Re: "Wire in carb"?

Query Approved.

As the air is having less oxygen and at less atmospheric pressure the engine pulls more quantity of fuel from the carburettor resulting in a rich mixture leading to jerking and less pulling power of bike. So the local mechanics put a small piece of thin wire through the main jet to reduce the flow of fuel and thus leaning of mixture which leads to proper combustion and bike starts behaving normally. Simple as that!

Cheers!
VJ

Re: "Wire in carb"?


follow the link Replacing the KB-RTZ offroad specials - My Hero Impulse - Page 2 - Team-BHP

Re: "Wire in carb"?

So, is it mandatory to do this every time someone rides to Leh? I rode mine Royal Enfield Standard 350 without any mods and it worked fine. While I experienced loss of power at few points, but it did not stop bike. Would be interesting to know if there is any other simple mechanism to control fuel intake apart from adding a piece of wire?

Re: "Wire in carb"?

I just want to add one thing, we feel low power due to less oxygen, same even if we have FI, its just that FI reduce the amount of fuel supply also to avoid the malfunctioning due to more fuel burn & depositing carbon on spark plug, right?

Re: "Wire in carb"?

You see CV carbs do adjust themselves quite to an extent and as such there shouldn't any problem, whereas a slide carb, will have real trouble. Even CVs with poor jetting main to pilot ratio do tend to suffer. But this shouldn't be a problem with modern bikes, they handle good for the most part.

Cheers!
VJ

Re: "Wire in carb"?


a carb wil have two jets : slow jet/idle jet and main jet.

now post 10,000 feet the oxyen level drops drastically. inspite of making the afr leanest as possible from the AFR screw it is still plenty for the amount of oxygen available.
so desi indian jugaad is " the mechs will pass a wire through the main jet making the area/volume less and it will further reduce the fuel supply.

now i have seen new bikes and old bikes with carb having issues and not having issues. bulls generally will feeel loss of power but wont be in a state where one cant ride at all.
however bikes like implusde , zma etc .. high revving bikes with shorter strokes tend to show loss of power to an extent at times where they wont even budge in 1st gear.

this reduced fuel supply makes the burning efficient and the bikes runs fine. if you are handy with the carb then let the bike run until its fine you can make the changes yourself.
we had this zma give up on baralach-la and tang-lang la however the stock implulse went fine after i made the mixture lean but the same did not work on zma hence had to put a wire and post that it ran like a cheetah...

Re: "Wire in carb"?

To reduce fuel supply at higher altitude a wire is placed inside the main jet. So that afr is adjusted. Another method is to remove air filter at such extreme altitudes so that engine gets enough air. But this will make carb dirty and need to clean it throughly after the trip.

Re: "Wire in carb"?

removing the air filter will not only make the carb dirty but in places like leh-ladakh the dust will go inside the engine as well.. you are looking forwards for a busted engine soon.