Is JC Road far away from there? Sorry I'm still getting used to Bangalore. Seldom go there.

Thanks for the info
i was really confused in this matter..

Sorry bro, but what a confusion there!

You could have a one million Ah battery: if connected to any power consumer with a too thin wire (and/ or too long), you will loose voltage as your wire will have a too high resistance and the item needing this power will not work correctly....and/ or your too thin wire will heat and eventually burn, destroy it's insulation, etc..and/ or the switch controlling that will burn too. NOTHING to do with the size of the battery, and NO damage to a 1 Ah. nor to a 100 AH one. The only thing where the battery gets "concerned" is if you try to drain too much amperage out of it, but this has nothing to do with the existence of a relay or not (although a too small wire will limit the amperage thus protecting a too small battery....but we would be getting on O.T. nitty-gritty discussion there!)

All what a relay does, is to allow a thin (and/ or long) wire to go to a small switch able to cope with small amperage only, while a (usually) shorter, bigger wire goes from the battery to the consumer, contact being given by the sturdy relay able to cope with high amperage (and eventually voltage) instead of the flimsy switch whose only job is to control the relay. Then the consumer gets all the needed power for it's proper functioning.

I think, u mean to say that a relay is nit necessary.. ??
see, when i fitted the horns, the sound would start to die out after a couple of uses.. Then what should i do if nit use a relay ??
battery AH has to do with this man.. These operate without any problen in a car, which has bigger batteries..
the problem comes in bike which have smaller AH batteries..

Use a relay. Its better if you use it. What it does is that it allows a small amperage current, controlled by the horn ring & to switch at the relay, rather than the full load going up & down the wiring in the column. The heavy current is somewhat directly taken straight from the battery to the relay, then to the horn, bypassing the column and reducing the arcing and wear there.
A safe thing.

Sir ,especially in this case the battery the size ofbattery is point of concerned since using two bigger wind tone Horn will draw more Amp from the stock battery!
i agree that that thin wire will not allow to pass that required amp to these horn and can ultimately burn up! but not because of resistance its due to the more current being drawn through the thin wires that,s why they can fail or the switch might fail and can Drain your battery quickly -as the current will be lost in the circuit in the form of heat
(by heating the wires and switch assembly)
so a separate relay and heavy gauge wire circuit is required in bikes!
but whereas in 4 wheeler the electrical circuits and switches are made of thicker gauge of wire to withstand the higher Amp of the battery and other working parts working on battery!

Hello guys just want to add a few points here.. I agree the amps play a role here and the use of relay as well.. to use a relay is, well, a good and safe thing indeed. So there's no argument on this, i guess. Now coming to our amps, our fz batt is of 5 amp and the roots windtone horns are also of 5 amp (2.5 amp per horn), i assume. So, based on this assumption, the horns, if blown continuously, should sound for about an hour or a bit lower, which means more than a normal commuting or driving day, or even two, because we don't use our horns for more than 3 secs or 5 secs at a time. And even I think maybe there's a problem with the query poster's battery because in no way a battery can die off or the horn may sound less (weak) just in a couple of uses. So, on the contrary, use of relay is not compulsory but if u have a better understanding with electronics, you'd definitely have one when you upgrade your horns or headlights or whatever on the upper side of stock configuration. Cheers.

Hi Touseef,
Rather than using ctr+c & ctr+v, always give a source of information. Here is the source.
I agree with Luke, relay is nothing but acts as a switch. What it does is take a relatively small amount of current to switch a high current load on & off. Inside the relay there is a coil which acts as an electromagnet when it is energized & closes the circuit. So if you don't use a relay, while using a high amp accessory the switch will be blown since it is not made for high load. The relay will draw a small current to operate & once the electromagnet is energized (switch is operated) you will have continuous high current supply to the accessory. Nothing to do with the capacity of the battery. You can add high amp switch & fuse in the circuit instead of using a relay, but it will be costly & relay is a simple & cheap solution.
Since I use aux lamps I use a relay. Here is a good video on automotive relays:

would it be good if I buy NGK iridium spark plug from PlanetDSG online as I am from Kolkata? It is quoted Rs. 550 .

Will yamaha factory shop install the spark plug if I go there? I think they will take the service charge....

Yeah as mentioned by abhijitkn, relays are just switches which can withstand high amps. You send a less voltage/current signal to the relay and it will in turn connect the battery to high amp load. So the battery to load connection is independent of operating switch.


So effectively you can have a low amp switch but can connect any high amp load to battery

Guys, has anybody tried Gulf oil's Pentatech? Any reviews for the oil?

I want to change my oil. Have been on Yamalube since my start. Any recommemdations?

Hi Alto,
I'm using NGK Iridium spark plug, except from cold start, I didn't find much improvement.
Check users manual, it is easy to install the spark plug. Just maintain the correct gap (use filler gauges), & do not tighten it much. Check online how to maintain the spark plug gap or else you will end up damaging the spark plug.

If there is not such performance improvement then there is no point installing it.

Of course using a bigger consumer will draw more amps from the battery. Thank you. We know that. The debate was not on that but on this misinformation that the absence of a relay is damageable to the battery, a confusion that I clarified. NOT debating whether a relay was needed or not. Just general discussion to straighten up a few things....but maybe I should not waste my time is discussing for the sake of basic technical clarification if some just want discussion for the sake of discussion, without the proper education and understanding!

Then please, guys, go back to your school books, chapter: electricity. A thinner wire (length being equal) HAS more resistance than a bigger one. Then, when "more current is drawn", more power "will be lost in the form of heat"....: yes, but only IF that quantity of "current" (should say "energy", expressed in Joules, kilowatt-hour, electron-volts...what you like: would be better if proper terminology was used) was able to go through. Then, anyway, the generated heat does NOT mean that more energy has been drained than with a bigger wire, at the contrary. It does not mean either than a smaller wire can drain the battery faster, at the contrary (again!).

All your "demonstration", dear Vinit fails, not in the final conclusion that a relay and bigger wire from source to consumer is needed, but in explaining the reasons why (as well as Syed etc... above, when he says: "I think that you mean that a relay is nit (nit?) necessary"...)

That being said: I shall not continue this debate on very basic but misunderstood principles of physics: please take your time, go back to your books, and think instead of jumping on your keyboards. Happy that "Abhijitkn" and "gn.times" appear to be more technically sound.

Nice. Exactly correct response.