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Old 10-08-2004, 09:55 AM   #1
Tech Rookie
Join Date: May 2004
Location: Melbourne
Posts: 16
Default When to change crankshaft

I have got a Novarossi race 21,
when do I need to change the conrod, and when do I need to change the crankshaft.
Eric2004 is offline   Reply With Quote
Old 10-08-2004, 10:40 AM   #2
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Join Date: Mar 2004
Location: Australia
Posts: 167

crankshafts are probably the most durable part of the engine....

The parts you will most likely need to replace are:

-Piston & Liner
-Connecting rod (integrated bushings)
-Front & Rear bearings

You will know when the piston and liner need replacing, the compression will drop, the engine won't have the "edge" it once had, and idling may be unreliable.

I always replace the conrod at the same time as the piston and Liner, as the bushings do wear and get sloppy.

The crankshaft and wrist pin/gudgeon pin are made from extremely hard steel and should last almost indefinately if properly maintained.

The bearings can last a few rebuilds, if they are kept clean and no dirt has been able to enter...

You can't really put a label on an engine stating the life, it will vary with fuel used, application, maintenence, etc.
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