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
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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....
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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.
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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.
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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.