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Cam Inserts

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Here are some pics of how I fixed worn cam inserts.

The cool thing is that you can shim them up to play with cam chain tension.

cam%20insert%201.jpg

cam%20insert%202.jpg

cam%20insert%203.jpg

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Pretty sharp looking. Are they brass? How are they attached to the head? What happened to the original journals? Does this mean you had to pull the engine on your new BBR?

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they are made of aluminum bronze.

I had to machine out the originals and make the new insert. they are held in by the cam tower and 2 dowels.

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I've never seen alum. bronze before, how does it compare to silicon bronze as far as machining and wear?

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Very tough and not very easy to machine.

reaming the holes was tough because they ended up under size. I had to use an oversized reamer.

Those pictures I took were after I ran the motor for a year. I just polished them up a bit with scotch bright for the pics. Somebody over at www.4strokes.com wanted to see pics of what I did so I thought I would post it here too. The cam also had no signs of wear.

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I know bronze alloys have very good "oil retention" properties, and wear well, I just haven't used the alum. type before. When you say hard to machine, do you mean tear in machining or warpage wise (you can tell I'm an amateur here)? :cry:

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Just use good cutting tools and you be fine.

phil was just mentioning that it shrank after reaming. That is typical(like stainless). If you bore the holes you will get more consistent results.

BTW~

I like the ti retainers :cry:

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were can you get them? :cry:

be nice to drop that weight of the end of the rocker :cry:

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there are some nice parts on that page

i wonder if those clutch springs will fit the 200?

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