Torque Specs for the 1987 Honda XR100
Shop parts for a 1987 Honda XR100 Dirt Bike.
The 1987 Honda XR100 is a mid-production classic from Honda's XR trail bike era, featuring the same proven 99cc air-cooled OHC four-stroke engine and five-speed gearbox that defines the XR100 lineup. Whether you're doing routine maintenance or a more thorough restoration, these torque specifications apply directly to the 1987 XR100 across all key service categories.
Wheels & Final Drive
Chain and sprocket maintenance is among the most frequent service tasks on the 1987 XR100. The rear axle carries a higher torque requirement than the front due to chain tension loading—verify the correct spec before torquing each wheel. Re-torque the rear axle nut and lock nuts after every chain adjustment.
| Fastener | Torque (ft-lb) | Torque (Nm) |
|---|---|---|
| Front axle nut | 22–29 | 30–39 |
| Rear axle nut | 36–44 | 49–59 |
| Rear sprocket nuts | 22–29 | 30–39 |
| Chain adjuster lock nuts | 11–13 | 15–18 |
Engine Torque Values
Rocker cover removal is part of any valve clearance service on the 1987 XR100's OHC engine. The cover bolts are small and easy to under-torque—always re-torque them to spec after reassembly to keep the cover gasket from seeping oil at the perimeter.
| Fastener | Torque (ft-lb) | Torque (Nm) |
|---|---|---|
| Spark plug | 11–14 | 15–19 |
| Oil drain bolt | 16–22 | 22–29 |
| Cylinder head bolts | 16–18 | 22–25 |
| Cylinder base bolts | 7–9 | 10–12 |
| Rocker cover bolts | 4–5 | 5–7 |
Suspension & Chassis
The swingarm pivot bolt on the 1987 XR100 is a critical chassis fastener that should be part of every full inspection. A loose pivot worsens progressively under trail use, creating slop in rear-wheel tracking that's immediately noticeable during acceleration and cornering.
| Fastener | Torque (ft-lb) | Torque (Nm) |
|---|---|---|
| Fork clamp bolts | 11–14 | 15–19 |
| Handlebar clamp bolts | 11–14 | 15–19 |
| Swingarm pivot bolt | 36–44 | 49–59 |
| Rear shock upper bolt | 22–26 | 30–35 |
| Rear shock lower bolt | 22–26 | 30–35 |
Maintenance Notes
A 3/8-inch drive torque wrench covers all fasteners on the 1987 XR100 effectively. Use anti-seize on exhaust hardware and corroded aluminum-interface fasteners. Apply blue thread locker to sprocket nuts and shock mount hardware. On any vintage XR, always inspect thread condition before final torquing and replace fasteners that won't hold reliably.
Related Shopping Categories
Shop Torque Wrenches for a 1987 Honda XR100 Dirt Bike.
Shop Wrenches and Sockets for a 1987 Honda XR100 Dirt Bike.
Shop Thread Locker for a 1987 Honda XR100 Dirt Bike.
Shop Additional Tools for a 1987 Honda XR100 Dirt Bike.
Shop Penetrating Oil for a 1987 Honda XR100 Dirt Bike.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.