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Ossa Mar Rattle


nickyburnell
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I believe Marlimar isn't his living and he has full time job elsewhere, so it can take him a while to respond, but he's a great bloke with an Aladdins cave of parts, those of us with old Ossas need him.

 

I think it's been explained about trimming the piston skirt.

Gauge first if it restricts the flow.

ie, is the gap smaller than the carbs bore with the piston at TDC.

Then file it down if needed, clean up the edge and wash it off well.

 

I seem to remember the OE pistons came with a smaller length skirt on the intake side and the pattern 73mm I fitted didn't, it just needed a small adjustment with the hammer!

 

Let us know how you get on.

 

Edited by goudrons
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Piston here now, from InMotion, it is a Spanish one from Ital, they come in 72, 72.25, 72.5 (mine), 72,75 and 73. Skirt is full length but IM said they could have had it sorted.

I have been informed by a few that full length skirt made absolutely no difference to bikes performance. It would of course be a better balance like that. My re-borer is very experienced, shall ask him his opinion.

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