Hello!
As I now run a mikuni vm38 in my savage, i decided to disassemble my bs 40 to learn something form it and maybe make it run better, as it was very bad, not getting over 90km/h even when the throttle wide open.

I opened up and the first thing i noticed is how hard it was to remove the slide, it was somehow stucked by dirt:



I cleaned it up with some kerosene and now it slides smoothly inside. But is all this wear and scratches normal? should I brush it with something like steel wool to make it better?

Also is this gap between the throttle plate and the carb's "walls" normal?

90 km/hr is terrible (as you know). You should be able to hit 140 without a problem! I would do a general service ... air filter, oil filter, check the jets and fuel line etc. If all good there, I would check the exhaust port for carbonation (are you running a stock muffler or open pipe?) If still good, then maybe a compression test.

Oh, and the stock fuel tap can produce some weird symptoms.

Forget what I said ... and listen to Mike!

I didn't appreciate (at first glance) what condition your carb was in.

I appreciate all the thoughts!!
Indeed, as I have no experience with carbs I decided to inspect it and understand it better. It runs, poorly, but it runs, but yeah the vm38 right now is the one I'm using

I can't say for sure the mileage on it, because i bought it used, it's a '95 savage in 2020 and the speedo tells me it ran only 30k kilometers. I reaaally doubt that.

Also there are other issues in the carb that i didn't show, such as throttle cable assembly was somehow swaped.

I can post the others photos of the carb if you guys are interested to see

Sure Fabricio, post the pics.  There's always something new to learn.  As I previously mentioned, the corrosion on your BS40 is extensive.  Never seen anything like it.  Let's see all the gory details.  What's it look like inside?

Wow!  Thanks Fabricio.  What an education.  I don't think I have ever seen one corroded quite this bad.  It actually ran like that?

I can't get over the corroded throttle shaft.  Do you have any idea where this thing was stored?  Was it simply left out in the weather?  How many years?

One thing I find really interesting is it's corroded, but it's not gummed up.  You can see the base metal.  Its badly pitted but it doesn't have a quarter-inch layer of gummy residue like typically seen in a carb that has been sitting for an extended period.

Is there any way you can share some history on this thing?  Maybe the prior owner could fill you in.  I believe you are in Brazil, do I have that correct.  Do you folks in Brazil have straight gasoline or do your service stations dispense gasohol (ethanol & gasoline blend)?

Looks like it was in the ocean!