different jet sizes in fzr

dangerousdave · Post by **dangerousdave** » Mon Mar 21, 2016 10:40 pm

Ok chaps does anyone know why the two inner carb jet sizes are 122.5 and the two outer ones are 125s,?

Post by **nuggitt** » Mon Mar 21, 2016 10:45 pm

It's to do with the heat build up in the two inner cylinders Dave. It's fine so don't worry.

dangerousdave · Post by **dangerousdave** » Tue Mar 22, 2016 9:26 am

banner001 · Post by **banner001** » Tue Mar 22, 2016 9:51 am

hotter cylinder means less dense air, so you need less fuel hence the smaller jet, some manufacturers tried putting larger jets in the middle to draw heat from the cylinders through evaporating more fuel...does even out the heat to some degree but messes with the fuelling and feel of the engine.