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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine swap: any advice?
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<blockquote data-quote="Aasland" data-source="post: 1129746" data-attributes="member: 14773"><p>Bah. One good cylinder, one mediocre (19%, through the rings and exhaust valve), and two with no compression (through the intake valves).</p><p></p><p>"GREAT COMPRESSION" my @ss.</p><p></p><p>However .. seeing that I have another bike with a good head on it .. I'm thinking .. why not swap heads? It looks trivial, much easier than paying a couple hundred to send the engine back and start over, or cracking open the transmission. It can't be much worse than when I rebuilt the KZ1100 head and put new pistons in it ... maybe $100 in gaskets and new bolts.</p><p></p><p>Thoughts?</p><p></p><p>EDIT: After a beer my brain started working better.</p><p></p><p>I did check the valve clearance; the leaky valves did have some clearance there so they weren't much worn, and not held open by the camshaft. The timing chain was OK, so it hadn't skipped teeth, presumably the valves aren't bent.</p><p></p><p>Why not pull the head, clean it up, put it back on with the old gasket and bolts, re-test the leakdown? If all is good ... pull it off, get a new gasket and bolts and button it up for good? Then I'll also get to look at the cylinders.</p></blockquote><p></p>
[QUOTE="Aasland, post: 1129746, member: 14773"] Bah. One good cylinder, one mediocre (19%, through the rings and exhaust valve), and two with no compression (through the intake valves). "GREAT COMPRESSION" my @ss. However .. seeing that I have another bike with a good head on it .. I'm thinking .. why not swap heads? It looks trivial, much easier than paying a couple hundred to send the engine back and start over, or cracking open the transmission. It can't be much worse than when I rebuilt the KZ1100 head and put new pistons in it ... maybe $100 in gaskets and new bolts. Thoughts? EDIT: After a beer my brain started working better. I did check the valve clearance; the leaky valves did have some clearance there so they weren't much worn, and not held open by the camshaft. The timing chain was OK, so it hadn't skipped teeth, presumably the valves aren't bent. Why not pull the head, clean it up, put it back on with the old gasket and bolts, re-test the leakdown? If all is good ... pull it off, get a new gasket and bolts and button it up for good? Then I'll also get to look at the cylinders. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine swap: any advice?
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