Two Morons Restore a Vintage Motorcycle Seat - Part 4 - Seat Foam Repair and New Upholstery How To

This week finish up fixing our DIY saddle (or seat cover) on a vintage 1972 Honda CB350 Four. We use our bag of tips and tricks (and a handful of cheap tools from Walmart, Amazon and eBay) to repair the seat pan and seat foam. We also add a nice new vinyl upholstery cover by the time we are done. Last week we did a little nickel plating to fix the rusted chrome and this time, we are shaping the foam and laying down a new, perfect, wrinkle free vinyl seat cover! We also cut a stencil out on the vinyl cutter and spray on some Duplicolor Fabric and Vinyl dye to add a Honda Logo to the sea. These techniques should work on any old motorcycle from Yamaha or Kawasaki, or Suzuki, or whomever.

Here are the earlier videos in this restoration series if you missed them and and to check them out!

   • BUDGET Vintage Motorcycle Seat Restor...  

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I found a nice way to lay down your new seat cover perfectly tight and wrinkle free! The trick is to cut up a bunch of carpet tack strips and rivet them to the seat pan. This gives you a ton of little spikes to stretch and hook the new seat vinyl too. You can stretch and reposition at ease until you get everything perfectly smooth!

After the carpet spike are in place we start sanding our $10 Walmart camping mat seat foam repair. We start by rough trimming everything with an electric bread knife and sand everything to the final shape with 80 grit sand paper on a pneumatic sander.

We then test fit the new seat cover and continue to shape the foam as needed. The final trick to covering up all of our seat foam damage repairs is to glue down a piece of flex foam sew in fabric. The flex foam hides any little imperfection in the old foam below it.

The new seat cover from Amazon was really nice quality. It stretched over the carpet tack spikes perfectly. We used a chrome suv and truck door ding trim piece from O'riely Auto. The stuff looks just like the original Honda chrome trim.

For the finishing touch, we cut out a Honda logo stencil on the vinyl cutter and use a little Duplicolor white vinyl dye to spray on the logo. It turned out fabulous.

0:00 - Intro
0:20 - Installing Carpet Tack Strips on the Seat Pan
4:21 - Shaping the Seat Foam Repair
8:43 - Using Flex Foam to Smooth Everything Out
10:01 - Installing the New Seat Cover
11:29 - New Chrome Trim Install
12:45 - Installing the Seat Cover Strap and Buckles
14:39 - Adding a Honda Logo to the Cover



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