Big bore baby!!

For those of you who don't actually know what a big bore kit is, basically it is a kit which replaces your original engine sleeves with bigger ones, which effectively means that you can have bigger pistons!! I think you can you change the stroke on the pistons by having shorter conrods which obviously means your bike suddenly likes to rev a lot higher!

In theory I suppose it should work as rally cars etc do it to get more performance, although I don't know anyone who has actually done it. I used to work a lot with 2 stroke engines, and so enjoy working with them, taking them to bits and stuff :) although 4 stokes are more tricky, so i would recommend some expert advice before you take it on your self to do some serious modifications.

Here is a typical picture of a big bore kit

As you can see it includes, your sleeves, pistons, gudgeon pins, piston rings etc. I've never actually fitted pistons to a 4 stroke, only a 2 stroke, is there much of a difference in difficulty? obviously there is the timing mater involved, otherwise you bike will go poof! you know, valves opening when they should be closing, so you pistons slam into your head kind of thing. Not a pretty site to think off

You can purchase these at http://www.tts-performance.co.uk they have an extensive range on these, on many models of bikes.

The only problem I can see from this is that once you start messing around with the pistons etc, you bike is going to burn more fuel, and there for get hotter, and with the current set up on your bike, you will more than likely start burning holes through your pistons! i.e you bike is to lean. Where ever or not you need new carbs and air filter set up is a question i suppose you would have to put forward to the company.