thanks. very informative . i will try this. currently i am on 3.5 turns but will check milege from 2 turns. but accidentally and very idiotically while lubricating the chain yesterday my right hand middle fingure (:P) got crushed in the chain sprocket and had 4 stitches currently. so i am unable to drive for next 15-20 days. when i get well i will share the results. <img src="http://www.xbhp.com/talkies/images/smilies/frown.png" border="0" alt="" title="Frown" smilieid="11" class="inlineimg">

Hi man , I don't know about your spark plugs issues, and I'm not mechanically sound. But I can give solution for your mileage. If you are getting right mileage and satisfied then don't worry about these steps.

Now take your bike for a ride about 5 km. And you must reach a road where there is no traffic or go by early morning. Take a small size screw driver.

Now your engine must be warm. And your idle rpm must be 1000rpm. If not adjust your idle screw according.

As per technical manual for discover/pulsar the number of turns for mileage screw is 2 - 3.5 turns from the tight / locked position. I meant 360 degree rotation for 1 round. And your best mileage should be between 2 to 3.5 full turns.

It will be headache for us to check 1litre for every 0.25 turns. so you must start checking your right mileage starting from 2.0 turns and check by turning 0.25 turns out upto 3.5 full turns.

you can take a piece of paper and draw your rotations [ATTACH=CONFIG]81149[/ATTACH]and mark record your mileage for every turn. See my picture how do I did and recorded.

Now will say how to check your mileage very soon.

1st - turn your mileage screw to full tight position
2nd - turn to 2 full turns out and switch on the engine and check the rpm and adjust your rpm now to 1000rpm
3rd - switch off your fuel flow from tank
4th - your carburetor should have fuel in it. I hope this amount of fuel should give about 1.5km to get at least 55km.

once your bike got off record your km in the paper in a separate column.
Now open your fuel and adjust your screw from 2.0 to 2.25 position and off your fuel flow.

I hope like this we can easily tune the carburetor for better mileage. Pls test it out give your feedback. Im sure its waste to trust these ASC guys. I think no one know about exact tuning. Only when the factory settings would be the correct one.

Hi man , I don't know about your spark plugs issues, and I'm not mechanically sound. But I can give solution for your mileage. If you are getting right mileage and satisfied then don't worry about these steps.

Now take your bike for a ride about 5 km. And you must reach a road where there is no traffic or go by early morning. Take a small size screw driver.

Now your engine must be warm. And your idle rpm must be 1000rpm. If not adjust your idle screw according.

As per technical manual for discover/pulsar the number of turns for mileage screw is 2 - 3.5 turns from the tight / locked position. I meant 360 degree rotation for 1 round. And your best mileage should be between 2 to 3.5 full turns.

It will be headache for us to check 1litre for every 0.25 turns. so you must start checking your right mileage starting from 2.0 turns and check by turning 0.25 turns out upto 3.5 full turns.

you can take a piece of paper and draw your rotations [ATTACH=CONFIG]81149[/ATTACH]and mark record your mileage for every turn. See my picture how do I did and recorded.

Now will say how to check your mileage very soon.

1st - turn your mileage screw to full tight position
2nd - turn to 2 full turns out and switch on the engine and check the rpm and adjust your rpm now to 1000rpm
3rd - switch off your fuel flow from tank
4th - your carburetor should have fuel in it. I hope this amount of fuel should give about 1.5km to get at least 55km.

once your bike got off record your km in the paper in a separate column.
Now open your fuel and adjust your screw from 2.0 to 2.25 position and off your fuel flow.

I hope like this we can easily tune the carburetor for better mileage. Pls test it out give your feedback. Im sure its waste to trust these ASC guys. I think no one know about exact tuning. Only when the factory settings would be the correct one.

that diagram is 180 degree rotation only. but for one full round u shud treat as 360 degree. u need check every .25 turns till u check between 2.0 to 3.5 turns. Dont consider 180 degree shows 3.5. you have to calculate for every 180 degree rotations. And fix up which point gives more mileage.

I dont understand what do u say.......K tell me whether 2.0 Turn Means 180 Degree or 360 degree????? I followed u r diagram to keep 2.0 turns and later adjusted to 2.5 by seeing the RPM....Is it correct?? Plz tell as i dnt want to mess with my dads byk :P

Thanks. ( though its kinda foolishness to ask this question as the service manual clearly mentioned the recommended plug(PRZ9HC) but as some of the people assured me to use the (PRZ7HC) ones thats why i am little confused)

Thanks. i searched some shops for the right plug specified in my manual but i could not found any. in every shop they are giving some random plugs by just asking "which bike i have". even in the service center the guy told me PRZ7HC & PRZ9HC are same. :X

Does any one knows where to get the right plug in kolkata??? until then i am continuing with this one.

One more thing after tuning the pick up has dropped, i need to accelerate harder to get in speeds and when closing acceleration i feel that the bike dragging slight backwards. is it ok? or i am on the very leaner side???

@paul.

my recommended plugs are Champion PRZ9HC or BOSCH UR4AC.

and

Thanks. i did as you advised . but due to non availability of RPM gauge in my bike i am having difficulties to get the optimum point.
as you said

1.i raised the idle somewhat ( don't know it was 3000 or not,
2. then closed the fuel screw but when closing the screw the engine dies.
3. then i turn the screw 1/2 times out and start the engine, at that point engine is very unstable and likely to be shut off.
4. Then i turn the screw outwards slowly ( 0.25) turns at one go. at around 2.25 turns the engine sound raises, at 3.25 turns the sound raises little more and it stays almost same up to 4 turns and afterwards it decreases slowly.
5. i have set it to 2.5 turns out and decreased the idle slight above the point where the engine starts to stall.
( i decided the idle point in this way : i rev the accelerator slightly and leave it on idle and after 15-20 seconds when i try to accelerate in one go ( slight harshly ) and the engine responds instantly otherwise the engine takes some lag to respond. )

I hope you understood what i did. please correct me if anything is not proper in the process.