yes, you've noticed it right. Its a lean mixture. Thats perhaps what the service guys would have told as timing change. If the carb setting is right then the pick up, throttle response and idling problems will get resolved. Its very common. Mileage wont be affected that much. Heating will also reduce.

the scooter I got for test ride had loose front brake too. The front lever lacked feel. The showroom guy tightened it when i spotted it. The integrated braking worked well even when the front was loose. After tightening, the independent front brake worked well and integrated braking system was right on point.

No hurry, take your time to get pics and please keep the thread updated on changes you make to the scooter and mileage. Hope you're still getting a mileage above 45 kmpl. That's pretty much what 125 cc scooters report too. So I'm in a confusion whether I should go for this or a 125 cc scooter. I do not know the people who own this scooter personally so I cant comment on their handling and ownership. I would like to believe that the minor problems are because of this difference in ownership and handling and are not present in the scooter inherently.

Tightened the brakes yesterday and now the breaking is great. Didn't fiddle with engine timing etc since for short hauls up to 5-10km of city ride, which is the current use, it's fine.
Also today went to an empty stretch of road to check top speed. I could hit 80 without any problems except I ran out of empty road. The engine was smooth all the way up to 80. The only annoying vibrations are present about 50kmph only. The acceleration was almost linear. Scooter was stable at this high speed.
Here are some pics.

How are you bro? Hope both your hero products doing great. The update on duet ownership experience with regards to reliability, engine smoothness would be welcomed. I'm eagerly waiting for it.

Hello, sorry for the late reply. I am doing good. Hope the same with you. The Duet is nearing 15,000 kms. The engine is smooth. Returns a mileage of 53 kmpl. Checked it multiple times by full-tank to reserve method. There are a few niggles too. The rear tire has 2 big cuts and it has to be inflated once in every 3 days. Thinking to put a tube in it and use it like a normal tube-tire. The seat is not locking. The cable which operates the lock has to be changed. Once, the fuel lid broke. Hero showroom denied to change that it warranty. So bought it from hero spare dealer and replaced it.

Verdict: The scooter is reliable. It does 330 kms on every alternate weekends. Hero service is completely unreliable. Better service it from your mechanic.

Duet has done 16,000 kms. The seat lock cable was replaced. Now the seat locks properly. It was really a hectic job to replace the cable. The whole front portion, floor portion and the seat portion was removed and fit back. It took 1.5 hours to do the job.

Bro, long-term reliability of duet seems to be good. The BS-4 model is even more smoother it seems. Hero seems to have done good job on their first indigenous engine.
Happy mile munching bro. Ride safe & keep us updated about longevity of your duet scooter[emoji4]

Sent from my Redmi Note 4 using xBhp.com mobile app

Thanks man. The scooter is indeed very smooth to ride. It constantly delivers 53 kmpl at present. It has crossed 17,000 kms on the odo too.

Bhai need advice and info is the key on duet is immobilizer one or normal one . As the one on Maestro is immobilizer one.
I am seriously considering duet or maestro just stuck between metal and plastic body thing.
Looking to upgrade from my 9year old activa. And want something reliable and little fun as for more fun i have a bike.

Thanks in Advance.

Our duet (2015 model) has not got the immobilizer. Not aware of the present BS-4 ones.

I can't comment about the Maestro Edge, because I haven't ridden it. But certainly it is bigger than the Duet. Our Duet has clocked more than 18,000 kms and running fine. Only small niggles since it was from the very first batch. Take a test ride of both the machines and decide.

Thanks bhai for the inputs. After getting confused for few days, I have bought new Maestro edge twin shade sporty matt red and grey. On 15 oct 2017. Would be posting the reviews soon.