Posted by jamesbittner on May 3, 2006, 10:46 am
I have been working on a 1972 Honda CB350 for a few days now.
The timing was set, the carbs are cleaned(twice), oil has been
replaced.
The problem is when i go to give it gas, most times the engine does not
respond.
It just sits at 1200 rpms no mater how much i crank on the throttle.
When i release the throttle it dies. Occasionally right after starting
up the bike, I can get the engine to reve. This sounds much better
after setting the timing.
When I was setting the timing, I opened the alternator case, and about
1 quart of oil drained out. From my manual it was apparent that only a
small amount of oil was suppose to come out.
I am not sure if this is a large problem, or just typical with a old
bike.
The bike is just not being consistent, I can adjust things till it
starts sounding good. Then when i hop on, it just holds at 1200rpms and
has no power when it is in gear. I have researched this online and come
up with a long list of things to check, (compression, carb sync, engine
gasket). But these are just uneducated guesses as I am just starting to
wrench on these machines.
Anyone have a good suggestion on what I should check/fix next?
Any help would be appreciated.
Thanks,
Posted by Rayvan on May 3, 2006, 6:46 pm
jamesbittner@gmail.com wrote:
> I have been working on a 1972 Honda CB350 for a few days now.
> The timing was set, the carbs are cleaned(twice), oil has been
> replaced.
> The problem is when i go to give it gas, most times the engine does not
> respond.
> It just sits at 1200 rpms no mater how much i crank on the throttle.
> When i release the throttle it dies. Occasionally right after starting
> up the bike, I can get the engine to reve. This sounds much better
> after setting the timing.
> When I was setting the timing, I opened the alternator case, and about
> 1 quart of oil drained out. From my manual it was apparent that only a
> small amount of oil was suppose to come out.
> I am not sure if this is a large problem, or just typical with a old
> bike.
> The bike is just not being consistent, I can adjust things till it
> starts sounding good. Then when i hop on, it just holds at 1200rpms and
> has no power when it is in gear. I have researched this online and come
> up with a long list of things to check, (compression, carb sync, engine
> gasket). But these are just uneducated guesses as I am just starting to
> wrench on these machines.
> Anyone have a good suggestion on what I should check/fix next?
> Any help would be appreciated.
Sounds to me like your main jets are clogged...
You say you cleaned the carbs, but did you pull out the jets to see if
they can actually (ahem) pass gas?
--
Rayvan
Posted by jim rozen on May 3, 2006, 8:28 pm
says...
>You say you cleaned the carbs,
Err, he might actually specify what he *did* to clean them.
>but did you pull out the jets to see if
>they can actually (ahem) pass gas?
Air leak between carb and head
CV diaphragm(s) holed
Fuel level in bowl too low, from
Clogged fuel screen in petcock or
Internally collapsed fuel line, or
Needle valve not opening to let bowl fill.
My CL360 had that problem, but only on one carb.
I drove it home from buying it thinking, wow, this
bike's a bit of a dog, but heck I'm used to riding
a 650.
Went to tune it up, pulled one plug wire and the idle
stayed the same - put that one back on and pulled the
other side off. Bike died on the spot.
One carb was bone-dry, and obviously had been so
for years. Once I had it running on both lungs it
was, well, a fair bike. Except for the handling.
Jim
--
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Posted by Shep© on May 4, 2006, 6:53 pm
On 3 May 2006 07:46:16 -0700 Too Much Ying and you will Pay With Yang
then jamesbittner@gmail.com sent this :
>I have been working on a 1972 Honda CB350 for a few days now.
>The timing was set, the carbs are cleaned(twice), oil has been
>replaced.
>The problem is when i go to give it gas, most times the engine does not
>respond.
>It just sits at 1200 rpms no mater how much i crank on the throttle.
>When i release the throttle it dies. Occasionally right after starting
>up the bike, I can get the engine to reve. This sounds much better
>after setting the timing.
>When I was setting the timing, I opened the alternator case, and about
>1 quart of oil drained out. From my manual it was apparent that only a
>small amount of oil was suppose to come out.
>I am not sure if this is a large problem, or just typical with a old
>bike.
>The bike is just not being consistent, I can adjust things till it
>starts sounding good. Then when i hop on, it just holds at 1200rpms and
>has no power when it is in gear. I have researched this online and come
>up with a long list of things to check, (compression, carb sync, engine
>gasket). But these are just uneducated guesses as I am just starting to
>wrench on these machines.
>Anyone have a good suggestion on what I should check/fix next?
>Any help would be appreciated.
>Thanks,
Do you have a Manual for the bike?
Are the carbs the,"Constant Velocity" type?
--
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Posted by Bruce Richmond on May 5, 2006, 8:58 pm
jamesbittner@gmail.com wrote:
> I have been working on a 1972 Honda CB350 for a few days now.
> The timing was set, the carbs are cleaned(twice), oil has been
> replaced.
> The problem is when i go to give it gas, most times the engine does not
> respond.
> It just sits at 1200 rpms no mater how much i crank on the throttle.
> When i release the throttle it dies. Occasionally right after starting
> up the bike, I can get the engine to reve. This sounds much better
> after setting the timing.
> When I was setting the timing, I opened the alternator case, and about
> 1 quart of oil drained out. From my manual it was apparent that only a
> small amount of oil was suppose to come out.
> I am not sure if this is a large problem, or just typical with a old
> bike.
> The bike is just not being consistent, I can adjust things till it
> starts sounding good. Then when i hop on, it just holds at 1200rpms and
> has no power when it is in gear. I have researched this online and come
> up with a long list of things to check, (compression, carb sync, engine
> gasket). But these are just uneducated guesses as I am just starting to
> wrench on these machines.
> Anyone have a good suggestion on what I should check/fix next?
> Any help would be appreciated.
> Thanks,
If I read you right you are saying that when you crank the throttle
open it is like nothing happens. That being the case the first thing I
would check is the diaphrams in the carbs. The bike has CV carbs.
With them there is no direct connection between the throttle cable and
the carb slide. The slides are actually opened by vacume, which keeps
you from bogging the engine by wacking the throttle open. If the
diaphram is leaking the vacume can't lift the slide. I suspect the
reason it sometimes revs right after starting is because the choke
(actually an enrichment circuit) lifts the slide directly to provide a
high speed idle.
Bruce Richmond
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> The timing was set, the carbs are cleaned(twice), oil has been
> replaced.
> The problem is when i go to give it gas, most times the engine does not
> respond.
> It just sits at 1200 rpms no mater how much i crank on the throttle.
> When i release the throttle it dies. Occasionally right after starting
> up the bike, I can get the engine to reve. This sounds much better
> after setting the timing.
> When I was setting the timing, I opened the alternator case, and about
> 1 quart of oil drained out. From my manual it was apparent that only a
> small amount of oil was suppose to come out.
> I am not sure if this is a large problem, or just typical with a old
> bike.
> The bike is just not being consistent, I can adjust things till it
> starts sounding good. Then when i hop on, it just holds at 1200rpms and
> has no power when it is in gear. I have researched this online and come
> up with a long list of things to check, (compression, carb sync, engine
> gasket). But these are just uneducated guesses as I am just starting to
> wrench on these machines.
> Anyone have a good suggestion on what I should check/fix next?
> Any help would be appreciated.