42
Remove the carbon from the piston, cylinder head and exhaust ports by careful
scraping, At the same time remove carbon deposits from piston ring grooves
(preferably with an old broken piston ring). When replacing the piston rings fit the
rings into the same grooves in which they were before being removed. Having
scraped off the carbon, polish the parts in question and before reassembling wash
them in clean petrol or paraffin.
Fig. 23. Exhaust Silencer - sectional view