Malossi 166 single piston ring piston
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Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3843
Location: Oceanside, CA
Mon Jan 11, 2021 11:54 pm quote
Does anyone know if the Malossi 166 kits ever came out with a single ringed version? A Stella guy near me was sold a used 166 kit with a single ringed piston. Sadly the kit is well used and piston rattles inside the cylinder. I told him Id sell him a Polini 177 I had sitting in my garage and give him some credit for the Malossi 166. Ill hone it and put on the shelf for the next guy needing a kit.

So, did Malossi 166 kits ever come with the single ring (Mark 1 kit maybe?) And question number 2, does it matter if I swap pistons to the 2 ring (Mark 2 version)?

Thanks guys
Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2574
Location: London UK
Tue Jan 12, 2021 12:21 am quote
MHR177 piston should fit. It is single ring.
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 8363
Location: The state of insanity, SoCal
Tue Jan 12, 2021 5:09 am quote
I know that early and race-y small frame stuff came with a single ring, so Id assume that a very early 166 would be the same?

Id be interested to see it, in that the single ring version of a 130 I have is totally different than the 135 piston with duals.

-g
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3843
Location: Oceanside, CA
Tue Jan 12, 2021 3:05 pm quote
Measured 60.7mm on the piston. Underside of the piston shows CDC BRLY and ASSO-W 2544

80F59AA1-B9C8-4ABD-A58C-30BC172F79B0.jpeg

Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3843
Location: Oceanside, CA
Tue Jan 12, 2021 3:07 pm quote
Previous owner had to grind off the Malossi cast into the side to get it to fit the electric start flywheel.

I looked on SIPs site and all the 177 pistons are 63mm. Old 166 pistons are 61mm. Anyone got a link to a working single ring piston?

A8DA267E-FD9C-4D05-BFAA-C0CFF66E817C.jpeg

Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3843
Location: Oceanside, CA
Wed Jan 13, 2021 6:24 pm quote
So Ive tried the usual domestic and foreign shops for a single ring piston in the 60-61mm size but cant find any. Im thinking I could go double ring and get by that way unless anyones got any ideas/ generic piston from someone else????
Ossessionato
1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 2586
Location: Staten Island, NY
Wed Jan 13, 2021 6:30 pm quote
The transfer and boost ports in the 2 ring piston later malossi 166 kit are nearly identical. The only difference I can see is the two side skirt openings are one big one on mine and a small above a medium one on each side on yours.

I would guess that a 2 ring piston for later malossi 166 kits like mine would work fine, but I'm just guessing.

IMG_20190815_103229.jpg
later 2 ring piston malossi 166 kit (166 mkIII)

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