79 CB650 Running only on 3 Cylinders

If it's broken or just needs tweaked

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cpower
Posts: 6
Joined: Fri Jul 06, 2012 3:08 pm

79 CB650 Running only on 3 Cylinders

Postby cpower » Sat Jul 08, 2017 12:10 pm

Okay newbie motorcycle owner.

Only 3 of the 4 pipes get hot when idling prior to riding (When sitting on it, it's the 2nd from the left)

I've recently replaced the spark plugs, and cleaned the jets/carbs out two years ago.

What else should I be looking at?

jcasey007
Posts: 225
Joined: Sun Jan 13, 2013 3:38 pm
Location: Stratford Upon Avon - UK

Re: 79 CB650 Running only on 3 Cylinders

Postby jcasey007 » Sat Jul 08, 2017 3:56 pm

I assume you have checked you have a spark on number 2?

then check for vacuum leak on number 2 carb to start with if not a split carb to head rubber, do a compression test on #2

MEHall
Posts: 373
Joined: Mon Nov 15, 2010 8:25 am
Location: Sweden

Re: 79 CB650 Running only on 3 Cylinders

Postby MEHall » Sun Jul 09, 2017 8:32 am

Easiest to start with is the ignition, check the sparkplug and the wires. Next is to check if you get fuel into that cylinder, that is a bit more difficult but not impossible. :wink:






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Folsoml
Posts: 1400
Joined: Sat Apr 07, 2012 9:02 pm
Location: North Florida

Re: 79 CB650 Running only on 3 Cylinders

Postby Folsoml » Sun Jul 09, 2017 7:23 pm

Carbs clean two years ago? Has it run since then?
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