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Discussion Starter · #1 ·
I can't get my cb160 to idle corectly. I have done a full tune but the problem continues. no matter what adjustment I do to the carb the bike will either rev up to 2000rpm or more, or it will just stall. There is no happy medium. Also when I ride the bike it has a bit less power than it should top speed 55mph and when ever I give it a lot of throttle and let go it will stay in high rpm's as soon as I push in the clutch, it will do this in any gear; and it will slowly climb back down the rmps to idle and than to stall. The only way I can make it idle is by continualy giving it a quick jerk in the throttle, if I try to give it throttle slowly it will still stall only a quick jerk works to keep it running no matter how I adjust the carbs.
> > >
> > > I have also had a fantom problem with my spark plugs. with in the last 20days I have changed my spark plugs 3 times. For some reason the spark plugs will not spark, the motor will not start and when I put the spark plug to the engine it shows no spark so I replaced them and than the bike fired right up, but after 20days I had to do this again and when I swap the old spark plugs again they still will not fire but the new ones will, How can I go throug so many spark plugs? The top of the spark plugs is deep black but in my opinio they should spark, there is no corosion, carbon deposit, and the gap is perfect.
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> > > Below I listed all of the things I checked or replaced.
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> > > -compression test: 155psi at each cyliner
> > > -cam chain djusted
> > > -valve adjused to specs
> > > -points very in realy good condition so I just adjusted them
> > > -iginition timing was djusted
> > > -brand new UNI FILTER pods
> > > -carburator was diped in carb cleaner an all passages were cleaned
> > > -carburator main jet size 90, secondary jet 38, idle mixture screw is set at 1 1/4 turns out
> > > -brand new battry fully charged
> > > -all new engine gaskets, and oil seals
> > > -and much more tune up stuff that should not be related to my current problems
> > >
> > > At this point I'm not sure what to do and how to check other things to get this running right. Could I have a bad condensor? bad coil? bad igintion system? carburetor still dirty? float set wrong? bad wires or ground? and what could cause my spark plug problems too, that is jut crazy to me that I would go trough 3 sets of spark plugs. Any help on this would be great, I will buy someone a beer if I can get this bike running right.
 

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Sensei
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27,180 Posts
From your list....
155 PSI is at the lower end of the allowable specs, it should be 170....
When you 'adjusted the points", did you just gap them?
It fires EXACTLY on LF and F ...correct?
Did you clean and lube the advance mechanism?
Are the floats at 21mm settings?
Are you sure there are no air leaks at the intake manifold joints? (I add gaskets to insure this)
Are the carbs synchronised?
Is the head properly torqued to specs?

Take the pods off and see if it doesn't run better/faster....I believe you are too rich due to air restriction.....Plugs should be tan/light brown, not black....
 

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Discussion Starter · #3 ·
thanks for the info, just some quick questions to your comments.

it fires Exactly on LF and F? what do you mean by this? do you mean if it fires on the right and left cyclinder? I did set the timing on the magnito to the F mark when ever the points were opening up, just like the book said to do it, I did it with a test lamp, as soon as the F mark hit the spot the test ligth would light up when I touched it to the points wire, So I belive this is correct.

I will have to double check on the air leaks, but not sure how to make sure on that, sould put some silicone on them to make sure? they just use orings right now.

I can't realy sinc the carbs because I can't get it to idle right, acording to the book you should sinc them while the bike is a idle, but I can't get it to idle right.

The compression was taken when the bike was cold so it should be higher, I just made sure that it is not realy bad because the bike sat for a long time. but I think if I did it when it is hot, the compression should be much higher, but I will double check on that.

Let me know if there is someting I might be missing on this.
 

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Sensei
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Sounds like you are on the right track.... we'll get it sorted out..... :D :D
 

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Sounds rather similar to the problems I was (am) having with my CB200. I just got my cylinders back from being bored. I hope to get it all put back together soon. If I figure out exactly what my problem was, I'll be sure to post here.

Best of Luck,
Kenolds.
 
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