Racing Engines - JRPW (2022)

JRPW Signature Series Pro Clone Engine Package

Racing Engines - JRPW (1)

This is the ultimate in stock class clone engine Horsepower. JRPW has made the investment in research, development, and machinery to insure the highest level of performance. JRPW uses its state of the art machine shop to precisely machine and massage the hand selected internals to the razor’s edge. The JRPW “Attack Series” cylinder head and carb package tops it off. Here at JRPW, we believe in walking all over the line set by the technical regulations, but not across it. Every engine is painstakingly assembled, checked, and double checked to verify every aspect is perfect, then we test and tune on the dyno to quality control. This package is complete with all linkages, sleeved header/ muffler assembly, chain guard, all hardware. We only offer this top level package, nothing else is acceptable. The blower housing and recoil is custom powder coated in your choice of color, standard. JRPW engines set the bar in performance as well as appearance.

Racing Engines - JRPW (2)

JRPW Signature Series Pro Open F92

This is the Big Brother of our Pro Open engine. Same internals and parts, except the block is machined and sleeved to accept a 3” piston. The Honda block is standard equipment here. There is no substitute for cubic inches, and we take full advantage. Gain is about 1hp peak, with increased torque and acceleration. Feel the earth move as you wrestle with this beast.

Color Choice on Engine Shroud


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Racing Engines - JRPW (3)

JRPW Pro Open OHV w/ Honda Block

Beginning with the GX 200 Honda Block engine, we completely gut the case and precision overbore the cylinder WAY oversize. The case is machined to accept all the high performance internals we use. The block is welded and braced to add additional support. The head is our fully modified Level 10 with 32mm and 28mm stainless valves and topped with dual valve springs and hp retainers. Compression ratio is calculated and parts are machined to optimize performance. Roller shaft rockers finish the head assembly. Billet crankshaft, billet rod, forged piston, billet crankcase cover, and a billet flywheel are all standard equipment. The package is completed with a blueprinted Mikuni carb, as well as the header/ muffler assembly. This one is definitely not for the faint at heart, as this engine makes in excess of 34 hp. Practice your grip, you will need it to keep this monster under control. This bore and stroke combination is 14.31 cubic inches.


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Racing Engines - JRPW (4)

Briggs LO206 JRPW Version

JRPW Race Prepared LO206. This engine gets the JRPW treatment. We expertly perform the valve job, check and set the carb, set the valve lash to our specs, bolt on all the goodies and dyno test and tune. This engine is 100% legal, but we take full advantage of tolerances and tuning to make big gains over factory stock. Ready to bolt on minus clutch. If a colored slide is required for your division, please let us know. Slide and slide lock is a $25 charge.


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Racing Engines - JRPW (5)

JRPW Signature Series BP Clone Engine

This Blueprinted engine is built to the original AKRA BP class rules. Based upon our highly successful Pro Clone package, we take full advantage of the additional upgrades the rules allow. Includes billet rod, improved camshaft and heavy duty valve springs. Topped off with our Attack Series .625 carb, this engines package is ready to go.


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Racing Engines - JRPW (6)

JRPW SSA Stock Appearing Clone

JRPW has a supply of these special small block, 3” bore engines. Prepared in the JRPW way, these engines have a special “Attack Series” Level 10 head, “Attack Series” .690 carb, roller rockers, HD pushrods, special cam grind, and all the bolt-ons necessary to make it race ready. JRPW custom machines the internal parts to make this package a reality. Hands down, the most powerful stock appearing for the price anywhere. Choose a color, and give us a call. Further upgrades are possible, contact us for details and pricing.

Alky or Gas

Color Choice on Engine Shroud

(Video) JRPW Signature Series Pro Open OHV making a dyno run


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Racing Engines - JRPW (7)

JRPW Signature Series Level 5 Modified Engine

For the modified racer wanting a lot of HP at a lower cost, this is a package that makes excellent power and great reliability.


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Racing Engines - JRPW (8)

JRPW Limited Modified Animal

WKA/ AKRA/ NKA legal for the Limited Modified class. Ported and polished, Tillotson carb, long rod, Wiseco piston, all part of the package. Includes header assembly and chain guard. Powder coating in your choice of color is included at no charge


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Racing Engines - JRPW (9)

JRPW Signature Series Mini Mod Engine

For the budget racer wanting a reliable engine package that packs a mean punch, this is it.


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Racing Engines - JRPW (10)

Blueprinted Stock Predator Engine

Blueprinted Hemi Predator Racing Engine. This package is built around the rules packages that require the stock flywheel, stock airbag and stock components. This package includes top plate, fuel pump, weenie pipe, muffler, and chain guard. Please submit your particular rules set to make sure engine is prepared to your rules.


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Racing Engines - JRPW (11)

JRPW Pro Open Animal

For the Racers wanting the power and Speed of a JRPW Open but using the Briggs Animal engine as a base, this is for you. The best of everything is here, Mikuni carb, billet components, and expert craftsmanship are front and center, and the result is nothing short of incredible. Bored, stroked, and machined the JRPW way. It’s ready to add liquids and a clutch, the rest is included.

Gas or Alky Fuel

Color Choice on Engine Sheetmetal


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(Video) Valve Seat Technology at JRPW

Racing Engines - JRPW (12)

JRPW Signature Series Stock Animal

This is the Briggs and Stratton Overhead valve racing engine. Fully blueprinted, ready to perform. We use our years of experience and expertise, coupled with our machining capability to transform this engine from ordinary to extraordinary. Standard procedure here at JRPW is to sort and hand select each piece we use, it is the only way we can achieve the results we both desire. To the limits, thats the way we do it every day. Each engine includes all throttle linkages, sleeved header/ muffler assembly and chain guard. Choose your color, and hold on, we are ready.

Options: Unrestricted, Gold Plate, Blue Plate, Purple Plate


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Signature Series Dual Bearing Flathead

Our quality machine work, testing, and experience set this engine apart from the competition. This engine is fully machined, with replacement valve seats and full length valve guides precision honed to size. We weld the lifter bore, angle deck the cylinder, and port and polish for max airflow. We align bore the cylinder and finish hone to exacting clearance. The valve seats are perfectly finished with our Rottler seat and guide machine. We add a pair of blueprinted valves, a pair of perfectly matched valve springs, and top off the cylinder with one of our machined heads. We complete the package by adding one of our signature “Attack Series Carbs”, with its precision machined body, offset throttle shaft, and hand picked internal parts to insure the highest possible airflow. Included in this are a pair of billet lifters, billet rod, and all the go fast goodies we can legally fit inside this powerhouse. Each piece is hand selected to insure maximum horsepower. This engine comes standard with our billet header support, oil vent kit, and a lightweight filter adapter. Restricted class engines also include a max-size restrictor plate. Dyno tested and tuned to meet our highest standards of quality, this engine is ready to bolt on and win…. just add oil and fuel. Powder coating is also included at no additional charge.

Racing Engines - JRPW (13)

JRPW Signature Series Stock Appearing

This engine uses the same internals and machine work as our Signature Series Open Modified, just in a stock appearing format. The best of the best, its all there. Topped off with one of our killer 690 Attack Series Carbs. As with all JRPW packages, it comes complete, powder coated, and ready to race, including all bolt ons and accessories.Clone block is used in this build. Honda block is available at an additional cost.

Alky or Gas

Color Choice on Engine Shroud


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Engine Kits

Racing Engines - JRPW (14)

Mikuni Blueprinted 28MM Carb Kit Clone

JRPW Mikuni Flat Slide 28MM carb kit for the Clone. Comes with intake, filter adapter, and all necessary linkages. Specify Alky or Gas


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Racing Engines - JRPW (15)

JRPW Pro Clone Kit AKRA

JRPW Pro Clone Engine Kit is prepared, machined and ready to assemble. We have done all the machine work, gathered all the matching pieces, and put into a kit form. This part number is for the AKRA version with the ported cylinder head. Please specify division.


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(Video) Open modified predator 212 hemi build , racing engine , best mini bike or go kart engine build

Racing Engines - JRPW (16)

JRPW Pro Upgrade Kit AKRA

JRPW Attack Series Pro Upgrade kit with AKRA ported head and camshaft. Includes JRPW Attack Series head and carb, gaskets, matched insulator, and timing key. Specify division as well as flywheel model you are using to insure optimal parts choice.


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JRPW Big Block Level 10 Cylinder Head

Racing Engines - JRPW (17)
Racing Engines - JRPW (18)
Racing Engines - JRPW (19)

JRPW is proud to introduce their cylinder heads to the big block market. Same expert craftsmanship as our small block heads, just on a larger scale. Fully machined and assembled, this beauty has a 40mm intake valve and a 33 mm exhaust. Includes dual valve springs, retainers and valve locks.$409.95

Racing Engines - JRPW (20)

JRPW Attack Series Level 5 Head

JRPW Attack Series Level 5 cylinder head package. 28.5mm intake valve, 25mm exhaust. Fully machined in house. Ported and polished, includes our Signature 3 angle valve job. Assembled with dual valve springs, HD retainers and keepers, it ready to bolt on, add rocker arms and go.


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JRPW Clone Cylinder Head Level 5

For the smaller modified engines or the stock appearing engines with smaller carbs, this may be the best choice. An oversize intake valve seat is installed along with a 28.5mm stainless valve. Exhaust is a stock diameter stainless valve. Professionally ported and blended, it comes complete with spring package of your choosing, HD retainers and valve locks. $265.00

JRPW Clone Cylinder Head Level 5X

Racing Engines - JRPW (21)

This head is a special model with factory 27/25mm valve seats. JRPW performs their magic to make this a significant upgrade, and tops it off with the valve job to make it all work. The head is fully assembled with stainless valves, your choice of springs, and hd retainers and locks. $235.00

JRPW Open Animal Cylinder Head

Racing Engines - JRPW (22)

Beginning with the the improved Briggs RT-1 casting, we add the JRPW touch. Stock seats are removed and the pockets are machined to accept 1.25”/ 1.12” machined stainless valves. Ported, blended, and decked to our highest of standards, no stones are left unturned in our quest to provide you with the most possible HP. Includes springs and HD retainers, ready to go. $360.00

JRPW Open Clone Cylinder Head Level 10

When all out HP is the goal, this is the only choice. Precision machined with 32/28mm machined stainless valves. Valve bowls are machined and hand blended into the runners. As with all our heads, seats are precision machined on our state of the art Rottler Seat and Guide machine, leaving a perfect 3 angle seat. Air, air, and more air, thats what this head is all about. Decked out and ready to bolt on, includes dual springs, HD retainers and locks. $295.00

Racing Engines - JRPW (23)

3″ Welded and Braced Clone Block

3″ welded and braced clone block. Welded and braced for strength. Sleeved and diamond finished to exact clearance for 2.990 piston.


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(Video) Fired up the All Billet Animal

Racing Engines - JRPW (24)

Welded, Braced, and Bored Honda Block

Welded and braced genuine Honda block. Welded in house to add strength and rigidity. Cylinder is bored and diamond finished to exact clearance. Bore sizes available up to 2.835


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Racing Engines - JRPW (25)

Blueprinted Clone Carb

JRPW Blueprinted Carb for the Stock Clone Classes. Custom prepared to match the needs of your division.


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JRPW 390 BP Carb

Racing Engines - JRPW (26)

JRPW machines the internal components and properly jets the carb for your choice of fuel. Same as above but with stock bore size. $109.95

Racing Engines - JRPW (27)

JRPW Attack Series 390 MAXX Carb Gasoline

JRPW Attack Series 390 MAXX Carb for Gasoline. Bored to .933, machined butterfly and throttle shaft, and race prepared.


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Racing Engines - JRPW (28)

JRPW .650 Stock Appearing Clone Carb

JRPW Attack Series .650 Stock Appearing Carb. Available in Gas or Alky


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Racing Engines - JRPW (29)

JRPW .690 Stock Appearing Clone Carb

JRPW Attack Series .690 Stock Appearing Carb. Available in Gas or Alky



1. Head Gasket Replacement, Box Stock Clone Engine
(JRPW Racing, Inc)
2. Carb Flushing and Care
(JRPW Racing, Inc)
3. JRPW, a look back at 2018
(JRPW Racing, Inc)
4. JRPW Shop tour part 1
(JRPW Racing, Inc)
5. JRPW Race Shop Tour Part 2
(JRPW Racing, Inc)
6. Open billet animal
(Edward Downing)

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