You can bore out the barrel to take a bigger piston or swap barrels from a 110 or 125. I know the 110 barrel can be taken out to take a Kawasaki 150 piston. This will need a new CDI and best to modify the exhaust too (more free flowing). I've done this with my Honda C70 and gone up to a wave 125 piston. the only thing holding me back is the 3 speed gear box but I have changed the sprockets to give higher cruising speeds.
You will need a bigger carb. Honda Dash Carb is just spot on. Its a Keihin and get an original (with the heavy plunger) not a cheap fake. They can stick open causing problems!
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Hi, Maurice that is the average top speed of a 250cc 4 stroke engine but depending on how fat your wallet is there are a few things you can do to increase speed:
1. Adjust throttle cable so carburetor slide is completely up.
2. Experiment with larger carburetor main jets.
3. Go up 1 tooth on your front sprocket or down 2-3 on the rear.
4. Adapt/fabricate a K&N high flow air filter kit.
5. Performance camshaft if available.
6. Performance exhaust system.
7. Big bore cylinder kit.
I know this is a brand X scooter but if you spend enough time on the web and know where to look by googling and visiting dirt bike forums you may not get what you want but you can always get what you need. Good luck and have a nice day.
The speed of the scooter will vary depending on the weight of the rider and the terrain. If you are close to the maximum weight or going up hills, it can slow you down. In some instances, the controller is installed with the speed control set at less than 100%. The scooter technician can adjust the speed, but I do not know of a device available to the general public that will allow you to reprogram the controller. You may want to contact your Tech Support to see if they can ensure that your controller is indeed at 100%. Larger wheels may cause the batteries to drain faster and cause straining on the motors which will not help with increasing your speed. Customer modifications to scooters may void the manufacturer's warranty, which may cause you to have to pay for future repairs out of pocket. If your scooter is new, trying cycling the batteries a few times to ensure that you are getting a deep full charge. Ride the scooter until the batteries go into the red before putting it onto the charge. This will break up any solids that may have formed inside the batteries before it was delivered to you. I hope this information is helpful - good luck!
1 - There are many possible variables here, such as added accessories, load, road, wind, etc., but the strictly stock bike will probably be the least stressed at 45 to 55 mph in 5th gear, although this engine is so understressed by design, that riding as fast as it will go is not likely to cause any damage.
2 - The ACE 750 has a loyal following of fans, and you can find them on the web by googling "honda 750 ace"; they know what works and what doesn't, and are more than willing to help.
"chipped the engine"... If you have done modifications and now your engine is not running properly, remove the modifications and see if they go away. It could be any of the things you mention, but it is most likely related to the chip installation.