Piston Arrow Direction
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Molto Verboso
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: 16 Apr 2011
Posts: 1547
Location: Siam
Thu Nov 19, 2020 2:20 am quote
I know these are dumb questions. I know the arrow points to exhaust port. Is this right? Is the arrow pointing in the right direction? [img]

Itís in an SS180 engine. [/img]

48F52312-AEFF-4261-A05D-0011D8105779.jpeg

Molto Verboso
2007 Stella 150
Joined: 02 Nov 2019
Posts: 1258
Location: Rochester, Minnesota
Thu Nov 19, 2020 3:27 am quote
All of my two stroke scooters have a boost port, I look at the piston and make sure the opening in the piston for the boost port faces the boost port. The exhaust side should have to holes in the piston.
Molto Verboso
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: 16 Apr 2011
Posts: 1547
Location: Siam
Thu Nov 19, 2020 4:02 am quote
Iím sorry, but I donít understand.
Addicted
'64 Motovespa 150S (177) , '66 Allstate SF, '64 VBB, '66 180SS
Joined: 27 Mar 2013
Posts: 774
Location: S.Salem, NY
Thu Nov 19, 2020 4:47 am quote
yes.
Molto Verboso
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: 16 Apr 2011
Posts: 1547
Location: Siam
Thu Nov 19, 2020 5:34 am quote
Moto64 wrote:
yes.
Thatís what I needed to know. Thank you.
Banned
2:6
Joined: 11 Jan 2007
Posts: 7619
Location: San Francisco
Thu Nov 19, 2020 6:54 am quote
beyond the arrow you can look at the locating pins for the rings. Those pins should be opposite the exhaust, and should not intersect any ports.

Put a sharpie mark on the top of the piston where the ring ends/pins are. that will help confirm that everything is as it should be.

The arrow on your piston is really odd, understand the confusion.
Molto Verboso
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: 16 Apr 2011
Posts: 1547
Location: Siam
Thu Nov 19, 2020 7:06 am quote
Thanks very much. I appreciate it. I think the direction of the arrow looks weird as well.
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