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A Weapon to Throttle: SFR bike (Performance Functional Mods)-Part II

While the first part was all about cosmetic functional mods, today we are here to learn something a km further. The mods in the last article were only add-ons to the bike which aided the rider while he performs, as a prop to support his stance and make him safe at various points of time. Those modifications did not have any significant effect
on the bike’s performance.

Today though it is going be a riot of a ride for every modification listed down here. All of these aren’t mandatory but most of the mods are inclined to make the bikes much torquey than powerful. The consensus of each is explained below in detail:

A Weapon to Throttle: SFR bike (Performance Functional Mods)-Part II

1. Aftermarket Spark Plug: There are tonnes of options on the market from various companies such as NGK, Champion and such which are known for aftermarket spark plugs. Replacing the stock with iridium, platinum or other relevant ones helps achieve a better combustion hence more torque and power over the stock. A better compression ratio also is achieved. This modification is pretty basic and economic, just that one has to understand the exact series compatible with the host bike which can be worked out with the retailer or an experienced mechanic.


2. Aftermarket Exhaust (option): This option is often installed with four objectives. Firstly, these exhausts can help increase power against the stock exhaust. Secondly, most aftermarket exhausts are lighter in weight over the stock. This helps reduce the overall kerb weight. Third being, better heat insulation on the outside which aids the rider’s safety during an impact. It reduces the chance of a burn in case of a mishap from at least the exhaust during an attempt of performing a trick. Lastly, such exhausts are generally loud and this is a sport where you want to be heard.

Browse Akrapovic, Arrow, Two Brothers and other such companies for compatible exhausts. Such exhausts are generally 1/10th in weight to the stock exhausts. That is an overhaul to the stock power-to-weight ratio in a literal sense. There are generally two kinds of exhausts: slip ons and welded ones. Prefer not to break the 80 dB government norm. Still, a bit of flair won’t really hurt anyone!

3. Free flow exhaust (option): Some riders prefer to completely get rid of the exhausts and opt for a free flow. It’s, of course, the easiest way to shed weight and make some noise. Decibel (dB) killer and catalytic converter are housed in the exhaust pipe for certain bikes which need to be removed to achieve the desired free flow. Keeping your bikes off public roads is the best option then as using a bike without an exhaust, dB killer and catalytic converter can attract the local police. Of course, the tree hugging community will envy one until they see them popping an awesome trick.

4. Handbrake Setup/Kit: This is an aftermarket arrangement which involves a master cylinder, a custom lever, brake line and rear brake caliper. This is connected to the rear wheel and the setup is concealed properly inside the body of the bike. The handbrake is mounted below the clutch lever on the right-hand side on the handlebar. The brake caliper is adjusted onto the rear disc. Handbrakes are an integral part of every trick the SF rider performs be it wheelies, stoppies, acrobatic tricks and others.

5. Custom Sprocket Chainset: The custom sprocket and chain set is machined for bikes and is housed onto the rear swing arm. The main objective of the same is to get more torque with uniform speed on lower gears or rev band which makes the ride seamless. Sprocket designing is a very tedious and tricky task. The right amount of teeth is important for maintaining a proper gear ratio. In some cases, even the sprocket on the output shaft on the engine side has to be redesigned. A local lathe operator might be of considerable help regarding the same provided one knows how many teeth are actually needed.

6. Performance Air Filter: The stock air filters have a fixed air mass flow which leads to a certain compression ratio being developed in the engine. Increasing the mass air flow i.e. increasing more amount of oxygen to let the fuel burn will help better combustion and hence better compression ratio. This roughly translates to a better response on the flick of a throttle. Companies such as BMC Air Filters, K& N air filters and such others might help one if replacement air filter for the host motorcycle is available. Though this would require more than conventional maintenance.

7. Strip down: This modification is listed here and not in the earlier article in spite of it looking more like a cosmetic change is because this mod has a significant effect on performance. The headlights, tail lamps, side panels and rear panels are some of the parts which are stripped down to reduce weight. Since the bike might topple a lot during practice sessions hence removing the panels is a good idea as it will also then help one from controlling the cost of damages. The stripping doesn’t really limit to these ones listed but depends on the specific bike.

These modifications or alterations should be conducted by experienced mechanics only. Fine tuning relevant bits helps achieve a seamless experience during a performance which translates into a spectacular sight for the audience. Bike maintenance is a bit more involved with all these modifications. Some modifications are bike dependent and cannot be listed out here, for example, some bikes might experience a coolant leak during a wheelie due to the stock design of the coolant inlet and improper sealing. Honestly speaking there is no limit to performance modifications.

Coming down to the statutory of always wearing helmets, no illegal modifications and practicing this sport in permitted and isolated spaces and not on public roads is routine but mandatory. There is a difference between hooliganism and a skilled performance. Respect the road and people will always respect you back. Fuel for thought!

— Gaganbir Singh

Disclaimer: This article was prepared or accomplished by it's author in their personal capacity. The opinions expressed in this article are the author's own and do not reflect the view of Motorbikes India or it's owners.

The views and opinions expressed on this web site are soley those of the original authors and other contributors. These views and opinions do not necessarily represent those of Steve Gerweck, the GERWECK.NET staff, and/or any/all contributors to this site.

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