Left handle cap

Unplug computer a fewmin..connection gits dirty. Is batt more then threeyrs..it must read 12.6v always..if not replace or check alternator or chargn wire. Gitit scand ata bikeshop or buya clymer or haynes book

It is a lot of work and there are no short cuts, as I tried what some other people offered????

You will need to remove, passenger seat, rider seat, positive battery cable, side covers, toolbox case cover,
Remove coolant cover case, drain coolant from reservoir, and remove to clean and inspect
Remove clutch cover, loosen all clutch play, then remove cable from lever to allow slack and it to be moved out of the way in the engine area.
Loosen hose to water pump and drain,
rear exhaust pipe and muffler ( saddle bag if applicable), you may have to loosen rear holding bolts for #1 muffler to allow play to disconnect the joint between the 2 mufflers,
Disconnect coolant tube housing (3 - 8mm bolts) in the back of the 2nd cylinder, there is also a 2 bolt angle joint to the coolant
Remove starter motor cover (7 mm wrench), remove the 2 bolts holding in the starter motorin and the lead to the starter motor. Starter motor needs to be played with, jiggle and pryed gently to remove( out the exhaust side) and similarly to install and reverse all other procedures.
To refill radiator undo tank bolt and pull back to reveal radiator cap at the top left side remove cap and add new fluid., other fluid can be added to the reservoir

1. Is it a new bike for you? or do you own it for a while?
2. try checking the clutch. it might need tightning. try from the lever on the top. if you don't know how to, then ask a mechanic.

3. check if you need to "rev it up". when lowering a gear, you let go of the throttle, pull the clutch, give a quick twist of the throttle (pull and let go) while lowering a gear to match the rev's of the engine to the gear, and ease of the clutch off.

4. check you oil level. Some bikes are very sensitive to low oil. My v strom when hitting half, will start acting out with the gear.

first have the fault code read as that save money and time and frustration
then fix the problems found by he code

Lift off the fuel tank and you will see it on the left side.

To access the radiator cap, remove the seats,then the bolt at the rear of the gas tank. You should now be able to slide the entire tank and dash back enough to expose the cap on the left side of the frame. When replacing the tank, be careful not to knock loose the rubber buffers that slide into grooves on either side of the frame.

the only way is to get some locktight or super glue on it to keep it in place for a bit.

Backfiring when the throttle is closed shows a lean mixture. Either you, or your mechanic should take a look at the mixture, and there's a 99% chance that that was the cause of your problem :)