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Anyone got any tips on cutting seat foam ?

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mike the bike:
I modified a jigsaw blade, making the cutting edge thin like a knife, and slightly wavy.

Tomb:
However you cut it you always end up with lumpy bits that need a slight trim which is hard to do. For this I always use an angle grinder with sanding flap wheel, a worn one is best coz it fair takes off the foam so gently does it.

Laverda Dave:
Back in the day when I was a coach trimmer we used an Eastman electric reciprocating knife to cut foam, these always had very thin, flat knife edge blades and always gave a perfect finish.  The electric carving knife idea is the closest thing to it, only problem is the serrated blades rip into the foam. Ideally take the blades and grind them to knife edge. You can buy replacement blades for £11 on ebay.

Rozabikes Tim:
We used those Eastman knives in the upholstery trade. Bloody lethal - hence chain mail gloves etc. :P

Laverda Dave:
We didnt have any chain mail gloves, in fact no H&S equipment back in the late 70's/80's!  The only H&S 'regulation' we had then was apprentices were not allowed to use the knives unless supervised! We used to cut through 10 layers of thick seat moquette at once to make the train seat covers for the underground.
I used to do a lot of 'private jobs' during my lunch breaks back in the early 80's modifying motorcycle seats, usually making them into stepped seats as this was the craze at the time.  If you look under my bench in the photo you can see the seat base of a 400/4 I was modifying for a mate.  The second photo shows the completed seat on his yellow 400/4, we were going on a trip to Wells-next-the-sea.  My mate asked me to cut 1.5 inch out of the seat to make him sit lower and to build the pillion seat up by about 4 inches.  I'm glad it wasn't my backside sitting in that seat for for hours on end with very little foam left!
I was on my red 400/4 in the photo complete with a car stero lashed to the petrol tank with speakers mounted into the fairing. The bike handled like a barn door in a gale and would dance across three lanes of a motorway above 80!
Can you imagine cutting up a 400/4 stock seat nowdays!

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