VHM Piston Kit ref. APKT12511726A2 for KTM SX 125, HUSQVARNA TC 125 and GAS GAS MC 125 2001-2026

Name: VHM Piston Kit ref. APKT12511726A2 for KTM SX 125, HUSQVARNA TC 125 and GAS GAS MC 125 2001-2026
Brand: VHM
SKU: APKT12511726A2
Price: 171.9 EUR
Availability: InStock

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€171.90

Tax Included

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VHM piston kit Ø 53.93 mm for KTM SX 125, HUSQVARNA TC 125 and GAS GAS MC 125 from 2001 to 2026.

On KTM SX 125, HUSQVARNA TC 125 and GAS GAS MC 125 from 2001 to 2026, the VHM APKT12511726A2 piston kit (Ø 53.93 mm) fits in place of the original part. At the heart of the top end, the piston soaks up the heat and pressure of every explosion. As it wears, the rings no longer seal against the cylinder: compression drops, power drops with it, and the risk of seizure goes up.

Specifications

Brand: VHM
Manufacturer part number: APKT12511726A2
Piston diameter: 53.93 mm
Engine: 2-stroke

When to replace it?

Loss of power, sluggish pick-up, harder starting: compression is dropping.
Piston slap on a cold engine, getting more and more noticeable.
On teardown: vertical scoring on the skirt, stuck or worn rings, thick carbon on the crown.

Replace the piston as set out in your bike's service manual, sooner if you race, and straight away as soon as these symptoms appear. As a Cross-Mania guideline, plan for a new piston every 20 to 40 hours of engine running depending on whether you race or ride for fun. Always measure the cylinder at the same time: a new piston in an oval cylinder won't last.

Fitting tips

Clean the cylinder and check it: diameter, ovality, taper and condition of the bore coating.
Check the end gap of each ring in the cylinder against the figures in the manual or the manufacturer's instructions.
Fit the rings with the mark facing up and each gap correctly located on its locating pin.
Check the small-end needle bearing and the pin: at the slightest play, tight spot or marked needle, replace the bearing.
Fit the piston with its arrow pointing to the exhaust side, oil the pin and the small end, then fit the circlips without distorting them, gap opposite the notch. A circlip that has been taken out is replaced with new piston pin circlips, never refitted.
Reassemble with a new top end gasket kit and tighten the cylinder head in a criss-cross pattern to the manufacturer's torque.
Refill the coolant and fit a new spark plug.
Break the engine in: warm it up gently, vary the revs and avoid sustained full throttle for the first hour.

Why VHM?

Founded in 1995, VHM specialises in racing engine parts for motocross, road racing and karting. The brand started out with cylinder heads featuring interchangeable combustion chambers, which became its speciality, and then developed crankshafts, connecting rods and gasket kits.

Spare parts and items to plan

Piston rings : PROX 02.6225 · PROX 02.6220
Piston pin : VERTEX · WOSSNER
Top-end gasket kit : ATHENA · CENTAURO
Small end needle bearing : PROX · NTN
Spark plug : NGK 2707 · NGK 6801
Coolant : LIQUI MOLY 1 L · TWIN AIR
2-stroke oil : LIQUI MOLY 1 L · MOTUL 800 1 L

Frequently asked questions

Does the kit include the gaskets?
No: the kit contains the piston, rings, pin and circlips. Add a top end gasket kit, because a head or base gasket can never be reused.

Can I replace just the rings later?
Yes, as long as the piston and cylinder are still within tolerance. Replacement rings can be ordered on their own, as can the piston pin and the circlips.

Should I replace the small-end needle bearing?
It isn't included. Check it at every piston change and replace the needle bearing at the slightest play or tight spot.

Compatibility

Check the exact model and year of your bike in the list below before ordering.

BrandVHM

Reference APKT12511726A2

In stock5 Items

Specific References

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VHM Piston Kit ref. APKT12511726A2 for KTM SX 125, HUSQVARNA TC 125 and GAS GAS MC 125 2001-2026

€171.90

Tax Included


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VHM Piston Kit ref. APKT12511726A2 for KTM SX 125, HUSQVARNA TC 125 and GAS GAS MC 125 2001-2026

Specifications

When to replace it?

Fitting tips

Why VHM?

Spare parts and items to plan

Frequently asked questions

Compatibility

VHM Piston Kit ref. APKT12511726A2 for KTM SX 125, HUSQVARNA TC 125 and GAS GAS MC 125 2001-2026