Malossi piston deciphering
OP
MJRally
Fri, 08 Sep 2023 06:21:06 +0000
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73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
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MJRally
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73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: Thu, 19 Jan 2012 07:14:28 +0000
Posts: 4883
Location: Oceanside, CA
Fri, 08 Sep 2023 06:21:06 +0000 quote
Old school Malossi 210 kit I received needs a new piston. Head is too pock marked to make out any old writing. Anyone know how to tell if its an A, B, C piston? 68.3-68.4mm diameter. SIP's description shows every piston @ 68.5mm.


Looks like this


Metal clutch side seal nicked it up a bit.

SaFiS
Fri, 08 Sep 2023 07:01:44 +0000
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1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
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SaFiS
Ossessionato
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: Sun, 02 Aug 2015 18:39:51 +0000
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Location: Veria, Greece
Fri, 08 Sep 2023 07:01:44 +0000 quote
There should be letters on the base of the cylinder (boost port). Replacement pistons are the newer Vertex with the graphite coating, they work fine on old kits and are better. If you can have the cylinder measured it would be best so you can choose a "thicker" piston to make for wear…

Tolerances…

"0" = 68.410 - 68.419
"A" = 68.420 - 68.429
"B" = 68.430 - 68.439
"C" = 68.440 - 68.449
"D" = 68.450 - 68.459
"H" = 68.490 - 68.499
Jack221
Fri, 08 Sep 2023 07:14:16 +0000
Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
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Jack221
Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
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Location: London UK
Fri, 08 Sep 2023 07:14:16 +0000 quote
If the piston is that bad on the crown, the bore may not be in mint condition. Especially at the top 1/4 inch.
+1 on vertex piston better matched than the original.
OP
MJRally
Sat, 09 Sep 2023 21:02:09 +0000
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: Thu, 19 Jan 2012 07:14:28 +0000
Posts: 4883
Location: Oceanside, CA
 
MJRally
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: Thu, 19 Jan 2012 07:14:28 +0000
Posts: 4883
Location: Oceanside, CA
Sat, 09 Sep 2023 21:02:09 +0000 quote
Looks like I've got the B version. Question now is single ring or double ring? I'm think double as I'm not going to be using this immediately and it will never go into anything too hot.



https://www.sip-scootershop.com/en/product/piston-malossi-b-221-210-sport-mhr_3416293B?q=Malossi%20piston

https://www.sip-scootershop.com/en/product/piston-malossi-b-210-sport-2016_3416294B



OP
MJRally
Tue, 12 Sep 2023 19:24:19 +0000
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: Thu, 19 Jan 2012 07:14:28 +0000
Posts: 4883
Location: Oceanside, CA
 
MJRally
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: Thu, 19 Jan 2012 07:14:28 +0000
Posts: 4883
Location: Oceanside, CA
Tue, 12 Sep 2023 19:24:19 +0000 quote
Bump. Penny for anyones thoughts?
SaFiS
Tue, 12 Sep 2023 19:50:37 +0000
Ossessionato
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: Sun, 02 Aug 2015 18:39:51 +0000
Posts: 3817
Location: Veria, Greece
 
SaFiS
Ossessionato
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: Sun, 02 Aug 2015 18:39:51 +0000
Posts: 3817
Location: Veria, Greece
Tue, 12 Sep 2023 19:50:37 +0000 quote
Stay double ring but as I said it would be better to have the cylinder measured. On most old kits I worked on we went for the next grade to make for wear and avoid the famous Malossi rattle…
OP
MJRally
Tue, 12 Sep 2023 20:13:05 +0000
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: Thu, 19 Jan 2012 07:14:28 +0000
Posts: 4883
Location: Oceanside, CA
 
MJRally
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: Thu, 19 Jan 2012 07:14:28 +0000
Posts: 4883
Location: Oceanside, CA
Tue, 12 Sep 2023 20:13:05 +0000 quote
Excellent! Thank you
  DoubleGood Design  
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