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Discussion Starter #1
Hey everyone, hopefully somebody here is familiar with these old bikes!

Long story short, I recently bought a beautiful 1976 Honda 550 Super Sport, and am trying to fully restore it. The bike seems to be in great condition as far as the frame an parts go, but it is not running (Consistently) yet. The engine turns over, and I have been able to get it running via push start (but the bike only got into 3rd gear and had little power). I would like to get this thing running well, but am new to the motorcycle scene and need some help!

Background info
:This bike has been sitting for quite a few years and has never been rebuilt. The odometer reads 19000 miles. I have cleaned the carburetors, replaced the fuel filters, purchased a new battery, and replaced the starter, but the bike still is not running well. I also bought new spark plugs, but have not been able to replace all of four of them yet because I don't have a socket that will fit into the two middle spark plug wells.
*no tuning has been done yet.

Finally, the bike has four cylinders, and I noticed that when finally I did get the bike idling for a minute or two, the exhaust pipe on only one of the cylinders (far right) became hot, and the other three remained cool. Is this normal for a four cylinder engine? Or is the bike currently running on just one cylinder?

thanks, I appreciate the feedback.
 

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Discussion Starter #3
Yes, it seems that way to me as well. Any ideas regarding the causes of that issue, or how to fix it?
 

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Six-String Jockey
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1,858 Posts
TB,
Start with the basics. Pull the spark plugs out, reconnect them to the plug wires, and lay them on the cylinder head. Try and start the engine. Are they sparking?

NO - Diagnose the problem with the ignition. Bad plugs? Coils? Wires? Etc.

YES - Check the compression on each cylinder with a compression gauge. Each cylinder should be above 110 pounds of compression.

Let us know what you find from those two tests and we can help further.
 
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