Pictures carburetor WHERE DO ALL THE PIPES CONNECT

Vibration and shudder in a newly rebuilt engine can be caused by improper assembly, mass imbalance, camshaft misalignment, improperly adjusted exhaust pipes, or improperly adjusted carburetors or injectors. It is recommended that the engine be inspected by a professional mechanic to determine the exact cause of the problem and to correct it.
The causes are:
Improper mounting: If the engine mounting bolts are not tightened properly or are damaged, it can cause vibration. Similarly, an improperly installed motor mount can also cause vibration.
Ground imbalance: If the motor parts are not balanced properly, it can cause vibration when the motor is running.
Camshaft misalignment: Incorrect alignment of the camshaft can cause vibration when the valves and pistons collide.
Improperly adjusted exhaust pipes: Improperly installed exhaust pipes can touch other engine components and cause vibration.
Improperly adjusted carburetors or injectors: If the carburetors or injectors are not adjusted properly, it can cause vibration in the engine.

Question moved from Computers to Motorcycles (guess).
Question edited to fix typos. HOWEVER

ALL questions need 'make model (what it is)', and you give no clue except it is something with a carburetor.

Google

year make model refit carbs

and look for videos

https://www.google.com/search?q=1992+honda+CB400+refit+carbs

..

it's on the back of the intake manifold just above the crossover pipes it looks like a flying saucer with a vacuum hose at the 3:00 o'clock position right behind the carburetor and has 2 bolts at 3:00/9:00 o'clock go to rock auto.com and look up your truck and in exhaust and emissions is where you can see a picture of it

INFO ?

THis provide that it still the Briggs 331877 on it
Install Carburetor
NOTE: Always replace air cleaner gaskets and carburetor mounting gaskets any time the carburetor has been removed for service.
1. Position new gasket on studs with long edge of gasket opposite fuel inlet of carburetor.
2. Hook governor spring in throttle lever hole without grommet. Hook governor link in throttle lever hole with grommet.
3. Hook choke link into outer hole of choke shaft from underneath. Slide other end of choke link into slot in governor control bracket.
4. Position carburetor on engine. Install Carburetor to intake screws or nuts and torque to 70 in- lbs
5. Connect fuel hose to carburetor and secure with hose clamp.
6. Using new gasket, install air cleaner assembly to carburetor.
Adjust carburetor, if applicable.
7. After final carburetor adjustment, use Knockout Pin #19135 to install new limiter cap with flat side facing up.

Car model and type?

That's why sensible people put exhaust pipe shields over their pipes. Buy some soon or burn yourself!

It may indicate that but that doesn't mean there's anything wrong with it. If the bike sat for a long time while running, the exhaust can get hot enough to discolor the pipes...but that doesn't mean there's anything wrong with the motor. Improper carburetor settings can make the bike run lean (not enough fuel) which, in turn, can cause a hotter than normal exhaust and discolor the pipes...again, this does not indicate there is anything wrong with the motor. Ask if the pipes are stock or after-market. After-market pipes are a minefield for motorcycle riders. When the manufacturer puts the stock pipes on, they are tuned to the motor to give peak performance which usually results in little to no bluing of the pipes. Aftermarkets can throw the tune off and discoloration is the result. Ask the seller if there have been any changes to the bike...such as after-market pipes, rejetting the carburetor, changing the intake, etc. Most likely the seller will say yes, there have been some changes made. Please note: THIS DOES NOT MEAN THE BIKE IS BAD OR THE ENGINE IS WRONG.

As I know there is a vacume pipe from engine to carburetor, this vacume pipe is installed on top of engine cover to under carburetor (between carburetor and the inteke manifold).