Power missing-Run, baby, run!

If it's broken or just needs tweaked

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CAMM
Posts: 4
Joined: Fri Jul 26, 2013 4:49 pm

Power missing-Run, baby, run!

Postby CAMM » Tue Oct 11, 2016 3:34 pm

I am having an issue and coming to this great group for help. I have searched the forum without an finding an answer (unlike usual).

When I ride my bike after about 5 minutes into the ride I lose most of the power and I have to give it much more throttle than usual to keep it running (and it runs poorly). It feels like the bike starts running on only two cylinders even though I cannot confirm that is what is actually happening. If I can keep it running for a few more minutes then all of the sudden the power returns and it shoots off like a rocket. I replaced the coils thinking this was the issue, but it did not solve the problem. It only seems to happen once the bike has warmed up. Any ideas of how to resolve this?

Thanks!
CAMM

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Folsoml
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Joined: Sat Apr 07, 2012 9:02 pm
Location: North Florida

Re: Power missing-Run, baby, run!

Postby Folsoml » Tue Oct 11, 2016 4:31 pm

I had a CB900C that would do that. The problem was in the pulse generator. Apparently when it got hot, something shorted in it and it made only two cylinders work. Once I replaced it, it ran like a scalded dog.
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My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,

CAMM
Posts: 4
Joined: Fri Jul 26, 2013 4:49 pm

Re: Power missing-Run, baby, run!

Postby CAMM » Tue Oct 11, 2016 10:32 pm

Thanks Folsoml, I will replace the pulse generators. Any ideas of where to buy new ones?

CAMM

cb650
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Re: Power missing-Run, baby, run!

Postby cb650 » Wed Oct 12, 2016 5:35 am

I had one to that would go out when hot. Try ebay or tom in parts section.
Did you clean the tank out?!?!?!?!

CAMM
Posts: 4
Joined: Fri Jul 26, 2013 4:49 pm

Re: Power missing-Run, baby, run!

Postby CAMM » Wed Oct 12, 2016 12:39 pm

I could not find one on eBay. I sent Tom a message. Hopefully, he has one.

CAMM

cb650
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Re: Power missing-Run, baby, run!

Postby cb650 » Wed Oct 12, 2016 2:16 pm

make sure that is the problem could be a coil or ignitor also.
Did you clean the tank out?!?!?!?!

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tario
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Re: Power missing-Run, baby, run!

Postby tario » Fri Oct 14, 2016 8:15 am

If you pull the plugs after a few minutes of poor running you should be able to figure out what cylinders are the problem. Black or gassy smells will tell you there is something off. If your plugs are pure white with no golden or black/brown colour it likely isn't ignition problems.(right?) It wouldn't hurt to make sure your carb boots are tight too. I hear vacuum leaks do odd things to the engine.
1979 cb650
1980 cb650

CAMM
Posts: 4
Joined: Fri Jul 26, 2013 4:49 pm

Re: Power missing-Run, baby, run!

Postby CAMM » Tue Nov 22, 2016 5:04 pm

I thought I would post an update. I purchased a used pulse generator from Tom and installed it. It seems to have remedied the problem. Thanks guys for your help!

CAMM

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Folsoml
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Joined: Sat Apr 07, 2012 9:02 pm
Location: North Florida

Re: Power missing-Run, baby, run!

Postby Folsoml » Wed Nov 23, 2016 8:09 am

Good to hear!
Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,


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