OP
@mjrally avatar
UTC

Veni, Vidi, Posti
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: UTC
Posts: 5078
Location: Oceanside, CA
 
Veni, Vidi, Posti
@mjrally avatar
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: UTC
Posts: 5078
Location: Oceanside, CA
UTC quote
I tore apart my P200 looking at one problem and found 4 others One of them being both piston rings were glued in to their slots with lots of blow by. The top end has 2 years of use on it and while the crown looks fair, the ring grooves are all gunked up.

Anyone got any recommendations for an overnight soak to help clean out the grooves? The dental pick/screwdrivers aren't doing the best job by themselves.
@markosmarkos avatar
UTC

Hooked
Joined: UTC
Posts: 196
Location: no matter where you go, there you are
 
Hooked
@markosmarkos avatar
Joined: UTC
Posts: 196
Location: no matter where you go, there you are
UTC quote
I had a piston with stuck rings. An old broken ring, a file to make sure the broken edges were clean and sharp, some simple green, and some elbow-grease and the grooves cleaned up really nice.

Hope this helps.
@christopher_55934 avatar
UTC

Ossessionato
2007 Stella 225
Joined: UTC
Posts: 3547
Location: Rochester, Minnesota
 
Ossessionato
@christopher_55934 avatar
2007 Stella 225
Joined: UTC
Posts: 3547
Location: Rochester, Minnesota
UTC quote
Does this happen because of the type of two stroke oil being used? Is there a better synthetic oil that could reduce the issue?
@grumpnut avatar
UTC

Hooked
'58 VBA
Joined: UTC
Posts: 375
Location: Chico CA
 
Hooked
@grumpnut avatar
'58 VBA
Joined: UTC
Posts: 375
Location: Chico CA
UTC quote
Simple green mixed with near boiling water and let it soak a bit.
@christopher_55934 avatar
UTC

Ossessionato
2007 Stella 225
Joined: UTC
Posts: 3547
Location: Rochester, Minnesota
 
Ossessionato
@christopher_55934 avatar
2007 Stella 225
Joined: UTC
Posts: 3547
Location: Rochester, Minnesota
UTC quote
How about using an ultrasound cleaner?
@waspmike avatar
UTC

Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: UTC
Posts: 4109
Location: Kingdom of Lanna
 
Ossessionato
@waspmike avatar
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: UTC
Posts: 4109
Location: Kingdom of Lanna
UTC quote
Mr. Muscle oven cleaner.

Although can says not on aluminum it doesn't actually harm aluminum. Might take the shine of aluminum plate but does no serious harm.

If overly concerned you can test yourself on an old bit of aluminum.
@socalguy avatar
UTC

bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7093
Location: So Cal
 
bodgemaster
@socalguy avatar
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7093
Location: So Cal
UTC quote
Another vote for oven cleaner. It's sodium hydroxide... a relatively mild acid. My brand is "Rinso" ... lemon scented.
Forum member supplied image with no explanatory text
@greasy125 avatar
UTC

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: UTC
Posts: 14763
Location: The state of insanity, SoCal
 
Sergeant at Arms
@greasy125 avatar
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: UTC
Posts: 14763
Location: The state of insanity, SoCal
UTC quote
dollar store oven cleaner for the quickness.

pine-sol for an overnight.

carb dip/carb cleaner or brake clean for an in between the two, especially good with a wire brush and part of an old broken ring to scrape.

hth!

-g
@vespergeezer avatar
UTC

Addicted
GTS300, Cosa LX200
Joined: UTC
Posts: 578
Location: Sunny South West UK
 
Addicted
@vespergeezer avatar
GTS300, Cosa LX200
Joined: UTC
Posts: 578
Location: Sunny South West UK
UTC quote
Nerd emoticon Sodium hydroxide is an alkali, not an acid, (weak or otherwise)...
@moto64 avatar
UTC

Molto Verboso
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1774
Location: S.Salem, NY
 
Molto Verboso
@moto64 avatar
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1774
Location: S.Salem, NY
UTC quote
Just be sure you don't scrape up the bottom 'land' of the ring groove as that is the seal for the ring.
@waspmike avatar
UTC

Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: UTC
Posts: 4109
Location: Kingdom of Lanna
 
Ossessionato
@waspmike avatar
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: UTC
Posts: 4109
Location: Kingdom of Lanna
UTC quote
Moto64 wrote:
Just be sure you don't scrape up the bottom 'land' of the ring groove as that is the seal for the ring.
Use soft plastic/wood scrapers or tooth picks
@socalguy avatar
UTC

bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7093
Location: So Cal
 
bodgemaster
@socalguy avatar
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7093
Location: So Cal
UTC quote
VesperGeezer wrote:
Nerd emoticon Sodium hydroxide is an alkali, not an acid, (weak or otherwise)...
It's lye. It works. Don't be frightened of it.
@vespergeezer avatar
UTC

Addicted
GTS300, Cosa LX200
Joined: UTC
Posts: 578
Location: Sunny South West UK
 
Addicted
@vespergeezer avatar
GTS300, Cosa LX200
Joined: UTC
Posts: 578
Location: Sunny South West UK
UTC quote
No word of a lie! Laughing emoticon (But use sensible precautions).

BTW 'lye' refers to a group of metal hydroxides- usually potassium or sodium hydroxide...

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