Author Topic: Still not starting - but what is this all about?  (Read 1354 times)

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Offline JerryRice

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Still not starting - but what is this all about?
« on: October 02, 2008, 12:48:24 PM »
I am still having a problem staring my 1974 CB350F.

I tool the advice of a member and sprayed carb cleaner
in the air filers. The bike started for a short time
and stalled.

I noticed that only the left two exhaust pies were hot-
the other two cold.

Seems gas is flowin to the carbs. Also, There is
spark on all four plugs.

This is crazy. The bike used to start no problem.
What is going on?

The Real JERRY RICE
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My Dream Bike
www.CB350F.com

Offline Johnny5

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Re: Still not starting - but what is this all about?
« Reply #1 on: October 02, 2008, 12:56:43 PM »
Something clogging the fuel system? Sounds like it's starving for fuel on the side that's staying cold.
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1971 CB350
1973 CB350F
2006 Harley Springer Classic

Offline JP74

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Re: Still not starting - but what is this all about?
« Reply #2 on: October 02, 2008, 01:16:32 PM »
how long has the bike been sitting?
how have you confirmed that fuel is getting to the carbs? 

76-cb750k, 75-cb360T, 71-cb750k,
73-cb750 AMEN hardtail, 
78-750k roller..cl350..cl450. kz400,gs750.  maybe more

Offline JerryRice

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Re: Still not starting - but what is this all about?
« Reply #3 on: October 02, 2008, 01:22:23 PM »
Bike was sitting for 2 weeks.
I confirm the fuel is getting to the carbs by pulling th
fuel line off the carbs.. yup its wet.

Also I removed the carbs and cleaned them out.
Re-conected the tank and turned the petcock on.
I have a clear fuel filter. The gas wqas pouring
through for a long time..confirming that the float
bowls were filling up.

The Real JERRY RICE
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My Dream Bike
www.CB350F.com

Offline JP74

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Re: Still not starting - but what is this all about?
« Reply #4 on: October 02, 2008, 01:32:12 PM »
have you tried pulling the float bowls off and measuring the amount of fuel?
float height set to specs?

you are getting strong spark on all four plugs?

76-cb750k, 75-cb360T, 71-cb750k,
73-cb750 AMEN hardtail, 
78-750k roller..cl350..cl450. kz400,gs750.  maybe more

Offline WFO

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Re: Still not starting - but what is this all about?
« Reply #5 on: October 02, 2008, 01:33:50 PM »
Bike was sitting for 2 weeks.
I confirm the fuel is getting to the carbs by pulling th
fuel line off the carbs.. yup its wet.

Also I removed the carbs and cleaned them out.
Re-conected the tank and turned the petcock on.
I have a clear fuel filter. The gas wqas pouring
through for a long time..confirming that the float
bowls were filling up
.


.




Well this doesn't mean the float bowls were filling up on the two cold cylinders there is a drain screw on the bottom of the carb bowls loosen that and confirm the bowls do have gas in them also try to start and pull the plugs and see if they are wet confirming gas is getting into the cylinders (then go from there) check for spark on those two cylinders
82 cb650 sc nighthawk - 78 kz 650 b

Offline JerryRice

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Re: Still not starting - but what is this all about?
« Reply #6 on: October 02, 2008, 01:51:09 PM »
The spark is not that strong across the board. However I am not sure what the normal output should look like.

I will check the float boals by unscrewing tonight - will report back
tomorrow thanks!
The Real JERRY RICE
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My Dream Bike
www.CB350F.com

Offline Sporkfly

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Re: Still not starting - but what is this all about?
« Reply #7 on: October 02, 2008, 02:03:21 PM »
Should have a bright blue spark.

Still sounds like a carb issue.
1977 CB550K
1979 GL1000 - Current project, winter '09-'10
1979 CX500
1976 Suzuki GT500 Titan

Offline JP74

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Re: Still not starting - but what is this all about?
« Reply #8 on: October 02, 2008, 02:13:49 PM »
def sounds like a carb issue.    how in depth did you clean the carbs?
76-cb750k, 75-cb360T, 71-cb750k,
73-cb750 AMEN hardtail, 
78-750k roller..cl350..cl450. kz400,gs750.  maybe more

Offline CB750F2

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Re: Still not starting - but what is this all about?
« Reply #9 on: October 02, 2008, 02:20:29 PM »
I suggest that if your float levels are ok and your plugs appear dry then check your low speed jets for clogging. Pat
Regards
Pat from Australia

Offline WFO

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Re: Still not starting - but what is this all about?
« Reply #10 on: October 02, 2008, 02:27:41 PM »
The spark is not that strong across the board. However I am not sure what the normal output should look like.

I will check the float boals by unscrewing tonight - will report back
tomorrow thanks!


I had a spark plug showing spark on a ATV it wouldn't start it ended up being a bad spark plug try switching plugs from a firing cylinder.
82 cb650 sc nighthawk - 78 kz 650 b

Offline Hush

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Re: Still not starting - but what is this all about?
« Reply #11 on: October 02, 2008, 02:31:31 PM »
+1 on the swapping the good plugs across to the cylinders not firing, also just a thing I do: drop a wee bit of gas into the cylinders that don't appear to be firing before you put plugs back in, if it fires with this form of backwoods fuel injection then yes you have proved its a carb problem. ;D
I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline JerryRice

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Re: Still not starting - but what is this all about?
« Reply #12 on: October 05, 2008, 12:00:23 PM »
Ok People. Thanks so much for backing me up with support trouble shooting this issue.
It seems to have been a loose kill switch connection. So far it starts. I may just
bypass the switch totally.
The Real JERRY RICE
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My Dream Bike
www.CB350F.com

Offline Johnny5

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Re: Still not starting - but what is this all about?
« Reply #13 on: October 05, 2008, 05:58:31 PM »
Be careful riding around without the killswitch.

Keep us updated on how the bike is doing.
www.kerosenecycles.com
1971 CB350
1973 CB350F
2006 Harley Springer Classic

Offline JerryRice

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Re: Still not starting - but what is this all about?
« Reply #14 on: October 06, 2008, 06:54:19 AM »
Yeah, maybe I will just put on an aftermarket switch.
The Real JERRY RICE
--------------------
My Dream Bike
www.CB350F.com