thanks for the advice bro, you are right i have googled this thing as well and found the ultimate result as we can take a 125 cc to top speed but ulimately wears out engine and its life,
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The main one, and its easy to fix is the chain. If your chain is due for replacement anytime soon, then replace it with the best you can afford. If there is still a good amount of life left, then make sure it is properly adjusted, and well (not over) lubricated.
Next thing to check is the wheel bearings. These should be lubricated, and the wheels should spin freely when the bike is off the ground. These are an often-overlooked part of the bike, but they are important. A quick tip to help your wheel bearings â if you jet wash your bike, donât spray the water directly into the centre of the wheels, as it may penetrate the bearing and cause corrosion.
While youâre on your knees checking the wheels, have a look to make sure the brakes are not binding. This is when the pads and disk are touching slightly, and this will loose you power. It can happen due to a warped brake disk, or sticking pistons, due to the brake calliper being dirty or damaged.
Tyres are another point of potential loss of power, so should be looked at here. The grip your tyres have is very important to getting the power from the engine down. A worn out or square tyre will decrease forward motion, and cost you power. Check your tyres and their pressures, and if they are on the way out replace them. This will benefit all aspects of your riding, not just help get the power down.
So, thatâs pretty much it, but you could have just gained 10% for a couple of hours tinkering with your bikeâŚ. now on to the good bit, the real engine tuning.
The tuning of your engine depends a lot on your budget and what you want. It is better to start small and do things gradually, as you can see what works and what doesnât. It is also important to weigh up the reliability/power ratio. It is no good having a 45bhp missile if your engine needs rebuilding every 500 miles; so keep in mind what the next mod will do to the reliability of your engine. The following starts small and cheap, and gets increasingly larger as it goes on (larger as in more power, but also more cost and possibly more unreliability)
andddddd
"would it go faster if i put a bigger cog on the back wheel"
no, you need a smaller "cog" or sprocket on the back wheel to up the speed, but your still only looking at a 3% gain in top end speed. try a larger sprocket on the front eg. if you have a 15 tooth sprocket change it for a 16 or 17 tooth. this should give you up to about 10 to 15% gain at most.
if you want a bit more then you'll need to look in to rejetting the carb, free flow airfilter, change the cdi for a race or unrestricted cdi, and a free flowing exhaust to help it all on it's way. but remember that even after all these mods your still only looking at a small top end gain, after all it's still a 125cc. if your looking to bring the speed up even more than you need to find a good big bore kit, but thats a lot of work and not one i'd recomened a novice to install.
and modifications can be done in......... porting,
compression, flatslide carburettor, race pipes, lower handlebar, stiffer
front and rear suspension, close ratio gearbox, racing magneto and CDI,
wider rims, better tyres
kindly go through all this and if you can find some thing beneficial TECHNICALLY do let me know and i have 1 more question that why the classic 125 have more pick than this piaggio???