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1977 400F2 first restore project

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McCabe-Thiele (Ted):

--- Quote from: Rozabikes Tim on January 04, 2021, 12:43:18 PM ---
--- Quote from: smoothoperator on January 04, 2021, 12:10:14 PM ---I think the crankcase was doomed from the point someone sheared the bolt, this must have happened when it bottomed out. I have managed to track down the previous owner and he has been kind enough to give me a pretty full history, certainly at some point the bike had crash bars fitted, then removed...I noticed the cracks appear whilst the dirt was still on the casing, so in the first image, the cracks weren't there. I should have taken another image to show how they looked before I cleaned off the dirt to show how they revealed themselves. I'm looking at replacements rather than welding, depending on what comes up. However open to all options at the moment.

--- End quote ---
If you are going down the replacement route I do have a set of cases stashed away under the bench. No crank. Think they have had the usual camchain bolt issue from memory... PM me if of interest. I wont want silly money.

--- End quote ---

This sounds like a life saver or should I say engine saver.

Skoti:
Wouldn't cost you much to try and repair it with metallic repair paste such as JB weld.

Groove the cracks out with a dremmel, clean out with thinners and then apply the metal paste.

If it's not successful then you've not lost much....


Good luck

Skoti

Bryanj:
If you are stripping the engine anyway why not have it welded internaly

taysidedragon:
If you can't fix it I've got a spare set of cases with matching crankshaft.
I need to make some room in the garage!

Laverda Dave:
Bummer :(. That's exactly what happened to my first 400/4. I bought it with crash bars fitted, took them off because they were rusty and replaced the bolts. When I stared the bike I quickly had a pool of oil under the engine from the crack. I bought a replacement engine for £50 from Frank but that was in 1979!

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