Right, I asked the question of identifying jets in my carbs in another thread so I thought best to start another one regarding changes.

Anywho, its a bandit 1200 mk2 model with 30k on the clock. Bike was running lumpy and had a bad flat spot between 3 and 4k. Bike had a slip on can and a K&N filter.

I took the can off and filter out and replaced both with standard.

Took carbs off and cleaned them ( wee bit dirty, explains the lumpyness but not the flat spot)
Checked all the settings, float height, neddle notch, diaphram etc all good.

The jets however had me confused. Standard jets are 15, 60, 100

the jets that were in there were 15, 60 and an odd main jet. the pilot and mid jet are the original mikuni as the have the markings on them but the main jet had just 98 marked on it, no mikuni marking.

This led me to believe than the main jet was changed to try and suit the k&n and can.

A quick cross reference shows a dynojet 98 jet is the equivalent to a 92.5 mikuni which could explain the flat spot and the bike running lean.

The needles are set to 3rd notch down which is standard.

So…. would going another notch down on the needles enrich the main jet to compensate and an extra tweak on the pilot screw work out for the better and solve my flat spot conundrum.

and no i’m not getting new jets, i want to solve it with what I have.