Thanks for all the info guys. Appreciated.

Kris01:

It was the right bolt & my drain pan got filled with about 1,5l
of old oil. About the brass plug on the idle mix screw, it's still there.

I performed the draining with the bike sitting on the stand though,
maybe I should have tried to lean it in the other direction at some
point.

Dave:

Will try with fresh fuel. Wouldn't have imagined fresh fuel
to make a lot of difference after two months so thanks for the
hint. About the old plug, yeah, I took it out after changing oil/filter
and noticing the bike stalling under the described conditions. This
was also after the 2 months of storage, before that I think I drove
the bike for about 1k km. The deposits in the sparkplug itself though
look quite stiff and solid, like if they were old enough to think the rich
condition has been there for a while. But my ignorance should be
factored on all these conclusions

Few questions for everyone:

Whats TEV and E10?

What kind of external tachometer would I need to adjust the idle
speed if I wanted to be 100% accurate? Are there any other
formulas to perform this without a proper tool in addition to the
10mph idle speed at first gear that serowbot mentioned?

Still thinking about the old filter, has anyone experienced similar
problems with a bad filter? What are the symptoms you'd expect
to see/ear if the filter was the one at fault? Is there any way to test
the filter for correct operation?

Is there any easy way to perform a light cleanup work on the carb
without disassembling it fully?

Thanks again for all your help guys.

Can you do me a favour and turn your petcock to Prime and try again with it no longer running with the vacuum?

Thanks again for the info guys.

Dave: I'm using 95 octane gas, I have no information on the amount
of ethanol that is present on the Chilean mix but will try to figure out.

Surprise surprise. I took the bike out for a short ride around town. It
performed quite normally, no stalls and predictable acceleration as
far as I can tell (Not a lot of experience with the bike nor bikes in
general). After the ride I went for lunch and after finishing I tried
the prime test suggested by greenmonster - the bike didn't stall.

Additionally, I tried doing the same with the petcock in its normal
"on" position and it didn't stall neither.

So, I'm quite puzzled, I guess it deals with the motor being warmed
up already but I keep thinking that it shouldn't stall no matter what
(cold or warm), and this is what I remember from before the bike
was stored, It never stalled.

Anyway, I recorded a short video here so you can take a look and
help me figure out if the small "about to stall" moment shows signs
of the idle speed being too low (video recorded with petcock in the
"on" position, I also performed the test on prime with no noticeable
differences):

https://youtu.be/CpJ7DIA-5AE

I'm happy though. At least I'm almost sure now that if the bike
is warm it wont stall

Now on the possible too rich condition, I took a picture of the
first section of the exhaust as it's quite blueish - brown. Considering
this bike has 2700 Km on it (almost new), do you think this decoloration
is normal? might it support the idea of the motor running too rich?

Thanks again for all your help guys! You rock!

Hi Dave. Thanks for taking a look at the video

So I will proceed at riding the bike with new fuel and see how it
behaves. Regarding the possible too rich condition, would you consider
the blue/brownish tint/decoloration on the exhaust pipe (picture
attached in the previous post) as an indicator that might confirm
this? As I said before the bike has barely 2.7Km on it (around 1.7K
with the previous owner).

I haven't abused the bike and I have drove it pretty much always
around 60-70mph max. While I'm new to bikes I have been driving
a stick for more than 2 decades so I would like to think I have
a proper sense for gear/rev/speed shifting. I usually stop every
2 hours or so on long drives too.

If the pipe is getting too hot I don't think I'm the one at fault. But
then I'm not sure whether that decoloration after a few thousand
km is to be expected. Can you guys confirm?

Thanks a lot

Revving it up sitting still will blue the pipe.

Adjust:

https://www.youtube.com/watch?v=YxpQjDQzX7g

reynaldo wrote on 04/17/15 at 09:45:48:


Ignore your spark plug color.....the idle mixture has almost nothing to do with the color of the spark plug.  The rpm at idle won't ever keep a spark plug hot enough to read a proper color.

Idle mixtures are set by "ear"....not by "eye".

Thanks again for all the info guys. I will adjust the idle speed knob and let you know how it goes.

Cheers,