How the Fuel Line Comes Off and Goes Back On — 2013 KTM 85SX

Shop parts for a 2013 KTM 85SX Dirt Bike.

Fuel line replacement sits near the top of the high-value, low-difficulty maintenance list on a 2013 KTM 85SX. The hose is short, the fittings are simple, and the payoff is a fuel system you can stop worrying about. What follows covers identifying what you have, spotting a line on its way out, and getting the new one leak-free.

What a Dying Fuel Line Looks Like

Fuel line problems show up two ways: something you see and smell, or something you feel while riding. Both are worth taking seriously on a 85SX.

  • Evidence on the ground. A drip or dark patch under the bike after it sits overnight.
  • The smell of raw gasoline. Noticeable with the engine cold and unrun.
  • Surface cracking on the hose. Especially at bends and where the line slides over fittings.
  • Weeping under light pressure. Push gently near a fitting and watch for moisture at the joint.
  • Fuel starvation symptoms. Bogging or cutting out as though the tank ran dry when it clearly has not.

Why Fuel Lines Harden, Crack, and Fail

It helps to treat fuel line as a consumable rather than a permanent part. The material is engineered to stay soft and seal against a barbed fitting, and it loses that ability gradually as heat cycling, sun exposure, and plain calendar age push it the same direction — a dry climate does it fastest. Fuel chemistry compounds the problem. Ethanol blends sitting through a long off-season absorb water and begin to separate, which is harder on rubber than fresh fuel and leaves gum behind. On a 2013 KTM 85SX stored more than ridden, that combination is the usual culprit.

What You Are Working With on the 85SX

The fuel system on your 2013 KTM 85SX uses a carburetor, and the petcock is your shutoff. Fuel flows by gravity alone from tank to float bowl through one hose, secured at each end by a spring pinch clamp or a small screw clamp. That is the whole circuit, and it is why this job is beginner-friendly on a two-stroke machine.

Tools & Preparation

This is a low-cost job, and most of the preparation is about containing fuel rather than turning wrenches.

  • Replacement fuel line in the correct inside diameter and length for your 2013 KTM 85SX. Match the original rather than guessing — oversized line will not seal on the barb.
  • New clamps. Spring clamps lose tension with age, and a small clamp kit costs very little.
  • Nitrile or rubber gloves. Gasoline absorbs through skin.
  • A fuel-safe drain container and a funnel if you plan to reuse the fuel.
  • Pliers and a small flat screwdriver for spring and screw clamps respectively.
  • Shop rags and eye protection.

A word on handling fuel, because this is the part with real consequences: gasoline vapor is heavier than air and will travel across a floor to any spark or flame. Open the door, shut off pilot lights, cap your container, and let the bike cool. Gloves and eye protection are not optional.

Draining Down and Pulling the Line

Turn the petcock to the off position. On the 2013 KTM 85SX this is the valve underneath the tank, and closing it stops fuel at the source. If your petcock has a reserve position, confirm you are fully off rather than on reserve.

Drain what is trapped downstream. The simplest route is the carburetor float bowl drain — run a short hose from the drain nipple into your container, back the screw out, and let the bowl empty. Snug the screw back up afterward so you do not forget it.

Now free the clamps. Spring clamps come off by squeezing the tabs with pliers and sliding the clamp back along the hose; screw clamps need a few turns of a flat driver. With both retracted, twist the hose on the fitting to break the seal, then work it off. Hardened line often resists — a gentle rotating pull beats brute force, and if it truly will not budge, slit the hose lengthwise with a blade and peel it off rather than levering on the fitting.

Routing and Securing the New Line

Use the removed hose as your measuring stick and cut the new one to match. On a 2013 KTM 85SX the correct length stays clear of moving and hot components while still absorbing engine movement without pulling on either fitting. Square off both ends with a sharp blade.

Start at the petcock. Work the hose on until the barb is fully buried — a partial seat is the most common cause of a post-repair leak. Warming a stiff hose helps it slide; lubricating the fitting does not. Leave grease and oil out entirely, since either prevents the rubber gripping properly and can end up inside the carburetor.

Then connect the carburetor side and dry-fit before clamping. Mount the tank if it was removed and verify the hose is not trapped, stretched, or resting on the head. Once the routing looks right, place a clamp at each end over the fitting itself and bring it to snug. New spring clamps are hard to overdo; screw clamps need restraint.

Leak Check Before You Ride

With the new line in place, open the petcock and stop. Let the 2013 KTM 85SX sit five minutes over a clean surface and use that time to examine both joints under a flashlight. A properly seated hose stays completely dry; anything else needs attention before the wheels turn.

The running test comes second. Fire the engine, let it warm, and look again — expansion and vibration find seals that hold fine cold and still. When you find a weep, resist the urge to overtighten. Disconnect, verify the hose is pushed fully over the barb, and reassemble; that is nearly always the actual problem.

Wrap up by disposing of the drained fuel appropriately and taking another look at the connections after your next ride. On carbureted bikes an inline filter, if fitted, is a serviceable part worth replacing at the same time. For deeper background on keeping fuel lines healthy between seasons, our general guide to replacing a dirt bike fuel line is a useful companion read.

Related Shopping Categories

Shop Fuel Lines for a 2013 KTM 85SX Dirt Bike.

Shop Fuel Line Clamps for a 2013 KTM 85SX Dirt Bike.

Shop Petcocks for a 2013 KTM 85SX Dirt Bike.

Shop Fuel Filters for a 2013 KTM 85SX Dirt Bike.

Shop Fuel Stabilizer for a 2013 KTM 85SX Dirt Bike.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your dirt bike'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.