SOHC.co.uk Forums > CB750
Engine smoking
mike the bike:
--- Quote --- find "hilly areas"
--- End quote ---
Does it give the same advice in the Dutch manuals I wonder.
Chris400F:
This is what the 400 Owner's Manual has to say about 'Breaking In', suspect the principle is the same for the 750.
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Johnwebley:
--- Quote from: mike the bike on October 17, 2016, 08:36:02 PM ---
--- Quote --- find "hilly areas"
--- End quote ---
Does it give the same advice in the Dutch manuals I wonder.
--- End quote ---
maybe all bikes should be run in either in Wales,or the Highlands of Scotland ????
K2-K6:
As Pete has said, it may take a few miles to get it right as the rings need to wear to fit the bores.
Looks like you've done the right things by getting the bores prepped as well. When new rings go onto existing pistons and used bores they just don't fit well enough initially to hold the compression up and the oil down below the pistons. They are then reliant on the cross hatching to literally grind the high points off the rings until they are properly matched to the bores. This will take a few miles to happen (probably as Pete has experienced around 100) give or take a bit.
You've an additional consideration using bores and pistons with some miles already on them as there will also be a small amount of wear compared to original new status, so the tolerances there will be more generous. I know there's always discussion about oil type (at any stage of an engines life) but don't feel in this case it will make much difference to you.
Also you are not running in a new motor so as long as there's nothing wrong with the assembly then you don't really need to be careful (apart from making sure you don't overheat it) during initial use. The care needed with brand new engines is principally centered around piston and bore clearance to avoid any heat build up causing any localised seizure of the piston skirt along with subsequent pickup to cause damage.
For your motor it needs to be used over its normal operational range and get some mileage on it to get the rings bedded in before the crosshatching is worn smooth as it won't happen after those sharp edges loose their bite.
I'd get out and ride it, then change the oil and filter at 500miles.
yozzer74:
Thanks for that info k2_k6 makes me feel a little better about it .
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