Grand Prix 500
Main Motorcycle: 1973 TR7
Join Date: Jul 2012
Location: Hickory Creek, TX
|Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.|
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Does this apply when cams and followers have been re-ground and covered with cam lube?
I have been advised to run the engine for 20 minutes (2 x 10 minute intervals) at 3-4000rpm on the stand.
After a full rebuild I've always got the engine started and first got the carbs set up (mixture, tickover, synch), then strobed the timing, and in the meantime checked for proper oil return, any oil, petrol or exhaust gas leaks etc, and only after all this was completed even thought about setting out for a ride.By that time the engine would have run for some time, gently.
The normal procedure to bed in cam and tappets is to run at no less than 2000 rpm (some will say 2500rpm) for the first 20 minutes.You can stop the engine completely,then re-start;just don't have it running slowly.
You get more splash lubrication than you would at idle,and over-the-nose load on the cam lobe is reduced because valve-gear inertia opposes the valve spring at full lift.
Running your engine on the stand at 2000 rpm won't help the rings,and you'd also need cooling fans.
You would be better to run it down the road and keep above 2000 rpm.You just need to find a good section of clear road.
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