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« on: May 04, 2008, 03:08:49 PM »
Greetings all,
A first post, and I'm begging for advice:
A local bike shop has a Bantam (shocks at the rear, not plungers) that looks like it has had some time and money spent on it. The shop owner says the previous owner had "everything done with the engine- head and barrel off, barrel bored, new piston, new rings yad yada". Put it together, started it, and it went thump thump thump from the bottom end. He claims the new top end produced compression too high for the bottom end to handle.
Now, I'll admit I'm in the colonies, and I don't know much about 2 strokes, or old British bikes. Seems to me that at the least it's toasted bottom end bearinsg and possibly a damaged crank shaft.
Questions: Suggestions as to what caused this in the first place?
Does the story ring true?
If the bottom end is knocking, is it much to pull these engines apart?
How expensive is (and how hard to find) a crank shaft?
Regards,
Justin