Tuesday, October 13, 2009

High Performance Mods


As we know Indian market is fast growing market in two wheeler segment due to large amount of interest in biking. But lack of imported bikes people are interested in change in their present motorcycles. Generally people tends to change the machine from stock to high performance for either street racing, circuit racing, drag racing or for dirt purpose. Earlier some of the high performance material was not available in India due to lack of knowledge about material or because of importing it to India.

Nowadays in India there are some high performance spares available by some of the direct distributor or importers, for example K&N filters, Piper Cross, MSD Ignitions, NGK, DYNOJET, Microns, and TwoBrothers etc. The material is extremely high performance but just by putting few spares you can’t increase the performance due to lack of information. The performance is depending on channels or the way you put those spares in-line. In simple language it’s a kind of computer flow chart.

In the market some people just trying to do business for money. Anyways let’s talk about the high performance for Indian motorcycle. Let’s start from Filter, in the market you get K&N or PiperCross, LM filters or BMC filters or whatever. When rider or mechanic installs those High Free Flow Filters they generally forget or don’t change some or the other things just to avoid complications.

High Free Flow Filters means Air without any obstruction or rather than increase in Air quantity. Stock Motorcycle comes with some particular ratio of Air and Fuel. For example if the stock has got 5:1 ratio that means 5% is air and 1% is fuel. Now consider Air with Free flow filter is 10%, people always forget to increase the fuel ratio, which means fuel should be 2%. So when you are putting High Free Flow filters don’t forget to increase the ratio of Fuel by Re-Jetting.

High or low number jets are available in the market or you can get it from some local manufacturer with accurate required numbers. Dellorto/Spaco has got jets but not suitable for Mikuni or Keihin because of thread size. In Two wheeler all Indian bikes are coming with Mikuni or Keihin carbs. So make sure about thread sizes. So after Re-Jetting next step is burning all the fuel, which means change in spark plug (NGK-Ir), change in spark plug cable (MSD Ignition Cables), High performance Ignition coil for better and high voltage for burning the fuel.

Next step after plug and its cable the main and priority change in Exhaust canister, which people always forget or ignore or avoid using High Performance Free Flow exhaust canister. The reason behind free flow high performance canister is, when the intake is increased by some amount the exhaust should also go in that ratio which stock silencers can’t do. For that reason its priority to change the canister from stock to high performance (TwoBrothers, Microns, etc). In all mods the channel of modifications should be in route for good performance. So this is the main flow chart for modifications in Indian Motorcycles without tinkering much and very much easy because of external changes. For ECU controlled or EFI system and Carburetor motorcycles some of the modifications are common, But EFI needs some different modification due to its ECU, which we need to remap for high performance.

Don’t forget to work on Lubrication for better performance. In the market you might get some high performance lubes like synthetic, semi synthetic oils. Oil is the main factor in the engine for performance, wrong oil grade can decrease the performance rapidly and might damage the motor or moving parts.

Please note: Some of the imported oils are not suitable for Indian Motorcycles, they are very good for Higher CC engines. The major lag of power starts from clutch, so wrong oil can start slippage in clutch. So make sure before you buy and pour in the motor. Now lets move on to internal changes which I call COREPOWER.

The first change should be clutch springs, the main engine power transmission is through clutch so bad clutch springs or low tension springs kills the BHP, so use proper tension or some high tension clutch springs which should high tension than stock springs. The second step is nitriding of intake and exhaust valves and so the cam, which will reduce the wear and tear. Somehow if you are able to get titanium connecting rod, Valves then nothing like it, but sadly for Indian motorcycle it is still not available.

Anyway, so the next step in internal change which is Big Bore Cylinder. Change to higher size piston for big bore cylinder. After that next change should be Hard Chrome Plating on cylinder bore, which helps the piston for fast motion. The next step is increase in intake bore for better intake. After those changes you will definitely get high performance from your Indian Motorcycle.

Ride Safely And Enjoy Life

Regards,
Chinmay Dangre
You can login to www.bikeadvice.in for my all other old articles.