Main Motorcycle: 1978 Triumph Bonneville
Join Date: Mar 2005
Location: Houston, tx
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Hone the bore fairly coarse, like a 250 grit. Most people try to install the pistons with a minimum of oil on the bores to aid in break in. Also, avoid break-in oil with friction reducers like modern car oil. I'm using 15w40 Rotella diesel to break in a Commando I'm rebuilding.
There are lots of opinions on break-in oil. Do a search and you will get the idea.
I would highly recommend you get the book "Building Budget Brits" by Mike Brown. Its usually available in paper back on Amazon for around 25 bucks. I can almost gaurantee the info in it will save you the cost of the book many times over. There are also some DVDS out showing how to rebuild a Triumph unit engine. One is by Wes at 4 Aces and is available from Low Brow customs.
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