Hi,

Returned yesterday from 1500km solo trip to Munsyari ( Altitude- 9000ft )

Route- Lucknow-pilibhit-champawat- pithoragarh- Munsiyari

After getting carb choke problem sorted out i started my trip, for few 100 Kms all was well but again bike started missing/jerking, I continued my journey anyway. On plains I had no major issues apart from hiccups in acceleration but as hills started bike refused to go above 4500 RPM while climbing gradients ( this is the point where missing/jerking happening ). Though bike was climbing gradients in 3rd/4th gear at 4500RPM but at slow speed 40/45km/hr but not able to go further in revs and speed on gradients.

When I reached at highest altitude 8000-9000ft, I felt that all power lost and could do in 2nd and 3rd gear only at 4500RPM, somehow slowly reached munsyari.

I was so sad for this issue that I clicked only 2 pics of entire trip...

After returning Lucknow I called once again Hero motocorp engineer and he told me to replace carb with new one in warranty.

Guys, now I dont trust anyone in Hero or SC, pl suggest what could be the real issue. Any ignition system related, timing relatedor others.

Experts pl help.

The bulbs finally arrived. ! Cant wait to try it out.


[ATTACH=CONFIG]149412[/ATTACH]

Installed the bulb today. Took care not to touch the bulb at all .

The difference is HUGE!! Love the improvement. Thanks for all your inputs guys.

However, when the HLs on the horn feels very weak ( The stock horn setup is quite pathetic to begin with) . How does one solve this? Is a battery and horn upgrade called for?

Thanks for any inputs you can provide. Cheers!!

Today replaced carburetor in warranty but same problem continues.

Guys I am fed up now, pl help what to look for.

Since you have replaced the carb, I assume there is no issue with slide movement. Did you check accelerator cables? Does the throttle grip move freely and return to normal when you leave? Also, check the fuel cock and fuel tank for any debris. I feel enough fuel is not being supplied in to the firing chamber. What was the problem you got with choke?

Hi Ravi, checked acclerator cable, fuel supply, fuel tank deposits etc...all ok.

When this missing prob started, choke also not operating, I mean when applying full choke RPM not going above 2k.

Should I try replacing air filter with new one?

Approved and merged!

2.5 turns? How can that be rich? I thought 3.25-3.5 turns was the optimal AFR.

Carb tuning varies from bike to bike. So 3 turns in some bike doesn't mean same will run for you. For tuning follow the procedure that i am telling. Warm up the engine by riding for 4-5 km. Ensure you are in an open area, increase the idle to 3k rpm with the idle screw. Now slowly with a thin screwdriver(use a line tester) turn the air fuel screw first in anticlockwise direction very slowly(1/16th of a turn at a time). Keep an eye on the tachometer. Check if the idle is increasing or decreasing. If it is decreasing then turn in reverse direction. Try to find the highest rpm by turning the air fuel screw. When you obtain the highest idling then turn the idling knob so that engine idles at 1.2k rpm. This will be your optimal setting.

3~3.5 turns of AFR screw is normal setting for a ZMA-R 30mm carburetor... Increase in RPM cold to Hot will be 150~250 RPM more. If it is more than indicated variation , then re-tune the AFR slightly rich by turning the AFR screw 90 degrees ANTI CLOCKWISE.

Is the choke problem solved? Is it going to 4k now with choke on? If not, I think there is some problem with fuel supply from tank. Check it again.

Regarding air filter, if you have not changed, change it and see.

Ravi, engine is shutting down while applying choke on running engine at idle speed and engine not starting while applying choke and starting off engine.

Replaced air filter with new and had ride of 25 kms. Now missing is not there between 4k to 5k rpm, but now choke is not working.

Most probably your battery is 7ah. I would recommend 9ah. But I think if your battery and horn is ok then it should work provided you run your bike long enough to get the battery charged during day time. Check the battery .

And dont get me talking about 'stock anything' on the ZMA.

Sent from my SM-G7102 using Tapatalk

Today replaced carburetor in warranty but same problem continues.

Guys I am fed up now, pl help what to look for.

Installed the bulb today. Took care not to touch the bulb at all .

The difference is HUGE!! Love the improvement. Thanks for all your inputs guys.

However, when the HLs on the horn feels very weak ( The stock horn setup is quite pathetic to begin with) . How does one solve this? Is a battery and horn upgrade called for?

Thanks for any inputs you can provide. Cheers!!

Hi Ravi, checked acclerator cable, fuel supply, fuel tank deposits etc...all ok.

When this missing prob started, choke also not operating, I mean when applying full choke RPM not going above 2k.

Should I try replacing air filter with new one?

To solve your problem you can run horns using relay setup directly from your 7a battery.
Because your stock wiring is not capable of taking that much load.