FOund some time to reply to your query.

Ok coming to basics of carburettor tuning, then for tuning the carburettor you first should ensure the following thing.

1. The carburettor jets should be clean. If they are blocked then you will not be able to tune carb no matter what.

2. Air filter should be clean. Today manufacturers are giving viscous air filter which gets dirty easily and can't be cleaned. So ensure air filter is clean.

3. Spark plug is correct and not sorted. It must be giving strong and hard spark.

OK now coming to actual tuning.

1. Engine should be sufficiently warm and idling smoothly. Ride for 5-6 kms and get the engine warm.

2. Shut the engine. Now tighten the air screw slowly till it seats lightly on the end. Now back out and open 1.5 turns by counting .

3. Now start the bike. Increase idle by idle screw. Increase to 2.5k rpm or more just by hearing. No hard and fast rule.

4. Now slightly open the air screw, slowly 1/16 th of a turn at a time. You will see the idling increase.

5. At a point bike idle will be highest. From that if you move the air screw any direction, the idle will decrease. This is the perfect position.

6. Now decrease the idle to 1100 rpm just by feel. Bike strokes should be smooth and idle speed will be slow. That is the best idling speed.


And last but not least if any problem, get everything ready and call me. I will guide you by hearing the sound.

Thanks for the reply
well i have tried tuning with this method i do get better performance mileage hasn't improved but i have one problem my spark plug is always covered in soot no matter how much i open or close the air screw i have tried different spark plug but when i remove them after a ride all are covered in black powdery soot i don't know whats the problem
i had gone to a mech for for setting my rpm through tachometer he did the setting and also adjusted valve clearance he told me my valves are defective and damaged and i should change them and quoted the price of valves 1500 that was the first and last time i had gone to him
do you think the valves are at fault here for the black soot
i will try the 200 ml pipe method posted by @2wtourer for improving my mileage that was a pretty neat method indeed

Post a picture of spark plug. Then i will be able to tell you what is the problem.

Guys....a bad news from regarding Twister. Honda is stopping sale of Twister due to low demand and it will be launching a new model that will replace Twister. Check link below for more details.

IDK about genuineness or anything but u can get a sppedo cable at almost any local motorcycle spares shop, even a typical Splendor cable should work fine, but icase u are looking for genuine one HONDA spares shop that sells genuine is ryt near Express Avenue on Bharathi Salai,<opp to signal> {dont remember the shop name} , costs around 80-90 bucks, but yeah at local store u can get for even 50.>.,, its just a speedo cable in terms its GENERIC for most vehicles , unless digital speedo ..

Honda CB Twister



A sporty bike for youngsters which will go easy on your pocket!


Engine


Type 4 stroke, Air cooled, SI Engine
Displacement 109 cc
Power 9 bhp @ 8000 rpm
Torque 9nm @ 6000 rpm
Air Filter Paper filter viscous
Starting Kick/ Electric

Changed Rear tyre, while odo reads 27.5K, to Zapper YM 80x100-17 TL costed me 1200 inr. Front still have bit juice left and inquired it would cost 1150 for Zapper FS

[ATTACH]195801[/ATTACH]
Picture for ref : MRF Zapper YM

1200 rupees??
From where......?

Finally i got engine problem.... hearing clattering sound. Without checking they claimed piston problem blah blah blah....quoted 5000 rs advance 18000 rs. Phew..... what do i do now. Bike is 5yrs old...... ran 24000 kms.