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First and foremost check the oil level in the oil tank.It might be due to lack of oil.

Get the carb and your exhaust cleaned for better mileage and performance.

Hi, A bit of basic knowhow would help you a lot. 7k on the bike should really make the engine almost new but since you dont know what the mech has done, better forget the amount spent.
Now, you have to find a reliable mech there and im sure some Chennai guys here like Sriramefunds would be able to help you out on that. Things to be checked and changed on the bike are, piston-ring condition/ compression, any airleaks, head and exhaust gasket, silencer to header pipe joint, the mech cud have changed the silencer muffler tube, carb jets, new original airfiler, new oils, new plug. [ All the above items incl. new piston and boring should not cost you more than 5k] but let the mech and your fellow xbhpian decide.

if she doesn't sputter, makes less power, has the same exhaust pipe, returns shitty mileage and goes like tak tak tak when you idle her well my friend she's lost all the compression

Thanks for the response! Thanks Noor for approving the thread.

I been reading a lot about two stock engine and it's working. Now I kind of know how stuff works. Before my cousin used to take care of maintenance so I never need to know about it. After relocated to Chennai I'm kinda lost.

@yamdoot
I now sure about Air leak but there is oil leak for sure because i see oil stain where i keep my bike. Last time when I took the bike to a mechanic he said he cleaned the silencer .. After that I think my mileage went down and a crappy sound. I'm not getting that genuine Yamaha beat. I'll check the rest.

@The Great
I used to pour oil with petrol.. that what i was told to do. I have to find a good mechanic this time to get things done, Is it something I can do like cleaning and exhaust and crab if so where is the crab? sorry i'm just in learning curve I don't want to use any other bike or get a new one, I can't give up on my RX because I learned how to ride on RX since then I always had RX .

@dafc
Yeah I think your rite

For anyone from Chennai: I heard some Shankar near Chepuk is good with RX? I heard he is also drag racer

Well it's time for next overbore or sleeve then!

Oh .. Thanks
Do you know how much does it cost approx. ?

I paid 150 bucks for overbore 225 for the piston and labour charges were extra, had to chamfer the ports myself it is very important to make sure the ports are chamfered otherwise rings give away in the first 1000kms. But before jumping the gun take her to a mechanic and get a compression test done if it is less than let's say 140ish PSI you could try re-ringing it see if that helps and make it double sure the ports have been chamfered. If it is even less than that and there's piston slap or rattle you'll have to overbore or sleeve it up if you can't overbore it anymore.

@Shyam - You have a PM. Also let us know what exactly was done by the mechanic to charge you 7k on your bike!

The carb is right behind your engine which connects the air filter. Its a small device but its not advisable to do it yourself. Rather what i used to do is, always eat the mechanics head about where is what in the bike. I know people love to do a lot of things by themselves but i prefer the mechanic to handle such jobs. So my advice would be that you find a good reliable mechanic rather than handling things yourself.

225 for which piston? What do u use to chamfer? I think 140 Psi is an optimum comp. maybe less than 120 can ask for a ring change.

Yo it is a fedral mogul goetze piston, the manufacturing plant is here in Patiala itself and I got it from the company depot. Less than 120 yep would warrant for a ring change only if there isn't much rattle or slap (that signals lateral movement) because in that case it is wiser to overbore or resleeve. I used a needle file (one side flat and other round) to chamfer the ports and I did it at a 40ish degree angle and made it extra sure that the ports were butter smooth, so far so good she is holding on to it been almost 3000kms since this was done.

EDIT: yes 140 is good enough but fresh rebore with good ring seal will give you 150PSI

@SriramEfunds
He said he change the battery, Front tier, did wiring(that's a joke there is no dim and bright just one static light), he said he changed the engine oil, full water service. Then he said he did something I can't remember it was a year back. But I know for sure he was cheating.

@The Great
Okie I'll take her to mechanic

@Shyam. there is nothing like working on your own bike.. gives you both knowledge and satisfaction! Ofc. you have to take the bike to a mech for jobs you cant do at home or your not in a mood to dirty your hands. Even if you get the job done at a mech. be sure of what hes doing coz remember what happened when you took the bike to the mech last time?