Front sprocket
 

Hi ive recently bought a new did chain n sprok kit to fit to my f4
My mate said about geting a reduced teeth front sprocket and will get more pull is this true and what size would be best tooth wise for my f4 ??cheers

-1 is all you want to go. -1/+2 is a common sprocket setup.

Ok cool i see so -1 will give me better power/performance???

It won't give you more power. Powerplant changes do that. With driveline changes, its give and take. You will gain some acceleration off the line, but lose top end speed. I am not a huge fan of just changing one component of the driveline, especially if it is older and needing replaced. Save/spend the extra $$$'s and get a new chain and rear sprocket while your down there. Keep in mind going JUST -1 in the front will mean you will have to compensate for the slack with your chain tension adjustment. Going -1/+2 'evens' it out a bit.