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**acs1207** · 08-27-2013, 07:39 PM

Re: Karizma/Karizma R

Originally posted by vijayvenkatesans View Post

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I don't think it fell off. I had showed it to a nearby mech when it stalled and I have a strong feeling that guy didn't put it back in. Will try that anyway. BTW won't it block the air flow? Sorry if it's a stupid question.

The rubber piece is to be put on top of the afr screw . Air doesn't go in that way . The afr screw goes into the supply path of fuel . The deeper it goes the lesser the fuel flow . Hence the 2.5 to 3.5 ( or 4) turns out .

Originally posted by AK3D View Post

All these questions are answered in this thread earlier

. If you (Or any participants here who are newcomers) own a ZMA, I strongly suggest you start reading from page 1... if not page 1, at least page 400-500, where the action hots up. The amount of information here won't be had for love or money, and certainly not at any other place. I can only say thanks to the members here who have been there and done that and have so kindly and selflessly shared that information.

Agree with that . I did it when I joined . And the pages are a treasure of info .

**vijayvenkatesans** · 08-28-2013, 02:29 PM

Re: Karizma/Karizma R

Originally posted by acs1207 View Post

The rubber piece is to be put on top of the afr screw . Air doesn't go in that way . The afr screw goes into the supply path of fuel . The deeper it goes the lesser the fuel flow . Hence the 2.5 to 3.5 ( or 4) turns out .

Agree with that . I did it when I joined . And the pages are a treasure of info .

Oh okay. Thanks.
[MENTION=52772]AK3D[/MENTION] I have read around 500-600 pages of this thread. Sometimes I know that the answer is there in this thread but I have no idea where. And it just isn't practical to go around read the entire thread again to get the answer. Sometimes google search rescues but there is just too much other info sometimes. Ability to search just the current thread would go a long way.

**vijayvenkatesans** · 08-28-2013, 06:50 PM

Re: Karizma/Karizma R

Okay, looks like the problem isn't solved. Yesterday it was running fine after I took it from the service centre. Rode around 12 km. Now after a gap of around 20 hours, when I tried starting it, it idled fine but died when I accelerated. One more thing I noticed is that, the engine doesn't idle smoothly. On starting, it briefly halts at a lower RPM and after a sec or two rises and settles at the intended RPM. When on choke, that lower RPM is 2k and the intended is 4k. Without it, it is 1.1k and 1.5k. After reaching the intended RPM also, the needle keeps fluctuating for between 1.5k and 1.6k. On accelerating, the RPM starts to reduce. If I leave it quickly after it starts reducing, it rises back up, else the shuts off. I idled the bike on choke for literally 4 minutes to warm it up and see if the issue is resolved, but no luck. Then I tried to start the bike with the accelerator turned to the max. Obviously it didn't start. After that it failed to start even when I tried without turning the throttle. I tried for a couple of times more and then gave up.

Any ideas on what could be wrong?

**acs1207** · 08-28-2013, 07:14 PM

Re: Karizma/Karizma R

Originally posted by vijayvenkatesans View Post

Okay, looks like the problem isn't solved. Yesterday it was running fine after I took it from the service centre. Rode around 12 km. Now after a gap of around 20 hours, when I tried starting it, it idled fine but died when I accelerated. One more thing I noticed is that, the engine doesn't idle smoothly. On starting, it briefly halts at a lower RPM and after a sec or two rises and settles at the intended RPM. When on choke, that lower RPM is 2k and the intended is 4k. Without it, it is 1.1k and 1.5k. After reaching the intended RPM also, the needle keeps fluctuating for between 1.5k and 1.6k. On accelerating, the RPM starts to reduce. If I leave it quickly after it starts reducing, it rises back up, else the shuts off. I idled the bike on choke for literally 4 minutes to warm it up and see if the issue is resolved, but no luck. Then I tried to start the bike with the accelerator turned to the max. Obviously it didn't start. After that it failed to start even when I tried without turning the throttle. I tried for a couple of times more and then gave up.

Any ideas on what could be wrong?

Have you checked the spark plug and cdi connections ?

**vijayvenkatesans** · 08-28-2013, 08:59 PM

Re: Karizma/Karizma R

Originally posted by acs1207 View Post

Have you checked the spark plug and cdi connections ?

The mechanic removed and refitted the spark plug the last time this problem occurred with no result.

I tried the CDI connections now. The pic above is of the right side under the seat. I am not sure which one is the CDI, so removed the plug in red and refitted and pushed in the plug in blue as much as I could. No change. The bike still stalls on throttle. On choke it goes till 5k from 4k if I open the throttle slowly, otherwise it dies. Without choke, it dies at 1.8k.

**psr** · 08-28-2013, 09:34 PM

Re: Karizma/Karizma R

Originally posted by vijayvenkatesans View Post

The mechanic removed and refitted the spark plug the last time this problem occurred with no result.

I tried the CDI connections now. The pic above is of the right side under the seat. I am not sure which one is the CDI, so removed the plug in red and refitted and pushed in the plug in blue as much as I could. No change. The bike still stalls on throttle. On choke it goes till 5k from 4k if I open the throttle slowly, otherwise it dies. Without choke, it dies at 1.8k.

Try this method....with the choke on and idling at 2 K Rpm. open throttle and see how the engine responds.....if it revs then your Pilot jet circuit is blocked or lean...if it stops the engine, then your AFR at lower RPM is high.....look for stuck slide...

**AK3D** · 08-28-2013, 10:19 PM

Re: Karizma/Karizma R

Originally posted by vijayvenkatesans View Post

Okay, looks like the problem isn't solved. Yesterday it was running fine after I took it from the service centre. Rode around 12 km. Now after a gap of around 20 hours, when I tried starting it, it idled fine but died when I accelerated. One more thing I noticed is that, the engine doesn't idle smoothly. On starting, it briefly halts at a lower RPM and after a sec or two rises and settles at the intended RPM. When on choke, that lower RPM is 2k and the intended is 4k. Without it, it is 1.1k and 1.5k. After reaching the intended RPM also, the needle keeps fluctuating for between 1.5k and 1.6k. On accelerating, the RPM starts to reduce. If I leave it quickly after it starts reducing, it rises back up, else the shuts off. I idled the bike on choke for literally 4 minutes to warm it up and see if the issue is resolved, but no luck. Then I tried to start the bike with the accelerator turned to the max. Obviously it didn't start. After that it failed to start even when I tried without turning the throttle. I tried for a couple of times more and then gave up.

Any ideas on what could be wrong?

I recall you had the AFR screw missing.
Was the AFR screw replaced?
Ensure it's an AFR screw meant for the ZMA (just in case the fit-it-all's at the ASC have put in something else for the time being). If it's ok, then screw in the AFR gently clockwise till it stops, and then out by 3.5 full turns. See if that makes a difference.

**acs1207** · 08-28-2013, 10:47 PM

Re: Karizma/Karizma R

Originally posted by vijayvenkatesans View Post

The mechanic removed and refitted the spark plug the last time this problem occurred with no result.

I tried the CDI connections now. The pic above is of the right side under the seat. I am not sure which one is the CDI, so removed the plug in red and refitted and pushed in the plug in blue as much as I could. No change. The bike still stalls on throttle. On choke it goes till 5k from 4k if I open the throttle slowly, otherwise it dies. Without choke, it dies at 1.8k.

Originally posted by psr View Post

Try this method....with the choke on and idling at 2 K Rpm. open throttle and see how the engine responds.....if it revs then your Pilot jet circuit is blocked or lean...if it stops the engine, then your AFR at lower RPM is high.....look for stuck slide...

Originally posted by AK3D View Post

I recall you had the AFR screw missing.
Was the AFR screw replaced?
Ensure it's an AFR screw meant for the ZMA (just in case the fit-it-all's at the ASC have put in something else for the time being). If it's ok, then screw in the AFR gently clockwise till it stops, and then out by 3.5 full turns. See if that makes a difference.

Probable causes...weak current ( check spark plug for healthy spark ) , lean mixture(afr screw / stuck slide / damaged air supply route / insufficient fuel due to clogged carb ) . Please check and post reply .

**New guy** · 08-29-2013, 11:07 AM

Re: Karizma/Karizma R

Hi,

Request experts to comment on my AFR judging from the spark plug pics. This is after after ride of 20+ kms post setting the AFR.

**vijayvenkatesans** · 08-29-2013, 12:03 PM

Re: Karizma/Karizma R

Originally posted by psr View Post

Try this method....with the choke on and idling at 2 K Rpm. open throttle and see how the engine responds.....if it revs then your Pilot jet circuit is blocked or lean...if it stops the engine, then your AFR at lower RPM is high.....look for stuck slide...

Thanks for the input sir.
It revs till 4.5k and dies if I throttle any more (it dies at the same RPM even if the idling is at 4k on choke). I guess I can tell the ASC guys to clean the carb. Can I turn on the choke, keep the idling at 2k and drive it till the ASC (~8km)? Would it be possible?

----consecutive posts auto-merged-----

Originally posted by AK3D View Post

I recall you had the AFR screw missing.
Was the AFR screw replaced?
Ensure it's an AFR screw meant for the ZMA (just in case the fit-it-all's at the ASC have put in something else for the time being). If it's ok, then screw in the AFR gently clockwise till it stops, and then out by 3.5 full turns. See if that makes a difference.

Yes, the screw was replaced. It looks the same as the one in the image that you had shared. The bike is in the office parking lot and it's a bit congested here to reach the AFR screw. Will check that once I get it out of here.

----consecutive posts auto-merged-----

Originally posted by acs1207 View Post

Probable causes...weak current ( check spark plug for healthy spark ) , lean mixture(afr screw / stuck slide / damaged air supply route / insufficient fuel due to clogged carb ) . Please check and post reply .

Thanks for the inputs.
I am not too confident yet of doing these myself except the AFR screw thing, lest it should backfire because of me screwing up something. Will call the ASC guys and ask them to have a look.

**psr** · 08-29-2013, 04:57 PM

Re: Karizma/Karizma R

Originally posted by vijayvenkatesans View Post

Thanks for the input sir.
It revs till 4.5k and dies if I throttle any more (it dies at the same RPM even if the idling is at 4k on choke). I guess I can tell the ASC guys to clean the carb. Can I turn on the choke, keep the idling at 2k and drive it till the ASC (~8km)? Would it be possible?

Yes you can drive till the ASC under this condition..From what you have posted it sounds more like the Throttle Slide is stuck...

**vijayvenkatesans** · 08-29-2013, 06:34 PM

Re: Karizma/Karizma R

Originally posted by psr View Post

Yes you can drive till the ASC under this condition..From what you have posted it sounds more like the Throttle Slide is stuck...

Went and gave it to the ASC. It refused to climb slopes. Had to push it up from basement 2 to ground floor. Then drove with the least acceleration possible. Maintained the RPM at ~3k and drove till there. Let's see what they do. Saw Aneesh's DIY on how to clean the carb. Didn't want to screw anything up, so left it.

**New guy** · 08-30-2013, 12:40 PM

Re: Karizma/Karizma R

Originally posted by New guy View Post

Hi,

Request experts to comment on my AFR judging from the spark plug pics. This is after after ride of 20+ kms post setting the AFR.
[ATTACH=CONFIG]114390[/ATTACH]

Can anyone please comment on this?

**psr** · 08-30-2013, 02:48 PM

Re: Karizma/Karizma R

here is an image to help you understand about plug chop...

**AK3D** · 08-30-2013, 10:14 PM

Re: Karizma/Karizma R

Originally posted by New guy View Post

Can anyone please comment on this?

Yes, the plug seems out of focus......

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