Tech Department
Customer service has always been a core value at JR Race Car. We are here to support the junior community with advice and suggestions about all makes and models. Our tech line is open Mon - Thu 8am-5pm and Fri 8am-noon.
Check back often for new and updated tech articles. Don't forget to print them off and take them to the track.
Engine Documents
- Engine Brakein Guide
- Rebuild or new engine ware in procedure. These are recommendations for JR Brand Engines.
- Carburetor Tuning
- Carburetor tuning indicators guide. A quick chart the suggest carburetor adjustments.
- Round Fuel Pump Routing Diagram
- The Mikuni round fuel pump is not as simple to install as other pumps. This is a guide for plumbing the round fuel pump.
- Timing 101
- A how to guide to setting timing for analog ignition coils without a flywheel key.
- Kill Switch Wiring
- Proper engine cut off is a critical safety component of any dragster. This is a guide to setting up both electrical and manual engine kill switches.
- Titan Exploded Parts
- Engine basics, a diagram showing all the parts and components to a Titan engine. The basic layout is consistent with all flat head engines.
- Engine Rebuild Instructions
- Please print this form out and send it in the box with your engine for rebuild.
- Raptor
- Engine Tuning and gearing suggestions for a Rater Engine
- ZR (Stage 8&9)
- Engine Tuning guide with gearing and clutching for ZR3 Engines
- ZR4 (all bores)
- ZR4 Tuning and gearing guide
- Titan (all bores)
- Titan Engine setup guide
Shockwave Clutch Documents
- Shockwave Maintenance Guide
- Disassembly and reassembly instructions for the Shockwave Clutch
- Reverse Driven Maintenance Guide
- Disassembly and reassembly instruction for Reverse Driven
- Alignment Guide
- Belt alignment diagram for Shockwave and Shockwave OD clutch
- Clutch Vocabulary Sheet
- A peace and part guide to the Shockwave clutch.
- Shockwave Tuning Chart
- Weight and spring combinations for the Shockwave family of clutches.
- C-4 Flyweight
- History and application for the C-4 style flyweight.
- C-14 Flyweight
- Application of the C-14 style weight developed for outlaw racing.
- H-1 Flyweight
- History and application of the overdrive H-1 style flyweight.
- C-15 Flyweight
- Application and history of the early outlaw flyweight C-15
- C-2 Flyweight
- History and application of the original overdrive C-2 style flyweight.
Chassis Documents
- Hercules Axle Assembly Guide
- Step by step guide to JR Pro axle setup and installation.
- Hercules Brake Assembly Guide
- How to guide for installing the JR PRO floating caliper on the Hercules chassis.
- Beadlock Installation Instructions
- Torque spec and setup information on JR Beacklock wheels.
- Center Pull Motor Plate Guide
- Exploded center pull motor plate view with part list.
- Ballast Guide
- Chassis ballets, where to pack on the pounds to effect tracking, reaction time, and more.
- Tire Comparison Guide
- Side by side comparison guide for front and rear tires. Actual measurements and sizing.
