Posted by Konrad Viltersten on August 6, 2007, 3:44 am
The day before yesterday, i went on a short tour, about
100km and everything was as it's supposed to be.
Yesterday, i drove out, i noticed that even though the
bike accelerated, i didn't get this "woah!" increase in
speed. A little bit like if the gas didn't provide enough
fuel after a certain amount of degrees that the gas
handle has passed...
Also, i noticed that the choke had to be pushed in all the
way back towards the handle. Otherwise the engine
went far below 1000rpm and died.
First i thought that the engine was cold so i patiently
drove for about 10km but after that, the problem was
still there.
Today, i was was going back to the shop to shove the
stupid MC into an arbitrary dark hole of the salesman
but, guess what, everything is back to normal. Now,
assuming that i'm sane and sound, there must be
something i did or there's a hidden damage somewhere.
What could it be, provided the above description?
--
Vänligen
Konrad
---------------------------------------------------
Sleep - thing used by ineffective people
as a substitute for coffee
Ambition - a poor excuse for not having
enough sence to be lazy
---------------------------------------------------
Posted by Albrecht via MotorcycleKB.com on August 6, 2007, 8:50 am
Konrad Viltersten wrote:
>Also, i noticed that the choke had to be pushed in all the
>way back towards the handle. Otherwise the engine
>went far below 1000rpm and died.
Your carburetors are getting plugged up with dirt, gum, varnish, rust, etc.
Your Transalp does not have a real choke. It has a starting enrichener device
which is an air bypass valve that lets air go around the throttle butterfly.
As the air moves through the passage, it sucks gasoline straight out of the
float bowl.
http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6762
The starting enrichener valve is item #9 on the drawing
>First i thought that the engine was cold so i patiently
>drove for about 10km but after that, the problem was
>still there.
Most modern street motorcycles have what is called a "constant vacuum",
"constant velocity", or "diaphragm carburetor".
Some people will just call it a "CV" carburetor.
The CV carburetor has very small idle mixture ports and passages which are
easily plugged up with gum and varnish from evaporated gasoline, or rust and
debris that have accumulated in the gas tank.
Once these passages get plugged up, the engine won't idle unless you use the
"choke" I described above.
The first step insolved your dirty carburetor problem will be to turn the
fuel petcock valve to the OFF position and remove the sediment bowl and clean
it out with fresh gasoline.
http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6766
Item #12 is the sediment bowl.
Get some clear carburetor cleaner that contains acetone, toluene, methyl
alcohol, xylene, etc and add about four ounces to a full tank of gasoline and
go for a ride to clean dirt and sediment and varnish out of your carburetors.
Ask the man at the auto parts store what to use. Fuel system cleaners
intended for fuel injectors won't do what you want, they are mostly petroleum
distillate for
lubricating the injector.
Be ready to adjust the idle speed screws. Once the carburetors are cleaned
out, the idle speed may be too high.
http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6762
Each carburetor has its own idle speed screw, item #7 on the drawing.
Adjusting them separately may cause an imbalance between the carburetors.
Readjusting the screws so both throttle butterflies are open the same amount
is called "synchronizing" the carburetors.
--
Message posted via MotorcycleKB.com
http://www.motorcyclekb.com/Uwe/Forums.aspx/bike/200708/1
Posted by Fake Name on August 6, 2007, 3:34 pm
On Mon, 06 Aug 2007 12:50:04 GMT, "Albrecht via MotorcycleKB.com"
>Readjusting the screws so both throttle butterflies are open the same amount
>is called "synchronizing" the carburetors.
Great stuff in your post there. I would just like to mention that to
truly sync the carbs one needs a carb syncing tool. One can be made
out of a long 2-3 meter tube, a yard stick, two fuel filters, and a
small amount of ATF. The traditional type uses mercury in tubes. The
newer ones use diaphragms connected to springs with a dial on them.
Ref:
http://www.powerchutes.com/manometer.asp
http://www.ascycles.com/detail.aspx?ID !46
http://771doug.netfirms.com/synch_page.html
Posted by Konrad Viltersten on August 7, 2007, 4:24 am
Albrecht via MotorcycleKB.com wrote/skrev/kaita/popisal/schreibt :
> Konrad Viltersten wrote:
>> Also, i noticed that the choke had to be pushed in all the
>> way back towards the handle. Otherwise the engine
>> went far below 1000rpm and died.
> Your carburetors are getting plugged up with dirt, gum, varnish,
> rust, etc.
> Your Transalp does not have a real choke. It has a starting
> enrichener device which is an air bypass valve that lets air go
> around the throttle butterfly. As the air moves through the passage,
> it sucks gasoline straight out of the float bowl.
> http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6762
> The starting enrichener valve is item #9 on the drawing
>>
>> First i thought that the engine was cold so i patiently
>> drove for about 10km but after that, the problem was
>> still there.
> Most modern street motorcycles have what is called a "constant
> vacuum", "constant velocity", or "diaphragm carburetor".
> Some people will just call it a "CV" carburetor.
> The CV carburetor has very small idle mixture ports and passages
> which are easily plugged up with gum and varnish from evaporated
> gasoline, or rust and debris that have accumulated in the gas tank.
> Once these passages get plugged up, the engine won't idle unless you
> use the "choke" I described above.
> The first step insolved your dirty carburetor problem will be to turn
> the fuel petcock valve to the OFF position and remove the sediment
> bowl and clean it out with fresh gasoline.
> http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6766
> Item #12 is the sediment bowl.
> Get some clear carburetor cleaner that contains acetone, toluene,
> methyl alcohol, xylene, etc and add about four ounces to a full tank
> of gasoline and go for a ride to clean dirt and sediment and varnish
> out of your carburetors.
> Ask the man at the auto parts store what to use. Fuel system cleaners
> intended for fuel injectors won't do what you want, they are mostly
> petroleum distillate for
> lubricating the injector.
> Be ready to adjust the idle speed screws. Once the carburetors are
> cleaned out, the idle speed may be too high.
> http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6762
> Each carburetor has its own idle speed screw, item #7 on the drawing.
> Adjusting them separately may cause an imbalance between the
> carburetors.
> Readjusting the screws so both throttle butterflies are open the same
> amount is called "synchronizing" the carburetors.
Great info! Thanks!
--
Vänligen
Konrad
---------------------------------------------------
Sleep - thing used by ineffective people
as a substitute for coffee
Ambition - a poor excuse for not having
enough sence to be lazy
---------------------------------------------------
Posted by Erronous Monk on August 8, 2007, 1:11 am
Clean the air filter.
:-)
> Albrecht via MotorcycleKB.com wrote/skrev/kaita/popisal/schreibt :
>> Konrad Viltersten wrote:
>>
>>> Also, i noticed that the choke had to be pushed in all the
>>> way back towards the handle. Otherwise the engine
>>> went far below 1000rpm and died.
>>
>> Your carburetors are getting plugged up with dirt, gum, varnish,
>> rust, etc.
>>
>> Your Transalp does not have a real choke. It has a starting
>> enrichener device which is an air bypass valve that lets air go
>> around the throttle butterfly. As the air moves through the passage,
>> it sucks gasoline straight out of the float bowl.
>>
>> http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6762
>>
>> The starting enrichener valve is item #9 on the drawing
>>>
>>> First i thought that the engine was cold so i patiently
>>> drove for about 10km but after that, the problem was
>>> still there.
>>
>> Most modern street motorcycles have what is called a "constant
>> vacuum", "constant velocity", or "diaphragm carburetor".
>>
>> Some people will just call it a "CV" carburetor.
>>
>> The CV carburetor has very small idle mixture ports and passages
>> which are easily plugged up with gum and varnish from evaporated
>> gasoline, or rust and debris that have accumulated in the gas tank.
>>
>> Once these passages get plugged up, the engine won't idle unless you
>> use the "choke" I described above.
>>
>> The first step insolved your dirty carburetor problem will be to turn
>> the fuel petcock valve to the OFF position and remove the sediment
>> bowl and clean it out with fresh gasoline.
>>
>> http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6766
>>
>> Item #12 is the sediment bowl.
>>
>> Get some clear carburetor cleaner that contains acetone, toluene,
>> methyl alcohol, xylene, etc and add about four ounces to a full tank
>> of gasoline and go for a ride to clean dirt and sediment and varnish
>> out of your carburetors.
>>
>> Ask the man at the auto parts store what to use. Fuel system cleaners
>> intended for fuel injectors won't do what you want, they are mostly
>> petroleum distillate for
>> lubricating the injector.
>>
>> Be ready to adjust the idle speed screws. Once the carburetors are
>> cleaned out, the idle speed may be too high.
>>
>> http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id 6762
>>
>> Each carburetor has its own idle speed screw, item #7 on the drawing.
>> Adjusting them separately may cause an imbalance between the
>> carburetors.
>>
>> Readjusting the screws so both throttle butterflies are open the same
>> amount is called "synchronizing" the carburetors.
> Great info! Thanks!
> --
> Vänligen
> Konrad
> ---------------------------------------------------
> Sleep - thing used by ineffective people
> as a substitute for coffee
> Ambition - a poor excuse for not having
> enough sence to be lazy
> ---------------------------------------------------
>
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>way back towards the handle. Otherwise the engine
>went far below 1000rpm and died.