Dirt Bike Bolt, Controls and Skid Plate Check

Step By Step

1. Know which bolts walk out

   Put the bike on a stand and clean it so you can see. Then work the same route every time: bars and triple clamps, front axle, brakes, engine mounts, subframe, exhaust, swingarm, rear axle and sprocket, levers, skid plate. Honda’s pre-ride list names most of these.

   • Lift stand

   How often the manual says to check

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS (race)	After 1 h, then every 15 h	KTM 250 SX-F 2024 owner’s manual, service schedule PDF p. 42 (all screws, nuts and hose clips)
   KTM XC-W, EXC, EXC-F, XCF-W, Husqvarna TE (enduro)	After 1 h, then every 15 h	All screws, nuts and hose clamps. KTM 250 XC-W / 300 EXC / 300 XC-W 2026 OM, PDF p. 55; KTM 450 XCF-W / EXC-F 2025 OM, PDF p. 54; Husqvarna TE 250/300 2026 OM, PDF p. 55
   Yamaha YZ250F / YZ450F (race)	After break-in, before each race	Yamaha YZ250F / YZ450F 2026 owner’s service manual, p. 2-14 (items marked for torque check)
   Honda CRF250R / CRF450R (race)	Before every ride	Honda CRF250R 2025 owner’s manual, pre-ride inspection p. 39 (PDF p. 45)
   Honda CRF450X, CRF250F (trail)	100 mi, then every 1,200 mi	Nuts, bolts and fasteners at 100 mi, then 1,200 mi and 2,400 mi (12 and 24 months), plus the pre-ride check. Honda CRF450X 2025 OM, PDF p. 47; CRF250F 2025 OM, PDF p. 53

   Check your manual’s schedule. If it gives none, check before every ride.

2. Check with a torque wrench

   Set the wrench to the manual value for that bolt and pull until it clicks. If the bolt turns before the click, it was loose. Don’t just crank everything tighter. Over-torque stretches bolts and strips threads in aluminum.

   • Torque wrench
   • Paint pen

   Example: general M8 chassis bolt

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS	25 Nm (18.4 lbf ft)	KTM 250 SX-F 2024 owner’s manual, PDF p. 160 (remaining chassis screws M8)

   Use the value printed for that exact bolt. General tables only cover bolts that have no listed value.

   Shop tip. Draw a paint pen line across each bolt head and the part after you torque it. A split line at the next check shows which bolt moved without putting a wrench on every one.

3. Axles and pinch bolts

   Tighten the front axle first, then the fork pinch bolts. KTM has you pump the front brake and compress the fork a few times before the pinch bolts so the legs line up. On the rear, check the axle nut and the chain adjuster lock nuts.

   • Axle socket
   • Torque wrench

   Front axle / fork pinch bolts / rear axle nut

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS	35 / 15 / 80 Nm	KTM 250 SX-F 2024 owner’s manual, PDF p. 160 (front spindle screw M20x1.5, fork stub M8, rear spindle nut M22x1.5)
   Yamaha YZ250F / YZ450F	115 / 21 / 135 Nm	Yamaha YZ250F / YZ450F 2026 owner’s service manual, p. 2-15 (front axle nut M18, axle pinch bolt M8, rear axle nut M22)

   Honda’s CRF owner’s manuals print no axle torque. Use the Honda service manual value. These are safety fasteners.

   Careful. Axle and pinch bolts hold the wheels on. Use the manual torque and the manual’s tightening order.

4. Bar clamps and triple clamps

   Check the handlebar clamp bolts, the top and bottom triple clamp bolts and the top steering stem bolt. KTM tightens the clamp onto one side first until the clamp and support touch, then tightens all screws evenly, which leaves an even gap at the other side.

   • Torque wrench
   • Hex sockets

   Bar clamp / top triple / bottom triple

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS	20 / 17 / 12 Nm	KTM 250 SX-F 2024 owner’s manual, PDF p. 160 (handlebar clamp M8, top and bottom triple clamp M8)
   Yamaha YZ250F / YZ450F	28 / 21 / 21 Nm	Yamaha YZ250F / YZ450F 2026 owner’s service manual, p. 2-14 (upper handlebar holder bolt, upper and lower bracket pinch bolts, M8)

   Honda’s CRF owner’s manuals print no clamp torques. Use the service manual value. Steering fasteners are safety parts.

   Careful. KTM says to replace a bent handlebar, never straighten it. Bent metal is fatigued and can break.

5. Engine mounts, subframe and exhaust

   Check every engine mount bolt and bracket bolt, then the subframe bolts top and bottom. Grab the silencer and shake it. A loose silencer mount cracks its bracket and lets the subframe take the vibration.

   • Torque wrench
   • Long sockets

   Engine mount bolts / subframe bolts

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS	60 / 35 top, 30 bottom Nm	KTM 250 SX-F 2024 owner’s manual, PDF p. 160 (engine carrying screw M10; subframe top and bottom M8, Loctite 2701)
   Yamaha YZ250F / YZ450F	45 to 55 / 38 Nm	Yamaha YZ250F / YZ450F 2026 owner’s service manual, p. 2-15 to 2-16 (engine mounting bolts M10 by position; rear frame bolt M8)

   Honda lists engine mounting bolts in its pre-ride looseness check but prints no torque. Use the service manual value.

   Shop tip. KTM uses a high-strength thread locker on its subframe screws. If one comes out, clean both threads before you refit it with new thread locker.

6. Disc, caliper and sprocket bolts

   Check the brake disc bolts on both wheels, the front caliper bolts and the rear sprocket nuts. Tighten round bolt circles in a cross pattern, a bit at a time, so the part pulls down flat. Honda says to check the sprocket bolts between motos.

   • Torque wrench
   • Hex and Torx bits

   Disc bolts / front caliper / sprocket nuts

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS	14 / 25 / 35 Nm	KTM 250 SX-F 2024 owner’s manual, PDF p. 159-160 (brake disc M6 and caliper M8 with Loctite 243, rear sprocket nut M8 with Loctite 2701)
   Yamaha YZ250F / YZ450F	12 / 28 / 42 Nm	Yamaha YZ250F / YZ450F 2026 owner’s service manual, p. 2-15 (disc bolt M6 with thread locker, front caliper bolt M8, rear sprocket nut M8)

   Honda says to check sprocket bolts between motos but prints no torque in the owner’s manual. Use the service manual value.

   Careful. Disc and caliper bolts are brake parts. Both KTM and Yamaha specify thread locker on the disc bolts. Keep oil and grease off the discs.

7. Shift lever and brake pedal

   A loose shift lever slips round its splines and ends up too low or too high. Clean the splines, set the lever where your boot meets it, then torque the pinch bolt. Check the brake pedal pivot bolt and that the pedal returns on its own.

   • Hex keys
   • Torque wrench

   Shift lever pinch bolt

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS	14 Nm, Loctite 243	KTM 250 SX-F 2024 owner’s manual, PDF p. 134 and p. 151 (screw, shift lever M6)
   Yamaha YZ250F / YZ450F	12 Nm	Yamaha YZ250F / YZ450F 2026 owner’s service manual, p. 2-13 (shift pedal bolt M6)

   Check your manual for the shift lever bolt torque.

   Shop tip. KTM wants 10 to 20 mm between the shift lever and the top of your boot when you sit in riding position, so the boot doesn’t rest on the lever.

8. Check the skid plate

   Grab the skid plate and try to move it. Check every bolt and rubber bushing at the frame tabs, and look for cracks around the holes. Take it off now and then to clean out packed mud, which hides oil leaks and cracked cases.

   • Sockets
   • Brush

   Skid plate / engine guard bolts

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS (XC, Factory)	10 Nm (M6)	KTM 250 SX-F 2024 owner’s manual, engine guard install PDF p. 63
   Yamaha YZ250F / YZ450F	7 Nm (M6)	Yamaha YZ250F / YZ450F 2026 owner’s service manual, p. 2-16 (engine guard bolt)

   Aftermarket skid plates come with their own torque. If none is given, check your manual for the frame tab bolt size.

9. Throttle and cables

   With the bars straight, turn the grip back and forth and feel the free play before the cable pulls. Then open it fully and let go. It must snap shut on its own. Follow both cables from the grip down and look for kinks, pinches and frayed ends.

   • Ruler

   Throttle cable free play

   Bike	Spec	Source
   KTM / Husqvarna / GASGAS	3 to 5 mm	KTM 250 SX-F 2024 owner’s manual, PDF p. 129
   Yamaha YZ250F / YZ450F	3.0 to 6.0 mm	Yamaha YZ250F / YZ450F 2026 owner’s service manual, p. 2-4 (at the grip flange)

   Honda lists throttle operation in its pre-ride check. The free play value is in the Honda service manual.

   Careful. KTM says to start the engine, idle it and turn the bars lock to lock. If the idle speed changes, the cable routing or play is wrong. Fix it before you ride.

10. Clutch and brake levers

    On a cable clutch, measure free play at the end of the lever and set it with the adjuster at the perch. On a hydraulic clutch, check the fluid level and look for leaks. The front brake lever needs free travel too. KTM asks for at least 3 mm so the brake doesn’t drag.

    • Ruler
    • Cable lube

    Clutch lever free play

    Bike	Spec	Source
    Yamaha YZ250F (cable)	7.0 to 12.0 mm	Yamaha YZ250F 2026 owner’s service manual, p. 2-3 (at the lever end)
    Yamaha YZ450F 2026 (hydraulic)	Hydraulic, check fluid	Yamaha YZ450F 2026 owner’s service manual, p. 2-12 (clutch master cylinder, DOT 4)
    KTM / Husqvarna / GASGAS (hydraulic)	Hydraulic, check fluid	KTM 250 SX-F 2024 owner’s manual, PDF p. 93 (lever position by hand, fluid level check)

    Honda lists clutch lever free play in its pre-ride check. The value is in the Honda service manual.

    Shop tip. Check the lever pivot bolts for play and lube the cable. Frayed strands start where the cable enters the lever and the engine end, so look there first.