well..well.. hh engineer tellin all dis bull$hit!!! ha!!

Thanx for backing up man.

Wow, Is that your answer?? Show more of that stinkin attitude and no one will be willing to help you out. Then again why do you need help when you know everything and what you dont know about Mr. Kannan will help you out there?

EDITED: Removed a few offensive statements.

nobody buying a zma wud care abt the mileage....atleast i dont...
my bike gives me 30..which i guess is pretty good...

less mileage help..

hey dudes please tell me a list of things i shud check on with as to increase my bikes mileage. its giving me 27.5 kmpl. please throw sum light on this topic.

Aha, a post 8 years old... But it was fun reading through.

My steed - Karizma ZMR (Pearl white)
ODO reading - 9000 kms
Bought on - 09/01/2011 (13 months)
KMPL (city) - ~42
KMPL (highways) - ~45

Note - I never exceed 70 in city and maintain speeds between 70-80 on the highways with occasional bursts to triple digits...
Max speed touched - 119 kmph.

Which bike? Anyways, 2 Rules are there:

1. Don't touch the carburettor unless you're sure there's a problem in it OR it has been mis-tuned by someone for sure.

2. If you're sure that it has a problem/ mis-tuning that service personnel don't attempt to correct, then do something about it yourself:

Your bike's Carb should be having 3 major screws (speaking about BS26/ UCAL): AFR, Idle RPM and drainage. See them below:



Do these steps to adjust it:

1. Switch the fuel knob to off and drain the carb's dirty fuel by opening the drainage screw for 30 seconds or so. Let the fuel flow but be very sure that no naked flame/ heat source is nearby. Then, tighten the drainage screw back and switch on the fuel.

2. Tighten the AFR screw fully (towards right) and then unscrew it full 3 circles (1080 degrees).

3. Ride around the town for 4-5 kms in hot weather, and then adjust the Idle rpm screw so that it shows 1500 rpm idling while the engine is heated up.

4. Again the next morning, see if your bike starts in first crank. If it starts with rpm needle around 1000-1100 or so, then your work is done and leave it like that! If not, proceed to Step 5.

5. If the rpm is too high in the morning start (like above 1200), adjust AFR screw towards right (tighten it by 0.25 circle) until it is 1000-1100 rpm.
OR
If it doesn't start in the morning start, adjust the AFR screw towards left (loosen it) in small steps (0.25 circle) and crank it after each attempt,

After getting it started at 1000 rpm or so, go back to step 3 (ride it for 4-5 kms, adjust idle rpm again to 1500) and come back to step 4, UNTIL Your cold start shows 1000~ rpm and heated up engine idles at 1500~ rpm.

TUNERS NOTE: Be aware that morning start+ idling also depends on the season, Oxygen in the atmosphere and the air temperature. This guide is ONLY to correct some extreme mistunings to the carb. Also, different bikes have different idlings, so adjust accordingly.

Re: how to check ur karizma is perfectly tuned or not.

Request the Mods to delete or atleast change the name of the Thread as its grossly misleading and goes against all the good work/research done by senior members on Karizma R Ownership thread.

Re: how to check ur karizma is perfectly tuned or not.

I have tried adjusting the AFR screw to maintain the rpm at 1000-11000k. But usually what happens is every morning I start the bike and the moment I stop accelerating, the rpm goes down and the engine stops. Now if I am tightening the AFR screw even a bit at that moment and get back to riding. it usually leads to sudden rise in RPM when I hold the clutch in rolling motion. It feels as if the bike is reving itself, though i am just holding the clutch. The solution to this I found was, I try not to fiddle with the AFR any further and drive the bike as I left it the previous day. So after a km or two, when I halt at a signal or something and when I put the bike on Neutral and leave the clutch. The rpm needle is happily dancing between 1-1.1k. . Even my mechanic suggested that when you start the bike early morning, rev it for a moment and then start driving. Any suggestions guys, anyone facing similar problems?

Re: how to check ur karizma is perfectly tuned or not.

Unless its extremely cold weather, there's no need to rev hard in the morning. Idling is the way to make sure the oil circulates the engine.

Secondly, are you sure you're not confusing AFR screw with Idle RPM Screw?

Thirdly, When I typed the quoted post 3 years ago, I didn't know but there's one more (more reliable) way to get a good AFR. Its much more easy, and described below.
Its a one day process and much easier to understand & apply:-

1. The engine should be slightly hot. Idle-run the engine for 2 minutes for it. Then, tighten the AFR screw fully using a screwdriver, so that the mixture becomes lean.

2. Twist the Idle rpm towards high rpm. It should show 3000 rpm in the console. You will see that due to lean mixture, the rpm needle is unstable i.e. it flickers up and down. For now, this is normal but keep following the steps...

3. Loosen the AFR screw while the bike is idling in neutral. You will see that the rpm flicker will reduce gradually....

4. After about 2 turns, keep loosening it but slowly, about 0.25 & even 0.1 turns per time, and watch rpm needle even more carefully for the flicker.

5. When the bike's idling stably and the tachometer isn't flickering up and down, then you've got the right mixture.

6. Drop the idle rpm to around 1500. On the next day, after using the bike for about 5-10 kms, re set the idle rpm to 1500 again.


This is a 1 day process and overall much better way to tune AFR, than the earlier Trial-Error Method. Try it and let me know what happened.

Re: how to check ur karizma is perfectly tuned or not.

I guess I am confused with the AFR and the idle RPM screw. I was addressing to the idle RPM screw actually because that is the only screw out of both, which is accessible with bare hands(without the screw driver). It is to our right bottom, when we are sitting on the bike.

I am eagerly waiting to try the method you mentioned. One query from the point no. 2, should i increase the idle rpm so much that it flickers 3000 and above or below?
I'll surely post the results after i do this.

Re: how to check ur karizma is perfectly tuned or not.

Idle rpm screw directly affects the throttle. In fact, you might see a screw affecting the throttle wire end itself.

Drainage screw, when opened lets some fuel out. Its risky to open this screw while engine is running, so don't experiment with it unless you know which exact screw is it. It is usually tight in an ok tuned bike. Its usually the bottom most screw.

AFR screw can be tightened further however, and can be loosened too.


Actually, I had a good picture attached in my post on this thread. But after Imageshack went the money-way, the images were removed. And I can't find a backup too.
If possible, please attach a clear picture of the carburetor of your bike.


Yes, your idle rpm can be 3000 or slightly around it, but not much above it.
It doesn't matter much, because you can change idle rpm anytime, but your main target is AFR screw.

If AFR screw is not set ok, it will affect the long term health & life of your engine.
Idle rpm can be set to any rpm safely, but it affects mileage (very slightly only) and rideability through slow corners.

Re: how to check ur karizma is perfectly tuned or not.


The screw with black plastic head and spring is what I am referring too.