Piston Ring Set 56mm x 1.2mm for Stihl 066 MS660 Big Bore Chainsaw 2 Rings

Piston ring set for Stihl 066 and MS660 big bore chainsaws — 56mm x 1.2mm, two rings.

Rings wear out long before the piston does. A fresh set restores lost compression and brings a tired saw back to life, at a fraction of the cost of a full top end rebuild.

These are the same rings supplied in our Stihl 066 MS660 56mm big bore piston and cylinder kit, available here on their own.

Specifications:

Spec	Detail
Diameter	56mm
Thickness	1.2mm
Quantity	2 rings
Type	Aftermarket replacement part

Suits Stihl:

066 - MS660 fitted with a 56mm big bore cylinder

Check your bore before ordering. A standard 066 or MS660 is 54mm and takes a 54mm ring, not this one. This set is for saws already upgraded to a 56mm big bore cylinder. If you're not sure, measure across the top of the cylinder — see our 54mm set if yours is standard.

What you get:

2x piston rings

Piston, gudgeon pin and circlips are not included. If you need the complete piston, see our Stihl 066 MS660 56mm big bore piston kit. For a full top end, see our 56mm big bore piston and cylinder assembly kit.

Fitting tip:

Two-stroke rings sit over a locating pin in the piston groove that stops the ring rotating into a port. Make sure each ring gap seats either side of its pin before sliding the piston into the cylinder — forcing it in misaligned will break the ring.

WARRANTY OVERVIEW

Jono & Johno offers a 12-month warranty on most products.

We pride ourselves on selling good quality gear and will be fair and prompt in honouring our warranties. If you’re in trouble, we’ll help you out.

WHAT IS COVERED?

The exact warranty coverage depends on two factors:

Whether the fault is due to user error or a manufacturer defect
Whether the fault is minor or major

Minor faults caused by the user

Parts will be supplied for repair at the user's expense.

Minor faults caused by the manufacturer

Customers are expected to perform basic repairs as part of our warranty process.
Jono & Johno will provide replacement parts and instructions for simple repairs, such as installing a recoil starter.
Jono & Johno will determine whether a fault is classified as minor.
If unsure about a repair, contact us, and we’ll assist you.

Major faults caused by the manufacturer

Jono & Johno will arrange a return, refund, or replacement at our expense.
If preferred (and at our discretion), we may provide replacement parts and contribute to labour costs if you can perform the repair.

Major faults caused by the user

Where possible, parts will be supplied at the user's expense.
If the item cannot be repaired by the user, we offer repairs at our workshop at $80 AUD per hour.
The customer will need to cover return shipping costs for user-related faults.

RETURN PROCESS & SHIPPING COSTS

If you need to return your product:

In-store return: If you're near a Jono & Johno outlet, you can return the product in person. Contact us first to arrange a return authority.
Shipping return: If you are not within driving distance, we will provide a return address.
- If the fault is due to a manufacturer defect, we’ll cover return costs.
- If the fault is user-related, the customer is responsible for return shipping.

EXCEPTIONS TO THE RULE

Some products are not covered by warranty, including:

Engines used in go-karts and stump grinders

OUT-OF-WARRANTY PRODUCTS

If your product is out of warranty and has failed despite minimal use, contact us. We may assess it on a case-by-case basis. If a manufacturer defect is identified, we aim to be fair in resolving the issue—but this is at our discretion.

SKU	QGBB66056B-P-Rings
Model #	QGBB66056B-P-Rings
Barcode #	721814475555
Brand	JONO & JOHNO
Shipping Weight	0.0500kg
Shipping Width	0.050m
Shipping Height	0.050m
Shipping Length	0.050m
Shipping Cubic	0.000125000m3