why is it so hard to believe that you are getting good mileage argee

The correct way to know the FE is to have a 500ml bottle filled correctly with 100 or 200 ml of petrol and use it to drive and find the actual mileage.Reserve to reserve or tank full to tank full have certain chance of ambiguity creeping in,due to variables..

Guys, Thanks a lot for the helping hand, but let me tell again - CIRCUMSTANCES or its becoming highly impractical for me to check reserve to reserve. See, like, today, I'd to make a 100+ Kms via Chennai bye-pass & not sure how much would the 850 ml last. So if I get struck in the bye-pass after Ambattur, the next fuel station is HP which is about 23 odd Kms away. Also I do not know the quality of the fuel available. So it is better to trust the known devil near my home than the 23+ Kms away fuel station. Like wise, I stock up 3-3.5 Lts every week inorder to avoid visiting fuel station twice a week.

I know, but...

The pre-mix is also one of the troublesome way. But somehow I was determined to find this time & was forced to visit the fuel station twice this week.

This is Rx & I personally ride in speeds excessive of 70 Kmph EVERYDAY & after filling for 2 lts y'day, I ripped in 110 to catch another Bhpian in Getz . So no way I can get even 35, forget along 40+

I think this is going to be the best way for me under this kind of circumstances. Actually you're right, I could've simply hit reserve today, filled for 500ml, rode for a distance & measured the FE

but bro the 5speed stock carb is the VM22 4TL4 20.....then in which carb did u run before this??

If you could brief the ambiguity when we measure reserve to reserve would help me understand.

You said that by using 100ml or 200ml of petrol shall find the mileage. However, my point is from when? Empty tank? Reserve? As I said earlier, by just one time exercise might not give the true picture. If I were to find out from my RX, would try to doing the exercise more than once to know the variability.

Tank to Tank, Reserve to Reserve and running on 100ml/200ml are the methods used to find. In my opinion, reserve to reserve way is slightly has an edge over other methods. Reason? Least you don't have to worry if we run of Main, reserve would help carrying on.

Filling 100ml/200ml of petrol and running would also yield result, no doubt, the cumbersome is that when it is over, you will need to do some math and fill fuel again(if tested on empty tank).

Just my thoughts!

^^^ Nice questions Sri, I'd like to get clarified too. I initially thought, 100 ml or 200 ml once the vehicle hits reserve. But its better to get it clarified from PSR ji rather than assuming something incorrect

First you must have the measured amount of petrol in the testing canister(bottle). Now close the petrol tap,and pull out the petrol tube from the tap. ....run the bike till it stops.... note down the Odo reading...now connect the test canister, and run the bike ..either like the testing guys do..steady at 40 to 50 Kmph on a plain road,without much traffic and gradients....run the bike till it stops and note the Odo reading...you have the FE of your bike, at the conditions you had tested.Alternately you can drive your own usual way and get the readings to know what your kind of driving is...Fuel efficient or not,and change the way you drive for optimizing the FE.
When we try to test the FE reserve to reserve, the following variables will affect our reading:
1. The filing station has to be the same Always.
2. The quantity of petrol dispensed is different for different temperature.ie., cooler climate=dense petrol, more FE...hotter climate = less petrol filled ,...less mileage.
3. Possibility of air also being in the filler tube,reducing the quantum of petrol filled.We have no means on knowing if 1 liter filled at the pump is 1 liter or 900ml....further....next point..
4. Debris which comes along with petrol from the filling station sometimes blocks free flow of petrol through the filter in the tap and may give false reserve...moreover if the bike had been standing on the side stand some amount of petrol from the right half of the tank can flow into the left side to give an enhanced FE.
5. Our driving for shorter distances is more likely to be consistent than the long drives ...hence a more consistent result is possible for evaluating FE with short distance drive...however for knowing FE under ALL conditions a canister with 1000ml(1 Lit) will give a more realistic FE result.

grrrr!!!!! my stock cdi unit has blown off!! that's why i got a stuttering problem!! i thought it was due to carb!! :X now a new OEM cdi costs 750rs...can we repair the old cdi unit?? (though i have fixed a new one) jus due to curiosity??

Not sure or heard anyone fixing a damaged/broken/blown CDI unit. Let's keep that mellow as it is uncommon to have CDI blown often.

well my bike was running in that blown cdi for past week !! around 300km !! the problem it gave was misfiring !!! so only i thought there may be a chance of repairing it !! anyway thanks for clearing my doubt bro!!

@Dpak - I'd agree to Sriram that even I haven't heard someone fixing the CDI. May be PSR ji could give a try, but how do you break open an epoxy sealed unit ?

Rebuilding may not be worth it..Here is the stock RX CDI circuit..you can build it if you want and keep it as spare...will cost you less than 300/-

wow!! thank you sir!! will try to build it !!!

Where can i get the cdi unit of DT125 ? im ready to buy

guys!! Help me!! i am having a prob in Carb(i think )....i just nw changed CDI unit and silencer core(in YSS)...and then i cleaned carb myself!!yesterday my bike suddenly stopped when it was running!! i then tried everything like cleaning plug and fixing it again!!etc...only after removing carb and reinstalling the jets it started again!!P.S:it took 3 hours to start it again!! then i found that the spark plug was not working ...so i fixed a new one!! now it is starting but still when i engage clutch or when i release the throttle it goes off!! but in neutral its fine, idling is good!! is this coz of jets setting?? only 3 days for ISG2G !! pls help !!