ZMA Higher Altitude Issue - Solution - Page 2 - xBhp.com : The Global Indian Biking Community

santoosh · 09-26-2009, 11:39 PM

Nice piece of Jugaad , but It would be better to carry a smaller main jet and fix it rather than a copper wire , using a 115 jet would do the job.

Santa

shrinathrao · 10-06-2009, 02:45 PM

DOes the new ZMA R will also face the same issue, was wondering as its already with a FI

inder.cool · 10-06-2009, 02:48 PM

Quote:

Originally Posted by shrinathrao

DOes the new ZMA R will also face the same issue, was wondering as its already with a FI

ZMA - R is a carbed one...this new one launched is named as "ZMR"

..and i guess it shudnt face problem bcoz of its Fi engine..

Coplay@180 · 02-23-2010, 12:09 PM

Thats a Nice share Rockky...
I haven't met Gopi yet

Still living with ISSUES on my ZMA. Mileage the worst problem.

has dropped from 42kmpl to a constant 30kmpl now

nirav46 · 02-23-2010, 10:38 PM

The Zma Faces the issues as it has the biggest stock main Jet (size 125) which increases the air flow to quite an extent. As some one mentioned earlier putting the copper wire is a juggad to more to a smaller jet at high altitude, more sensible will be to carry a smaller jet when on such high altitude rides

princesirohi · 06-04-2010, 10:00 AM

real nice info here......but the whole idea of putting a wire in the hole is that engine is getting more fuel and less air......and to correct this we had reduced the petrol flow.........can't we simply set it for more leaner mix.....without changing the jet or putting a copper wire..........simply set the carb to leaner mix................guys wht do u think....

harikeshpk · 06-04-2010, 09:00 PM

yes its possible, but requires some skill which the local mechs don't have. easy way out to put wire. better be safe than sorry principle.

prasir · 07-22-2010, 07:20 PM

Rather making chnages and playing with the carborator, what i did was pretty simple - just take out the outer cover of the air filter, and you are back with all the power. Don't worry there is no way the dust can enter into the engine, and yes when you are back on the normal roads put the air filter back into it's positoin.

Old Fox · 07-24-2010, 07:15 PM

Quote:

Originally Posted by nirav46

The Zma Faces the issues as it has the biggest stock main Jet (size 125) which increases the air flow to quite an extent. As some one mentioned earlier putting the copper wire is a juggad to more to a smaller jet at high altitude, more sensible will be to carry a smaller jet when on such high altitude rides

A smaller jet is THE right solution but getting one is next to impossible. HH don't keep such stuff with them and the thread profile of other makes do not match. So for the time being, putting a wire through the jet to reduce fuel flow is the only viable and available option in and around Leh.

Quote:

Originally Posted by princesirohi

real nice info here......but the whole idea of putting a wire in the hole is that engine is getting more fuel and less air......and to correct this we had reduced the petrol flow.........can't we simply set it for more leaner mix.....without changing the jet or putting a copper wire..........simply set the carb to leaner mix................guys wht do u think....

Quote:

Originally Posted by harikeshpk

yes its possible, but requires some skill which the local mechs don't have. easy way out to put wire. better be safe than sorry principle.

You can only 'tune' for lesser fuel flow from the main jet by changing the jet with a smaller one. True, some changes can be made by lowering the needle position in the throttle slide but the ZMA default setting is already low enough. Going just a step lower makes no big difference. The 'tuning' you are referring to apparently is the air-screw adjustment found on carbs. The air-screw primarily adjusts the idling mixture and has no effect beyond 1/4 throttle operation. And idling is not the real issue with the ZMA at high altitude.

Quote:

Originally Posted by prasir

Rather making chnages and playing with the carborator, what i did was pretty simple - just take out the outer cover of the air filter, and you are back with all the power. Don't worry there is no way the dust can enter into the engine, and yes when you are back on the normal roads put the air filter back into it's positoin.

Just removing the air-box cover makes next to nil difference to the air/fuel ratio richness in the ZMA. Even entirely removing the air filter from the intake makes only a small difference. The ZMA engine runs very rich at high altitudes, especially above 14,000ft. And the only way of getting the air/fuel ratio to workable levels is by reducing the fuel flow vis-a-vis a smaller main jet or a wore through the existing jet.

inder.cool · 07-24-2010, 08:25 PM

Quote:

Originally Posted by Old Fox

A smaller jet is THE right solution but getting one is next to impossible. HH don't keep such stuff with them and the thread profile of other makes do not match. So for the time being, putting a wire through the jet to reduce fuel flow is the only viable and available option in and around Leh.

By far the best solution .. rather than the wire alternative!!

Quote:

Originally Posted by Old Fox

The 'tuning' you are referring to apparently is the air-screw adjustment found on carbs. The air-screw primarily adjusts the idling mixture and has no effect beyond 1/4 throttle operation. And idling is not the real issue with the ZMA at high altitude.

True!! This 'air-screw-tuning' is of NO help! All the problems still remain..believe me..I tried every possible thing with that turning the screw and nothing helped..

Quote:

Originally Posted by Old Fox

Just removing the air-box cover makes next to nil difference to the air/fuel ratio richness in the ZMA. Even entirely removing the air filter from the intake makes only a small difference. The ZMA engine runs very rich at high altitudes, especially above 14,000ft. And the only way of getting the air/fuel ratio to workable levels is by reducing the fuel flow vis-a-vis a smaller main jet or a wore through the existing jet.

A small correction here, the removal of the air-filter does help in getting back the power as while climbing Chang-La(17,000 + ft.) I had removed the air-filter and the bike was running absolutely fine with no issues at all. However, on getting back to Leh fitted back the air-filter and put a copper wire in the main-jet!

09-26-2009, 11:39 PM	#11 (permalink)
santoosh toure- r15 Join Date: Jun 2004 Location: Bangalore Posts: 978	Nice piece of Jugaad , but It would be better to carry a smaller main jet and fix it rather than a copper wire , using a 115 jet would do the job. Santa __________________ 04 Pulsar 180 V1 06 Comet GT 250 07 ZMA-R 08 YZF-R15 10 Access 11 ....?....--> GT-650

10-06-2009, 02:45 PM	#12 (permalink)
shrinathrao Toreador Rider Join Date: Dec 2008 Location: pune, goa Posts: 2,364	DOes the new ZMA R will also face the same issue, was wondering as its already with a FI __________________ If you don't ride in the rain, you don't ride. ~Author Unknown Don't argue with an 18-wheeler. ~Author Unknown Gray-haired riders don't get that way from pure luck. You don’t stop riding because you’re getting old, but you get old when you stop riding.

02-23-2010, 12:09 PM	#14 (permalink)
Coplay@180 Senior Member Join Date: Dec 2008 Location: B'lore-Chennai-Coimbatore Posts: 728	Thats a Nice share Rockky... I haven't met Gopi yet Still living with ISSUES on my ZMA. Mileage the worst problem. has dropped from 42kmpl to a constant 30kmpl now __________________ Being a Speed Demon aint worth it anymore..!!

02-23-2010, 10:38 PM	#15 (permalink)
nirav46 On A Rocket ;) Join Date: Sep 2008 Location: Powai,Mumbai Posts: 107	The Zma Faces the issues as it has the biggest stock main Jet (size 125) which increases the air flow to quite an extent. As some one mentioned earlier putting the copper wire is a juggad to more to a smaller jet at high altitude, more sensible will be to carry a smaller jet when on such high altitude rides __________________ X=need for more

06-04-2010, 10:00 AM	#16 (permalink)
princesirohi 18...till i die.. Join Date: Jan 2009 Location: Aamby Valley City, Lonavala, Pune, Maharashtra Posts: 2,847	real nice info here......but the whole idea of putting a wire in the hole is that engine is getting more fuel and less air......and to correct this we had reduced the petrol flow.........can't we simply set it for more leaner mix.....without changing the jet or putting a copper wire..........simply set the carb to leaner mix................guys wht do u think.... __________________ Nothing is worth doing unless it has the potential to f** up your entire life........* --------- All About Tyre Sizes ____ Spark Plug Info Spark Plug Cross Rererence Table for Heat Range Between Different Brands ____ Pirelli & Michelin Tyres for Indian Bikes ASHTAVINAYAK & SHIRDI BIKE TOUR WITH WIFE

06-04-2010, 09:00 PM	#17 (permalink)
harikeshpk Impossible is Nothing Join Date: Sep 2009 Location: Thiruvananthapuram Posts: 456	yes its possible, but requires some skill which the local mechs don't have. easy way out to put wire. better be safe than sorry principle.

07-22-2010, 07:20 PM	#18 (permalink)
prasir Junior Member Join Date: Oct 2008 Location: Navi mumbai Posts: 17	simple solution Rather making chnages and playing with the carborator, what i did was pretty simple - just take out the outer cover of the air filter, and you are back with all the power. Don't worry there is no way the dust can enter into the engine, and yes when you are back on the normal roads put the air filter back into it's positoin. __________________

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