Ok, so starting with the larger performance mini moto parts. The largest part you could get for your mini moto is probably a big bore kit. This will increase the displacement of your mini moto and give you great power gains throughout the rev range. It is becoming cheaper and cheaper to buy these kits for your mini moto and they certainly give the greatest power gains for the money so these kits are highly recommended. However some mechanical knowledge may be required in order to fit one of these kits, it is basically putting a new engine in!
Once you’ve got a big bore kit for your mini moto, you can start with some of the smaller mods in order to get the most out of your mini moto engine. I would now purchase a performance mini moto exhaust. These are great and if you get a good one you will see noticeable power increases, especially mid range and top end on your mini moto. In some cases these exhausts alone can add up to 10mph to your mini motos top speed and increase acceleration dramatically. Exhausts can be purchased for under £50 in many places on line, but if you are looking for a top quality exhaust system which is going to benefit you the most then it may be worth looking into some slightly more expensive exhaust systems.
I would now go on to modify the carburettor and air intake on your mini moto, I find these very restrictive on most mini motos and if this area of the mini moto is modified correctly you wont be able to believe the power gains and feel of your mini moto. Get yourself an upgraded performance carburettor. Performance big bore carburettors (usually around 57mm) will let your engine breathe and really let it perform how it wants to. If you combine this with a performance air filter, upgraded jets and tune it all up correctly the performance increases will be amazing. Your mini moto will feel like a new bike which will rev freely and be a lot quicker than the standard bike.
Now you have added the larger performance mini moto parts it is time to fine tune your mini moto and get the last dribbles of performance out of your engine.
After adding the above modification I would definitely now go on to improve the ignition system, firstly by replacing the spark plug with a high performance spark plug. I would recommend NGK spark plugs, and also by changing the changing the spark plug cap to an NGK one. This will help to stop your mini moto ignition system begin burnt out by the extra power increases. It would also be a good idea to change the lead and coil in order to cope with the power gains.
Also it may be an idea to get an uprated chain, one which will be able to cope with the power increases you have put the bike through. The reason I say this is because I have experience of the weaker chains found on most Chinese mini motos snapping on numerous occasions as they are just not tough enough to cope.
There are many performance mini moto parts which can be added to do with the clutch and gearing of the mini moto, this will ensure that power is always delivered efficiently when you need it. Try adding a rocket key to your mini moto, this is a very cheap modification but will make the bikes timing noticeably better, improving the speed at which the bike pulls away and its acceleration through the low range.
One problem with Chinese mini motos especially is the clutches on these bikes are not up to hard use. You will find clutches burning out very often and power gains being significantly less as the clutch can not cope. This is why I would highly recommend buying a heavy duty performance clutch. You will find the power is delivered faster and smoother than with a standard clutch and you will not need to replace it half as many times.
If you are racing your mini moto, or want to get better acceleration rather than top end or vice versa then you need to change the gearing of the mini moto. This is done by changing to different sized sprockets on the back and front. A larger sprocket on the back or front will decrease acceleration but increase top speed, whereas a smaller sprocket on the back or the front will increase acceleration but you will suffer top end. Depending on how you want the mini moto to ride will affect the sprockets which are used on the bike.
Now you have made these changes to your mini moto you will feel an enormous increase in power, speed and pleasure of riding. Remember though to always ride on private land and to wear safety equipment.