Yamaha Blaster Front Suspension Part Numbers: Complete Guide

The Yamaha Blaster (YFS200) is a popular sport ATV known for its lightweight chassis and peppy two-stroke engine. A common upgrade or maintenance need involves the front suspension. Whether you're rebuilding worn-out forks, swapping springs for better handling, or replacing damaged components, having the correct part numbers is essential. This guide lists OEM part numbers for the Yamaha Blaster front suspension, plus compatible aftermarket options to help you order exactly what you need.

OEM Yamaha Blaster Front Fork Components

The Yamaha Blaster uses conventional telescopic front forks (non-inverted) from 1988 to 2006 (model years YFS200). The fork tubes measure 30mm in diameter. Below are the key OEM part numbers for stock front suspension parts.

Inner and Outer Fork Tubes

• Outer Fork Tube (Right): 4J8-23110-00-00
• Outer Fork Tube (Left): 4J8-23120-00-00
• Inner Fork Tube (Lower case, right): 4J8-23111-00-00
• Inner Fork Tube (Lower case, left): 4J8-23121-00-00

Note: These part numbers cover the complete tube assemblies. For bent or scratched tubes, you can order individual lower tubes, but often it's more cost-effective to replace the entire fork leg.

Fork Seals and Dust Wipers

• Front Fork Seal (30x40x10.5): 4J8-23145-00-00
• Dust Wiper: 4J8-23153-00-00

Replacing fork seals is common due to leaking or age. A standard 30mm seal fits, but OEM ensures correct fitment. Use two seals per fork leg.

Fork Springs

• Front Fork Spring (stock rate): 4J8-23141-00-00 Stock spring rate is approximately 0.38 kg/mm. For heavier riders or aggressive riding, aftermarket springs are recommended.

Fork Oil and Settings

• Recommended fork oil: Yamaha Suspension Oil 10W (part number ACC-12380-02-00) or equivalent.
• Oil volume: 180-190 ml per leg (depending on year; check service manual).
• Oil level: 120mm from top of tube with spring removed, fork fully compressed.

Using the correct oil viscosity and volume is critical for consistent damping. Always bleed air after assembly.

Other Internal Parts

• Fork Cap: 4J8-23181-00-00 (right) and 4J8-23182-00-00 (left)
• Rebound Spring: 4J8-23142-00-00 (small spring inside damper rod)
• Damper Rod: 4J8-23140-00-00 (fits both sides)
• Backup Ring: 4J8-23146-00-00 (sits behind seal)
• Circlip: 4J8-23148-00-00 (retains seal)

If you're doing a full rebuild, ordering all seals, springs, and bushings together saves time.

Front Suspension Steering and Linkage Parts

The Blaster uses twin A-arm front suspension with ball joints and tie rods. These parts often wear out and cause play or poor handling.

Upper and Lower Ball Joints

• Upper Ball Joint: 4J8-23570-00-00
• Lower Ball Joint: 4J8-23580-00-00

Ball joints are pressed into the A-arms. Replace in pairs. Aftermarket options (e.g., Moog or aftermarket brands) exist but require careful fitment; OEM is recommended for direct replacement.

Tie Rod Ends

• Tie Rod End (inner): 4J8-23790-00-00
• Tie Rod End (outer): 4J8-23700-00-00
• Tie Rod Tube (adjustable): 4J8-23710-00-00

Check for looseness. Tie rod ends can be replaced individually. The adjustable tube allows toe setting.

A-Arms (Control Arms)

• Upper A-Arm (right): 4J8-23510-00-00
• Upper A-Arm (left): 4J8-23520-00-00
• Lower A-Arm (right): 4J8-23550-00-00
• Lower A-Arm (left): 4J8-23560-00-00

Aftermarket tubular A-arms are popular for improved geometry and strength, but OEM part numbers are listed for reference.

Bushings and Sleeves for A-Arms

• Upper A-Arm Bushing (front): 4J8-23515-00-00
• Upper A-Arm Bushing (rear): 4J8-23516-00-00
• Lower A-Arm Bushing (front): 4J8-23555-00-00
• Lower A-Arm Bushing (rear): 4J8-23556-00-00
• Sleeve (for bushings): 4J8-23517-00-00

These press-in bushings wear over time. Replacing them tightens up the front end.

Shocks (Struts)

The Blaster has coilover spring shocks separate from the fork tubes. Each side uses a single shock.

• Front Shock (complete): 4J8-23610-00-00 (right) and 4J8-23620-00-00 (left)
• Shock Lower Bushing: 4J8-23615-00-00
• Shock Upper Bushing: 4J8-23616-00-00

Stock shocks are non-adjustable except for spring preload. Many upgrade to gas-charged aftermarket units.

Steering Stem and Components

• Steering Stem: 4J8-23410-00-00
• Steering Stem Bearing (upper): 4J8-23421-00-00
• Steering Stem Bearing (lower): 4J8-23422-00-00
• Steering Stem Nut: 4J8-23431-00-00

Worn steering bearings cause a notch or binding. Replace as a set.

Upgrading Front Suspension: Aftermarket Part Numbers

Many riders improve handling with aftermarket springs, shocks, or entire front ends. Here are popular upgrades with product numbers to search for.

Fork Springs

• Cannon Racecraft: Yamaha Blaster 30mm fork springs (single rate or progressive). Weights: 0.40-0.45 kg/mm recommended for 180-220 lb rider.
• Race Tech: FRPS series springs (part # FRPS-BLST01 for standard).
• ProCycle: Stock rate replacements (similar to OEM).

Aftermarket springs are sold individually; always buy a pair. Check free length vs. stock (stock is 470mm).

Fork Cartridge Emulators

• Race Tech Gold Valve Emulators (GVE): Part # GVE-3450 for 30mm forks (requires drilling damper rods).
• Racetech Standard Emulator Kit: PN 7700-01. Included with spring kits.

Emulators improve low-speed damping control dramatically.

Aftermarket Complete Shock Absorbers

• Works Performance Ultra-Cross: Shock part number may vary; note model YFS200.
• PEP (Progressive Engineering): Yamaha Blaster front shocks (custom valving).
• Elka Stage 3: Fits Blaster with reservoir.
• YFZ450 conversion: Some use 2004+ YFZ450 shocks with minor modifications, but that is beyond parts list scope.

Aftermarket shocks often require you to specify rider weight and terrain.

Aftermarket A-Arms

• ASR (American Star Racing): +2 or +3 length tubular A-arms. Part specific to Blaster.
• SMC (Steel Moose Racing): Limited production.
• Alba Action Sports: +1 stock replacements.

When upgrading A-arms, you may also need longer shocks, tie rods, and brake lines.

Complete Front Suspension Kits

• Full flight suspension packages from places like GT Thunder (GT Thunder Blaster front end kit) include shocks, springs, and hardware.

For most DIYers, focusing on fresh OEM bushings, seals, and springs gives the best cost-to-benefit ratio.

Where to Find Parts and Verify Numbers

OEM part numbers are valid for Yamaha dealerships (online or local) and aftermarket suppliers like Partzilla, Rocky Mountain ATV/MC, or BikeBandit. Always cross-reference your model year (1988-2006) because minor revisions occurred (e.g., 2003+ had different fork caps). Check the parts diagram for your specific year.

Tips for ordering:

• Search using the full 13-character part number (including dashes).
• Verify supersessions: Yamaha sometimes updates part numbers (e.g., 4J8-23145-00-00 replaced older 4J8-23145-10-00).
• If ordering aftermarket, confirm compatibility with stock Blaster dimensions.
• For suspension rebuilds, buy seal kits that include dust wipers and O-rings (All Balls Racing #56-1015 for 30mm fork).

Final Recommendation

For a stock rebuild, spend about $100-150 on OEM seals, bushings, and springs. This restores factory performance. If you ride aggressively or weigh over 200 lbs, upgrade to aftermarket fork springs (0.40-0.45 kg/mm) and consider Race Tech emulators. Always replace all wear items (bushings, seals, ball joints) at the same time to avoid chasing problems later. Use the part numbers above to order confidently and get back to riding with a tight, reliable front end.