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Old 05-28-2013, 08:35 AM   #1
Woogies OP
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Random Engine cut-outs

So I have a 1973 CB125s. Great around town bike, but lately I've been having some problems. I thought I fixed these before, but they have returned.

Essentially I was driving along (~40mph), and suddenly the engine shuts off. Sometimes it does this when I pull the clutch as well. I have to pull over and it takes an unusual amount of kicking to get her started again?

Any ideas?

Woogies screwed with this post 05-28-2013 at 09:57 AM
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Old 05-28-2013, 09:23 AM   #2
Yossarian™
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Here are a few.

Fouled spark plug.
Gunked up carburetor.
Dirty air filter.

All are dead simple to check on this particular bike.
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Old 05-28-2013, 09:59 AM   #3
Woogies OP
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Quote:
Originally Posted by Yossarian™ View Post
Here are a few.

Fouled spark plug.
Gunked up carburetor.
Dirty air filter.

All are dead simple to check on this particular bike.

I've been putting off checking/cleaning the carb, It's simple, but the problem is my laziness. . I have a feeling that is the problem, as it was run using old fuel before I got it. It also sat for a long time before that

I'll definately check the air filter and plug too.
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Old 05-28-2013, 11:56 AM   #4
Suzuki Phil
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Could be the ignition coil, heat will cause expansion and thus an open coil.

Good luck,

SP
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Old 05-28-2013, 12:31 PM   #5
Jan from Finland
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+1 for ignition wiring. Especially if the clutch cable goes anywhere near by.
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Old 05-28-2013, 12:58 PM   #6
SkiBumBrian
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Adjust your valves and check compression before trying to tune your carb. Tight valves will cause said symptoms and hard starting.
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Old 06-10-2013, 10:43 AM   #7
Woogies OP
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Sorry for bringing back an almost dead thread...

What am I checking for on the ignition coil and what does the clutch cable have to do with it?

Would tight valves cause problems all the time though? My problem is random.
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Old 06-10-2013, 01:44 PM   #8
RFVC600R
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My valve seat came loose and bent my left exhaust valve. The bike wouldn't start but sometimes it would. It was acting just like tight valves. That one valve is ever so slightly open and it would be so hard to start. And when it did start, it soundling like a rachet being spun by a drill gun.
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