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GCV 160
by NormK - 11/11/25 08:22 AM
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Joined: Nov 2016
Posts: 56
Victa obsessed
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Hi all, I was recently cleaning a victa 125 piston out of a model 5, and cast into the piston just below the hole for the gudgeon pin is cast in capitals TOLSON. I am just wondering if this is some prototype or something.
Last edited by CyberJack; 17/12/16 08:50 PM.
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Joined: Nov 2013
Posts: 6,938 Likes: 308
Forum Historian
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Hello TRV
I would be most curious to know if this is a standard piston size.
There were a number of after-market suppliers of Victa pistons.
Tolson may have been such a company ...
If Tolson appears on a standard size piston then this may be
evidence that they were an OEM and supplier to Victa Mowers.
I think we can rule 'prototype' out.
----------------------
Jack
Last edited by CyberJack; 17/12/16 08:50 PM.
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Joined: Nov 2016
Posts: 56
Victa obsessed
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Yeah, well I didn't think it would be a prototype, but who knows? On the other hand, when I removed the piston from the block, it had obviously been in there a VERY VERY long time and took the same amount of pressure to remove as a untouched power torque piston. Besides, it would be quite hard to Rebore the block as the transfer ports were just two decent sized holes next to one another with a gasket and a bit of metal on top.
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Joined: Nov 2016
Posts: 56
Victa obsessed
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Sorry, forgot to finish that post pt2: which would make you think that if you rebored, it would theoretically alter the performance a bit. How big was the standard size piston by the way, because I will measure it up.
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Joined: Jan 2012
Posts: 1,842 Likes: 14
Moderator
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Standard Victa 125cc piston spec is 2.115" diameter at top ring land, 2.120" at bottom of skirt. Standard bore is 2.125".
Reboring these barrels was/is no problem at all. In fact changeover rebore kits are still available through the trade for the Model 1-4, and Model 5.
Cheers,
Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
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Joined: Nov 2016
Posts: 56
Victa obsessed
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Yeah, The only reason I thought it would be hard because the Transfer ports are very very different to the later model ones.
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Joined: Nov 2016
Posts: 56
Victa obsessed
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Just went out to the shed and measured them, and guess what! It's the standard size piston and bore!!
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Joined: Nov 2016
Posts: 56
Victa obsessed
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Sorry, it actually says POLSON inside the piston, sorry 4 the mistake.
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Joined: Nov 2013
Posts: 6,938 Likes: 308
Forum Historian
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Thanks TRV
Polson was an old, established Piston maker.
It would be highly likely they were an OEM supplier to Victa.
-----------------------
Jack
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