Stuttering at constant speed
 

Hi there,

My bike does have problems with constant speeds.
When I am cruising at speeds like 50mph and 30mph the bike stutters a little.
Like I am playing with the gas constant.
with 30 its stutters harder then 50.
Bike acceleration is fine. The bike drove a total of 17 945 miles.

Who knows what this can be and how I can solve it?

Thanks. :icon_bike:

im guessin get a carb sync.

O, and btw. it looks like it happens with between ca. 4500 and 5500 rpm

Look into the side door and see if there is a piece of rubber above the spark plug wires which goes between the wires/engine and the air box.

After that, take your spark plugs out and see what they look like. Take a picture and upload it here if you can.

OK I checked the bougie most to the right.
this is how it looks:

http://img263.imageshack.us/img263/7763/99525960.th.jpghttp://img54.imageshack.us/img54/1185/68662259.th.jpghttp://img35.imageshack.us/img35/8435/56018673.th.jpg

That one looks good.

Are any of the others black or white, or nice and brown like this one ?

I don't know yet.
It's hard to get them out the engine.
You get handy in it but it takes a while.
I will check the other 3 another day.

What if they are all good?

oh and btw the cover was sitting a bit loose. the sparkplug don't have a kind of cover but was placed on the screw thread (dont know how its named. i mean the thing were you can turn a bolt on)is this normal?

I mean that thing at the top off the sparkplug:
http://img29.imageshack.us/img29/6004/83305309.th.jpg
http://www.mobikit.nl/atotz/rubriek_2/13/3/get.aspx

if all 4 plugs are the same brownish color, then it means the carbs are delivering the same correct mixture in all 4 cylinders. If one is white, it is running lean, or coolent is entering the cylinder. If it is black, it is running rich, or oil is leaking into the cylinder.

The cover on the top is just an adapter, so your leads fit onto the plug.
Some other leads on other types/bikes you have to unscrew the adaptor, for the leads to fit.

Here....analyze the condiotion of your engine:

http://www.aa1car.com/library/reading_spark_plugs.jpg

http://www.beru.com/english/produkte...gnosehilfe.php

So there is a big chance there is one sparkplug not OK deu uncorrect mixture?
What should it else be?
BTW it also looks not running smooth in idle.