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Old 01-12-2014, 11:30 PM   #51
Gnarly Adventurer
Joined: Jun 2006
Location: Marin, CA
Oddometer: 409
Originally Posted by COXR650L View Post
Engine is out.
We have the same bike, here's the pile of parts I bought at 90,000 miles:

Here's the thread covering the job:

I would not split the cases unless there is a transmission problem. The crank bearings are an unusual design, split shells that need a precision press tool to get in and out. Steverino did his, I think, but his cases were cracked and had to come apart for welding.

My motor is past 102,000 miles now and I am starting to get some leakage from the cylinder bases. Other than that, she still runs like a train.

I would urge you to do a leakdown test before taking it apart any further, so that you can have a baseline for comparison. When you are done you can check it again to see how you did.

There is considerable debate over how to best prepare the Nikasil liners for new rings. I suggest the ball hone such as this one:

Some people swear by green scotchbrite. I use the BRM hones, as all the nikasil Cosworth DFVs in our shop are done that way, and it works for them.

Good luck!

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