Can i?

[Jack2004]

Rejet my bike myself, i know you can just buy a larger jet, but if i use a very small drill piece can i do it myself?

Will this cause any problems if i do?

Thanks Jack

[stinkwheel]

NO!

Not unless you are a qualified engineer and have precision machining tools. You can get jet drills but it is a specialist job (ie, if you can do it, you would already know you can). Even the facing on a carb jet is critical. You can knacker one by just poking a piece of wire through it.

Just get new ones, they are not expensive and you can keep track of which size you are using.

But before you do that, do you know what you are doing? Do you know how to tell that you have the correct jetting?

It is just that the fact you are asking that question suggests that you don't have a great deal of knowledge on the subject. Do not undertake fiddling with your carburettion lightly unless you understand exactly what effect everything you fiddle with is likley to have in relation to everything else. Perhaps a case of LITE (leave it to experts) or at a minimum, some in-depth reading up on the subject?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Jack2004]

I think i will get a new one then, thing is though i don't really know what i am asking for, do jets come in different sizes? I know they can have a different jet size i.e. 100, 95 etc but are the actual jets all the same in all bike?

Could i just go into a bike shop and say for example i want a 85main jet?

Also is there anywhere online where i can get one?

[stinkwheel]

What sort of bike is it for and what are you trying to do (why do you want different sized jets)?

Most japanese bikes are fitted with either Kehins or Mikuni carburettors and on the whole if you ask for a, say, size 60 jet for a kehins carburettor, it should fit but there are variations, better to give the model too.

Bikes have either two or three different sized jets in the (each) carb that can be changed. The sizes are sometimes even different between years for the same model.

*If you fit the wrong carb jets and run the engine for any length of time, you can permanently damage your bike*

Fitting a larger main jet does not necessarily make your bike go faster, in may cases it can make it go more slowly. The jet size needs to be carefully matched to suit the airflow through the filter, the diameter of the carburettor, the displacement of the engine and the degree of back pressure from the exhaust in conjunction with the position and shape of the throttle needle and the degree of cutaway on the throttle body. (all carefully worked out by cunning little japanese guys)

If you have no idea what I am going on about, don't fiddle with your carb jetting.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Jack2004]

Thank you, this has been very helpfull.

[Jack2004]

Right i've found what i need i think, its called a
'main jet Mikuni POWERJET'

Does this sound right? I just wasn't sure because of the POWERJET.

[stinkwheel]