applications. Filter should be sprayed with K&N type oil, especially in dirt applications. Oil not included - click here. Pictures are for reference only. See description for actual content. Parts may be different than pictures, depending on which motor & options are selected. WARNING: Optional header/pipe should be supported with a bracket/brace to either the frame or the engine; otherwise, pipe may fracture or break.

Stage 4 Hop Up Kit for 212 Hemi Predator For serious engine builders looking for great power and good reliability, we offer our Stage 4 kit! This package is similar to our Stage 3, but adds a ported and milled hemi head, stainless steel valves, billet rockers, and a great all-around camshaft package. Allows up to 20hp or more! Kit Includes: • Ported and Milled Head • Approximately 10:1 Compression Ratio for Use with Pump Gas • Stainless Steel, High-Flow 28mm Intake and 25mm Exhaust Valves • 37lb Springs • 1.2 Ratio Billet Steel Rocker Arms • Chrome Moly Pushrods • 280-0611 Camshaft • Stud Kit • Lash Caps • Long Billet Rod (+.020") • Complete Gasket Kit • Carburetor Option • Optional Flywheel • Optional HOT Coil *Note: This kit will not fit non-hemi Predator engines. Please see our non-hemi kits for those applications. These kits are intended for experienced engine builders. Some clearancing, fitting, and other engine building "tricks" may be necessary. Filter should be sprayed with K&N type oil, especially for dirt applications. Oil not included - click here. Picture is for reference only. Actual content is based on above description and selections. The flywheel shown is optional. Aluminum flywheel required. Stock flywheels are prone to failure and are very dangerous! Due to the head work involved in this kit, please allow 1 week before shipping.

Small Engine Mud Motor Hop-Up Kit with Exhaust Special kit designed to improve the performance of Honda GX200, 6.5 OHV Clone engines, 212/224 Predators, and 208 Duromax engines used in marine applications, including mud motors, mud skippers, long shafts, Mokais, etc.. Simple to install, you can expect significance performance increases, especially in the mid-to-upper RPM range. This works best when operated at 4800-5000rpm. Approximately 11+ HP on GX200/Clone engines. Mud Motor Hop-Up Kit Includes: • Race/Open Air Filter and Composite Filter Adapter • Air Filter Sock (to keep water out) • .625 Bored Genuine Honda Carburetor • Offset Timing Key (adds 4 degrees) • New Throttle Linkage (Sox) • Upgraded Valve Springs (18 or 22lb) • Small Fan (for increased RPM) • Valve Cover and Carb Gaskets • Mud Motor Exhaust System (header and muffler) *Notes: • Filter should be sprayed with K&N type oil. Oil not included - click here. • Pictures are for reference only. See description for actual content. Parts may be different than pictures, depending on which motor and options are selected. • Aluminum or Honda flywheels are recommended. Stock flywheels are prone to failure and can be very dangerous. • This kit is an NR Racing recommendation. The kit cannot be modified or changed. However, all parts are sold individually if you would like to build a customized kit. Use the above contents as your guideline.

Stage 1 Hop Up Kit for 212 Hemi Predator Basic kit for improving the performance of 212 Hemi Predator engines. Simple to install, you can expect significant performance increases. Approximately 10+ HP. Kit Includes: • Race/Open Air Filter & Adapter • Choke Bracket • Correct Jet for Application (*see notes below*) • Upgraded Valve Springs (18 or 22lb) • Valve Cover Gasket • Choice of Small Fan or Aluminum Flywheel • Offset Timing Key • Optional Header/Exhaust Manufacturers have been known to use different jets on the same models, so it is important to know the stock jet size! *Picture is for reference only and may show optional parts. See above description for actual content. Parts may be different than pictures, depending on which motor and options are selected. (When selecting the aluminum flywheel, the small fan is not included nor needed). Head gasket is not included. Filter should be sprayed with a K&N type oil, especially in dirt applications. Oil not included - click here. Aluminum or Honda flywheel recommended. Stock flywheels, especially "clones", are prone to failure and are very dangerous! WARNING: Header/pipe should be supported with a bracket/brace to either the frame or the engine; otherwise, pipe may fracture or break.

Stage 2 Hop Up Kit for 212 Hemi Predator For those looking to get maximum performance without opening up the case, we offer our Stage 2 kit. This is the same as our Stage 1 kit, but with the addition of a bored carb and a performance cam to produce 12+ HP. Includes • Race/Open Air Filter & Adapter • Choke Bracket • 18 or 22lb Springs (Spring choice depends on availability) • Aluminum Flywheel • Timing Key • Mod 2 Camshaft • Bored .650 Performance Carb (Gas) • Carb Gasket • Valve Cover Gasket • Optional Header/Exhaust *Note: This kit fits the Hemi Predator engines (Model 60363 [210FA] that came with cast aluminum valve cover. This does not fit Non-Hemi Predator engines (Model 69730 [R210] that came with stamped steel valve cover). Pictures are for reference only. See description for actual content. Parts may be different than pictures, depending on which motor and options are selected. (When selecting the billet flywheel, the small fan and offset key are not included nor are needed.) WARNING: Optional header/pipe should be supported with a bracket/brace to either the frame or the engine; otherwise, pipe may fracture or break.

Stage 3 Hop Up Kit for 212 Hemi Predators Now you are getting serious! A step up from our Stage 2 kit, we add a racing camshaft, a 22mm carburetor, and a billet rod. This kit produces 13-15+ HP. Includes: • 22mm Mikuni Style Carb Kit • Choice of Cam (Rattlesnake or NR Racing's 252-0607) • 18lb or 26lb Springs (Depending on Cam Selection) • Aluminum Flywheel • Offset Timing Key • Chrome Moly Pushrods (With 252 Cam Selection) • Billet Rod (+.020") • All Needed Gaskets (Head Gasket not Included) • Optional Header/Exhaust --Camshaft Choices-- 252 Cam Package Includes: Cam, 26lb Springs, and Chrome Moly Pushrods. Rattlesnake Cam Package Includes: Cam and 18lb Springs ONLY. *Note: To get maximum power, head should be ported and/or milled. Filter should be sprayed with a K&N type oil, especially for dirt applications. Oil is not included - click here. This kit fits hemi Predators ONLY (Model 60363 [210FA] with the case aluminum valve cover). It will not work with non-hemi Predators (Model 69730 [R210] with the stamped steel valve cover). Pictures are for reference only. See description above for actual content. Parts may differ from picture, depending on which options are selected. WARNING: Optional header/pipe should be supported with a bracket or brace either to the engine or the frame; otherwise, pipe may fracture or break.