I hauled one wheel and new tire, put it back on, hauled the other.
Paying for them to R and R the wheels?
Wow,

Kruzader wrote on 05/09/16 at 12:25:21:


Brakes?

The rear brake often needs a lot of dust/rust and crap cleaned out of it.  Don't forget to move the operating shaft in the backing plate and confirm it rotates easily...might be a good time to take it apart, clean the parts, and grease the shaft before putting it back together.  (Then pop a cold one and take a break!).

Nobody looks your bike over like you. They are getting paid to do tires. If you make a point to ask them to give it a going over, then be prepared to pay for an inspection. I always use a shop that allows me to be there, watch, ask questions. That was important for me. I am and always have been a mechanic, but the bike was intimidating. Needlessly, as it turns out. But Seeing someone do the valves helped me find the confidence.
You might just be ahead to ride in, watch and see what they have to do to get the wheels off and back on. Pay attention to the spacers on the rear axle. Just because you're paying for a professional mechanic to do it right doesn't mean he Knows this bike. We've seen engines destroyed by professionals just doing an oil change.
Trust, but verify..

I went out on my first ride today, left early to avoid traffic and everything was going great, new tires felt amazing.

Sadly and scary, my biked stalled as I downshifted and i was about 50 miles away from home.  (I was coming to a stop and down shiftin from 5-  4 or 4 - 3 dont remember)

On the way back, the bike's engine stalled again going from  1- 2 or 2-3.

Kinda, sad that this is happened. Since it was my first long trip.

I think the it might have to do with  the the fuel system. Maybe the famous petcock, also the previous owner rejetted the carb and changed the air filer.

There's a 75 mile run in town next Saturday that I'll like to do, but afraid I might encounter this again.  

Any advice where to begin?

I'm attending the bike little by little, my next schedule things are air filer, and sparkplug.

So far, new tires, oil change, and I just broke into 17K on the speedometer.

Maybe I missed your mileage..
The plugs in the car might be OEM.. Plugs hardly ever go bad.
Before you go there, clean up around the base, junk collects there. Antisieze is good putting stuff back together.

Idle speed first.

Kruzader,

Sometimes the idle dipping when shifting comes from a dirty Transient Enrichment Valve.

The Transient Enrichment Valve is one of the easier parts on the carburetor to clean, but you have to be very careful with the rubber diaphragm and only use warm soapy water to clean it. You will notice some small holes visible and they must be clean, the little air bombs for cleaning computers work on the tiny passages.

Before you take it off you should probably get stainless steel Allen screws to use when carefully reinstalling the spring loaded cover.

There is plenty of information on doing this in the Technical Documents.

Kenny G

Guys, thank you. Ken... I went ahead and bought the screws from David some time back, figured one day I would need them.

I really want to attend the carb adjustment, but I been hearing this new sound on the engine, by the Generator Rotor.

Quck history, I did an oil changed (following recommendations here) and the bike was running fine. I got new tires installed and all these new issues began to appeared.

Before the tire change the piston head sounded louder and muffler had a bit rougher sound - the bike felt with more power. I got the same tire size, but i think the new model is a little larger, but this shouldnt afffect how the inside of the gears are sounding, right?

Now i feel like i have less power, the piston sounds like it puffes air, theres this pff pff sound and when idle or lowering to the bottom gears I get this sound as if i had  bunch of little pebbles on a tin can and spinned it.

Check out the video, at 1:08  and 1:38 you clearly hear it.

I'm afraid im going to destroy something in the engine if i continue to ride it like this. ... and this weekend i'm schedule for a  100 mile poker run.

VIDEO:https://www.youtube.com/watch?v=bpuHmEMSuFY&feature=youtu.be