Bearing Drivers for 2 stroke rebuilds?

[lynn haddock]

Installing the bearings at room temperature almost will guarantee a loss of interference fit due to the burnishing action of the steel bearing to the aluminum cases. It may work in the short term but sooner or later you will have bearings spining in the cases. Also when attempting this operation at room temp, it is VERY EZ to get the bearings out of square which can seriously distort the bearing pocket integrity (roundness).

[Pete Muller]

quote:

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Originally posted by John Denman:
Pete,

Any suggestions on where to send my CR125 cases, and any idea on the cost I would expect to pay?

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John,

I am just now in the process of wrapping up the tooling to do CR125 cases. When I initially set up to do the 80s, I thought I would follow that closely with with the tooling for 125s, however this year/season has been very, very busy, so the project just kept getting put on the back burner. I'm close now though.

fwiw: The volume of 100cc cases I've seen this year (obviously mostly KT100) has not diminished in any way. If anything, it's growing. I sure don't see any mass exodus to shifter engines. I think shifters are growing, however my business would indicate it's not necessarily growing any faster than 100cc stuff (and definitely not "taking away" from 100cc either). Also... I suspect that there are probably lots of people that have bought 125s that still have an older kart with a KT100 laying around... and that's what gets raced at local/club races.

To your other question: With the current alloy(s) that Yamaha and Honda are using (KT100, CR80, CR125), I don't believe it's significant to "season" the cases before blueprinting. The current alloys are not overly stable anyways - - and seem to be about the same "new" as they are "seasoned".

Pete
Muller Machine

[ October 08, 2001: Message edited by: Pete Muller ]

[John Denman]

Pete,

email me at johndenman@home.com when your are ready for the CR125.