AUMEL 54mm Cylinder Piston Kit For Stihl MS660 066 MS650 064 Chainsaw Replace 1122 020 1211.

worked fine

Saw has a ton of power with this big bore kit everything seemed just as good as oem stihl quality we will see how long it’ll last

Works great

Bought this for a holtzforrma g660 (stihl knock off). The cylinder head did not match my bolt pattern for my saw. I really only needed the piston and rings so wasn’t a complete failure.

Right product for the job.

Update 32.02.2023I just confirmed timing numbers and compared them to the original holzfforma.this one has garbage intake timings of 186°, the exhaust ist at 190°The holzfforma was at good intake numbers of 158° and exhaust 164°.The holzfforma one ran good and had good power.This one here is junk.Update 06.02.2023downgraded to 1 star. This thing makes no power. It works, but not like a 92cc saw. I will further investigate what the cause is, Probably the piston being too short and the timings being off.Update 23.01.2023 I upgraded it from 3 stars to 4 stars.I was milling a big trunk 220cm's long which maxed the 90cm bar out to it`s full length.there is power lacking compared to the "original" holzfforma but it did the job well.after cooking my last cylinder / piston I did some research on how to enhance my milling and not have any more breakdowns.I was now adjusting the fuel during the milling process.you have to have the "4-stroking" when you lift the bar off of the wood so that it doesn't have any more load.If you are watching videos of muppets that adjust the high based on rpm or the pressure in their glass eye then switch to another channel!First review:The port timing is completely different in this cylinder.The casting and finishing is horrible. Ports are completely distorted.Openings are angled, not true!My index finger fits in the exhaust port of the holzfforma but gets stuck in the port of this cylinder.There will be a significant loss in power if it runs at all.The upper edge of the exhaust is 3.2 mm lower than the stock holzfforma!It's about the same for the lower edge. The entire exhaust port has moved down by 3.2 mm.The transfers are 1.64 mm lowerThe Intake is 2.6 mm lowerpiston from top ring to Crown -0.5mmfrom piston pin to crown -0.5mmBlowdown is 3.8 mm instead of 2.05 mm (so there might be room to correct all this mess hopefully)I will update once I have a degree wheel to accurately measure port timings.But it runs and revs OK. Need to see how it pulls.

This kit only lasted 15 minutes of light cutting after I installed these new parts. When I took the saw back apart, it was clear the plating on the inside of the cylinder had failed and bubbled up (see photo). When the plating came off it caused the piston to get slightly scored by the plating debris in the cylinder. This kit is a waste of time.

I've gotten this brand before but this time I wasn't satisfied.Quality control issues.