Kits like cobra or sigmajet are great for tweaking, judge your present performance first and determine if you're in the ballpark; Is it responsive throughout the powerband? How's your exhaust looking? If the pipes are showing signs of getting too hot (chrome bluing, exhaust tips chalky white=too lean, tips black=rich).
On to the spark plugs. "Reading" a plug gives an excellent picture; after a somewhat aggressive run with out too much idling pull the plug and have a look at the porclean insulator just above the electrode gap. Best is a nice even cocoa brown. Black=rich, white=lean. I would suggest zeroing in thoroughly, then consider going above and beyond if you wish.
If it's a 2 stroke you have a crank seal out. It can have compression but won't have vacuum, and it won't run. Sometimes the seal can be replaced on the magneto side without splitting the cases, but I'd rebuild the entire motor and replace the crank bearings along with the seals. Good luck!
The bike doesn't exist as written.
https://www.google.com/search?q=410JS+1000cc+santana
We are better with 'year make model 1000cc'.
Better to not try and do better than the bike engineers. A mechanical pump runs when the engine is turning, an electric pump will run as soon as the key is turned and create pressure all the time. It would have to be an in tank electric pump or it will burn out. Electric pumps are cooled an lubricated by the fuel passing through it. If it is a carbureted engine, you are pressurizing the carb bowl. If injected, it may already have a fuel return.
Check the mechanical pump for a torn diaphragm, they are easy to change.
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Question edited for clarity and add maker.
Try cleaning the Throttle Body. This bike works the same as a car. My first thought was that it has a diaphragm carburetor and the membrane was punctured or split. This bike is not sold in North America
https://www.google.com/search?q=yamaha+yzf+r15+v3+clean+throttle+body
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Question translated for clarity and into written English. :>D
Test the coil, test the CDI or Contact Breaker Points if it has them.
All questions need 'year make model', or at very least 'make and model' please.
Help in the link
https://www.google.com/search?q=Pit+Bike+with+no+spark
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