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The Diamondback Joker bmx bike is currently one of the highest rated bikes on the site. It is said to offer an excellent blend of performance and pricing.
You can get a great deal on a Diamondback boys bike from your local bike store. Failing that you can try the online Diamondback store, Amazon or eBay.
Diamondback bikes come in many sizes and styles and can start as low as $130 for a little kids bike on up to almost $5K for a top of the line mountain bike.
A bore kit does not make a bike faster. It makes the engine more powerful if you want to go faster you must work on gear ratios and or sprocket sizes.
jcs or any bike store
The chainring by the pedals and the sprocket(s) by the rear wheel.
the joker.
25t means that there is 25 of the little spikey teeth on the outside of the sprocket :]
Chain is on the smallest sprocket on the crank and on the largest sprocket on the rear wheel
Don't know what you mean by a bike being "pro".
Not a sprocket only, but you can buy a 23-tooth freewheel that should fit.
Depends. Usually there's some leeway for adaptation, but it's possible that your bike was delivered with the smallest sprocket available for that hub.