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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leak down test
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<blockquote data-quote="Cyborg" data-source="post: 125346" data-attributes="member: 3426"><p>I’m not one to use the chemicals sold at the local auto parts store and think majority are snake oil. One of the things I do use is combustion chamber cleaner. When Honda introduced the 4 valve engines in 79 there were some situations where bikes would come in (usually after lots of in town riding) and the valve clearance was excessive. Long story short.....It eventually became evident that installing thicker shims to take up the clearance and not dealing with the carbon would lead to erratic idle or burnt exhaust valves once the bike was driven on the highway for an extended period of time. In a case where the leak down test suggests things are leaking past the valves and wind isn’t blowing out the crankcase breather, then I wouldn’t take an engine down until I had run combustion chamber cleaner through it and repeated the leak down test. </p><p></p><p>Not sure who makes it, but it was given the factory’s blessing.</p><p></p><p>[ATTACH=full]36572[/ATTACH]</p></blockquote><p></p>
[QUOTE="Cyborg, post: 125346, member: 3426"] I’m not one to use the chemicals sold at the local auto parts store and think majority are snake oil. One of the things I do use is combustion chamber cleaner. When Honda introduced the 4 valve engines in 79 there were some situations where bikes would come in (usually after lots of in town riding) and the valve clearance was excessive. Long story short.....It eventually became evident that installing thicker shims to take up the clearance and not dealing with the carbon would lead to erratic idle or burnt exhaust valves once the bike was driven on the highway for an extended period of time. In a case where the leak down test suggests things are leaking past the valves and wind isn’t blowing out the crankcase breather, then I wouldn’t take an engine down until I had run combustion chamber cleaner through it and repeated the leak down test. Not sure who makes it, but it was given the factory’s blessing. [ATTACH type="full"]36572[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leak down test
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