I had the wooden cross pieces on my 87 that looked exactly like Reel's so I'm saying it was factory. My theory is that they put those wood pieces in before foaming so they stop the tank from popping up while the foam expands.
Somebody on here in the past too (I think Spareparts) gave a good reason as to why little squares properly fiberglassed together is stronger than plywood....cant remember the exact explanation but it made alot of sense at the time. Less of a chance for the plywood layers delaminating themselves or something of that nature.
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1986 V-20
1986 Yamaha 150 HP
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