How to increase thump in Royal Enfield?

About 80% of Royal Enfield UCE owners have same question in their mind that "How can i increase the thump in my new Royal Enfield UCE?"

 Due to exhaust emissions, pollution norms and taking care of international standards for export models Royal Enfield Developed an engine inspired from International Market – “The Unit Construction Engine” which is a Euro IV compliant engine.

However, as exhaust emissions get tighter by the day, so do the noise limitations. In order to achieve both and do so comfortably, the modern Enfield has an engine of unit construction (engine & gearbox in one unit).

Right from the design itself, it is supposed to provide more refinement (meaning less noise and vibration).

So, to only way to increase the thump in Unit Construction Engine Is the “Short Bottle” free flow silencer which traditionally came with the Standard Bullet since we’re seeing bullet on indian roads.

Short Bottle is a perfect fit for new engines as well as the older ones as it has some kinda relation with “The Bullet”. You can install any silencer on your bull but none can satisfy you as the Short Bottle.

One can also go for Goldstar/Indore Silencer as they are know for there quality built and quality sound.

Short Bottle Silencer

GoldStar Silencer

Long Silencer

Punjab Silencer

Why not Long Silencer or Punjab Dholki..?
Read This : http://goo.gl/U8AJG

Before installing the Short Bottle/Goldstar/Indore Silencer make sure that your bullet has completed few thousand kilometres. After installing a short bottle you’ll obviously need to rejet your BS29/UCAL carburetor if UCE or Mikuni VM-24, VM-28 if CI engine for consistent performance.

Visit the Service Center or Consult a mechanic for rejetting of carburetor.

Enjoy the thump…

Dug, Dug, Dug,Dug…..…

What is the method or How to improve Royal Enfield Thump?

Q: I have royal enfield electra twinspark uce

2010 model

I removed & changed the bend-pipe.

I have installed the free flow silencer but there is no original thump.

Ans: About 80 % of Enfield buyers do so because they are in love with the sound. However as exhaust emissions get tighter by the day, so do the noise limitations. In order to achieve both and do so comfortably, the modern Enfield has an engine of unit construction (engine & gearbox in one unit).

Right from the design itself, it is supposed to provide more refinement (meaning less noise and vibration). So if the engine itself produces less noise, how can you get the old thump just by changing the silencer ?

Source(s) : https://www.facebook.com/notes/royal-enfield-bullet-club/what-is-the-method-to-improve-royal-enfield-thump/226931344022253

Royal Enfield Bullet CLUB

TRUTH ABOUT BIG MUFFLERS/SILENCERS/EXHAUSTS

Royal Enfield guru Pete Snidal recently spotted something about the motorcycles.

"I notice one thing all the Bullets for sale seem to have in common - can you guess what it is?" he wrote.

Pete is the author of the acclaimed Royal Enfield Bullet owner's and workshop manual. He frequently chimes in on the Royal Enfield Yahoo message board to help troubleshoot problems owners experience.

But what could he possibly be seeing in the for-sale ads?

I guessed that maybe the Bullets listed for sale here tend to have low mileage. Obviously, some owners buy them and then sell them without riding very far. I was on the right track, but Snidal had something else in mind. He wrote:

"Look at all their exhaust systems. Something I discovered very early in life with Brit singles is that they became completely different machines with free-flowing (i.e., loud, requiring using your head about where and when to apply large gobs of throttle) exhaust systems. And that they were much less satisfactory when stock.

"An exception was the Velocettes with that monster Brooklands silencer, and the Goldstars, which already came with noisy mufflers. Some AJS/Matchless, too.

"My theory is that the owners who never 'bothered' with the first-stage mods, i.e., inlet and exhaust mods, just fell into the doldrums with their Bullets, and ended up putting them on the market. If you wonder, try putting your stock exhaust back on, and see for yourself.

"Instant Bow-Wow!"

Snidal was seeing the big, bazooka shaped factory muffler, which restricts performance, in the pictures of the bikes. Replacing it with a shorter and nosier silencer (and tuning appropriately) is an easy way to increase performance.

As Snidal observes, that makes for more owner satisfaction.

Big factory silencer affects performance.

credit : david blasco

Back Pressure in Royal Enfield

“Back pressure is the pressure drop in the flow of gases from engine to exhaust. The less power engine has to spend making pressure to push the gases from exhaust output, the more power it can send to the wheels”.


The term back pressure is misleading as the pressure remains and causes flow in the same direction, but the flow is reduced due to resistance. For example, an automotive exhaust muffler with a particularly high number of twists, bends, turns and right angles could be described as having particularly high back pressure.


The exhaust having maximum bends will have the higher back pressure resulting in negative effect on engine efficiency resulting in a decrease of power output that must be compensated by increasing fuel consumption. Less back pressure makes engine able to transfer maximum power to wheels and keeps it less heated up.


The motorcycle's exhaust pipe is connected to the cylinders in the engine. When the engine is operating, it circulates gas throughout the system. The gas expands as it circulates through the engine, then finds its way into the cylinders. Some of the gas is not expelled out of the exhaust pipe, and it then creates exhaust back pressure. All of the gas pressure should leave out of the cylinders and into the exhaust pipe at a constant rate. If the rate is thrown off balance, then you have the result of exhaust back pressure in your motorcycle. Many believe that there is no effect on your engine when motorcycle exhaust back pressure is formed. Either way, it is not normal for exhaust back pressure to occur.


Back pressure caused by the exhaust system of an automotive four-stroke engine has a negative effect on engine efficiency resulting in a decrease of power output that must be compensated by increasing fuel consumption.  

Free Flow silencers has less back pressure than that of stock silencers that is why we bulleteers prefer louder sound but the fact behind it that a free flow silencer helps in less heating up of engine and louder sound as we alwayz want.



Royal Enfield Bullet CLUB