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**psr** · 12-08-2011, 11:00 AM

Originally posted by ashwinprakas View Post

He's done the carb hole mod, so I guess 3.5's his current optimum tuning.

That and also the fact that i am trying to see how lean i can SAFELY take the AFR mix to....Many of my experiments have not been posted since they have NOT yielded appreciable results, or has too many variables which cannot be fathomed by others....those that are repeatable and consistent,and worthwhile only will be shared...

**ashwinprakas** · 12-08-2011, 11:06 AM

Originally posted by psr View Post

You have totally missed the point haven't you ?Even if you have a CBR 1000RR you will continue to have this problem,since you lack the ability to Judge distance and the Traffic....and the limitations of your's and the bike's .

Guess I've still got a VERY long way to go.

Yes I do experiment with my bike...there are many which I am afraid to post ,since this thread has members meddling with their bikes rather than enjoying the ride,....my posts may lead to trashing of their bikes since they do not understand the variables, in what I do .

Please do sir, if you find anything interesting then please do post, even though I take abit more time to catch up, am sure with apt effort I'll be able to cope.

And I believe seeing more interesting topics would prevent me from posting layman issue like the one before.

Replies in BOLD.

**ashwinprakas** · 12-08-2011, 11:14 AM

Originally posted by psr View Post

i am trying to see how lean i can SAFELY take the AFR mix to....

Since you've mentioned it. Here's what I observed while tuning the AFR.
There are three zones and the afr behaves differently in each of them.

0 - Engine at its leanest state, and RPM fluctuates some 400~500Revs.

0~1 - No difference above 0 and below 1, cause the RPM variance is 250Revs.

1~3.75 - Even though the margin is huge but theres no difference from above 1 till 3.75 cause the're be a fluctuation of 100Revs.

3.75~4.5 - Engine slowly becomes stable and at sharp 4 the needle becomes stagnant, but a bit above that and the RPM started to fall but was stagnant once the fall was over.

**psr** · 12-08-2011, 11:17 AM

Originally posted by ashwinprakas View Post

Since you've mentioned it. Here's what I observed while tuning the AFR.
There are three zones and the afr behaves differently in each of them.

0 - Engine at its leanest state, and RPM fluctuates some 400~500Revs.

0~1 - No difference above 0 and below 1, cause the RPM variance is 250Revs.

1~3.75 - Even though the margin is huge but theres no difference from above 1 till 3.75 cause the're be a fluctuation of 100Revs.

3.75~4.5 - Engine slowly becomes stable and at sharp 4 the needle becomes stagnant, but a bit above that and the RPM started to fall but was stagnant once the fall was over.

This is precisely the kind of observation to be avoided..All these readings of yours are when the engine is hot.....When it is cold the engine will have a different behavior,which you had not noted....

**Aneesh@4GHz** · 12-08-2011, 11:20 AM

@ ashwinprakas

Stop teaching PSR sir and let him continue his experiments.

**ashwinprakas** · 12-08-2011, 11:28 AM

Originally posted by psr View Post

This is precisely the kind of observation to be avoided..All these readings of yours are when the engine is hot.....When it is cold the engine will have a different behavior,which you had not noted....

True sir, had done the setting when the engine was at its hottest i.e soon after returning from college.
Cold settings didnt even come to my mind

, so I was right, Have a real long way to go.

OT.
Sir another doubt, isnt the optimum setting supposed to be set when the engines hot, or did I get that wrong???

Originally posted by Aneesh@4GHz View Post

@ ashwinprakas

Stop teaching PSR sir and let him continue his experiments.

Lol

, you misunderstood me, I wasnt trying to teach him, was just trying to be of assistance by providing my observations, but I guess psr sir's already got everything covered. So guess all we'd have to do is wait and watch.

**psr** · 12-08-2011, 01:44 PM

here is a pic., of a canister with tap for checking FE..graduations on the canister is for every 50ml, and costs 130/-.

**siddhesh** · 12-08-2011, 03:28 PM

Originally posted by psr View Post

here is a pic., of a canister with tap for checking FE..graduations on the canister is for every 50ml, and costs 130/-.

where can i get this ??

**psr** · 12-08-2011, 04:29 PM

Originally posted by siddhesh View Post

where can i get this ??

In Chennai most Automobile shops have them..it is locally made..
this is what outer cover looks like..

**Vishakh** · 12-08-2011, 10:08 PM

Originally posted by psr View Post

Any engine ,be it Carburetor or injected cannot tolerate instant WOT the way you have mentioned,without pinging.The reason is the sudden opening of throttle valve allowing more air to enter will instantaneously make the AFR very lean..esp., in ZMA with WOT there will be a sudden decrease of vacuum in the venturi and the throttle slide will actually drop down reducing the petrol flow. It takes about 2 to 3 seconds for the slide to respond to the new value of Vacuum,which even then will be lean due to WOT...
So you have to feather the throttle to accelerate and not do Brutal WOT twist...this is not a flat slide carb...understand the bike,and what it can and can not do.
In 5th gear at 4 k RPM there is sufficient torque and pull to overtake another vehicle on the road....unless you are doing street dragging, which needs a different engine altogether...not a long stroke one like ZMA.
For the kind of response you are expecting ,sell your ZMA and buy a Honda CBR 600 RR or better still CBR 1000 RR.

Originally posted by SriramEfunds View Post

@Ashwin - Guess you are mixing two things here. PSR has clearly stated the mechanical principles as how it works. Requesting situation based solution is just making this whole thread a gimmick. Learning principles of automobile and how you apply it while on road depends on an individual. Understanding the limitations of ZMA and consciously riding is what expected and it is considered sane riding.

To your questions, the road is filled with morons and it doesn't matter KL or TN, they are everywhere. Even if you have powerful ride, would still face a surprise from any direction. So the bottom line is WE need to be more deligent when it comes to riding.

Many times you have gone overboard with your constant quest for more power out of ZMA is something unwarranted.

Coming back to the issue. I also faced this pinging/pistoning issue while did a sudden burst to catch up the signal. Understood that this happens only when sudden acceleration. I'm used to this on my 2 stroke. After optimum tuning of carb, this pinging noise had reduced but never without it.

I 100% agree with what both of you said. For me the bike has been upto my expectations and there is no meaning expecting sudden response from a long stroke engine, that too carb. The bike has its limitations we cannot expect a less than 1 lakh priced 225 cc bike to behave like an R1.

I haven't even touched my AFR screw till date for me the tuning is fine and the plug is dark brown so its rich. Never faced any problems even during overtaking heavy vehicles, for a 225 cc it pulls effortlessly and the bike has good torque too.

For something available at that price the bike is just AWESOME! after all I can't get an R1 for 90k

.

**ashwinprakas** · 12-10-2011, 01:51 AM

**Removed**

Sorry.

**psr** · 12-10-2011, 12:38 PM

when will we learn to provide useful pertinent information ,that can benefit the normal members of the thread ? Spamming the thread will drive away those who are interested to learn , and share, and those who are contributing....we have already lost OF sir who no longer contributes to this thread.......this thread seem to be on a one way dead end.

**curse** · 12-10-2011, 07:08 PM

Help

I need two sets of disc pads and zmr tensioner with gasket, these are not available here.Can anyone courier them to me,will be very helpful.Will transfer the money through net banking.

**BOND_001** · 12-10-2011, 08:45 PM

Originally posted by curse View Post

I need two sets of disc pads and zmr tensioner with gasket, these are not available here.Can anyone courier them to me,will be very helpful.Will transfer the money through net banking.

where are you from curse?,pads of tvs rtr is a direct fit if you can get them in your place of stay.

**curse** · 12-10-2011, 11:15 PM

Currently working in Chhatisgarh.I am using RTRs pads but not satisfied with them.

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