1974 Honda CB 100 Logo
Posted on Aug 16, 2009
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1974 cb550- starting

I have replaced the battery, battery cables, changed the oil, new sparkplugs, and the bike will turn over but won't start. The bike hasn't ran in years I picked it up off of ebay.

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  • Posted on Aug 16, 2009
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Engines don't run because they either have no gas in the combustion chamber or no spark to ignite it. So determine which is missing.

First, validate that you have a spark at the spark plugs

If you pull the plugs again, you can not only check for spark, but see if they are 'wet' from getting gas.

But most likely, your problem may be associated with the carburetors - sitting for long period turns the gas to varnish and they are probably gummed up.
Solution is to strip and clean them.

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  • Expert 232 Answers
  • Posted on Aug 16, 2009
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So my bike was riding fine up to Thursday night. I just changed the oil on Sunday and every time I rode it there were no issues except for the bike taking a while to turn over about half way through a 4...

As I'm sure you suspect, changing the oil and sparkplugs should have nothing to do with the symptoms you've outlined. The symptoms "seem" to indicate a problem in the charging system. Either the battery is in need of replacement or the regulator is fried. One way to test which is at fault is to jump start the bike (be VERY careful doing this as a car battery will fry your system if you connect it wrong). Once it is started, remove the jumper cables. If you need to rev the engine slightly to keep it running, this is normal as a dead battery is a big draw on the electrical charging system. If you can, have a friend hold the bike RPM's around 1500 and disconnect one of the battery leads on the bike's battery. If the bike continues to run (my suspicion is it will), you have a bad battery. If the bike will not run, then the charging system is the culprit. It could be something as simple as a regulator or as complicated as the generator (inside the engine).
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Sparkplugs need replaced

Here are some instructions:

1. open hood
2. disconect battery
3. remove sparkplugs cable
3. use a torque ranch to remove sparkplugs (turn to left)
4. replace with new sparkplugs
5. connect cables
6. connect battery

Start car and check for missfires

Good luck!!!
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Interchange the sparkplugs in the cables:
-Same plug give sparks: replace the spark plugs.
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1974 honda cb550 will not run?

• The first thing to do with ANY engine that has sat for any longer than a couple of months is to dump ALL the fuel in the tank and carb(s). ALL OF IT !! You'll want to refill with some high priced fuel that has fuel system cleaners (Like Chevron with Techron) not becasue you need high-test fuel, but because you need the cleaners. It's ether that or disassemble the carbs and clean out jets you can't find much less see. Your choice. The carb kits alone will cost you about $50 so a tank of high-test is looking pretty good, huh?

• Now the fact that you tried to crank the engine with old fuel has fouled the sparkplugs. All of them. Go buy all new sparkplugs.

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