K & N air filter advice.

[wullie3xv9]

Hi all. I've just purchased the appropriate K&N air filter kit (SU-7592) for my GK76a's stock airbox assembley & would like to clarify what size main jets, needle clip position & pilot jets are required if I fit the larger of the two air inlet rubbers supplied. I'm assuming that no jetting / setting changes are required if I fit the smaller, stock sized inlet rubber supplied. (My bike has a Scorpion end can fitted to stock downpipes).
I've removed the carbs to check them over / clean them out, (they've already been treated to a set of Viton O-rings by its previous owner), so would like to know jets & settings before I rebuild & re-fit them. Thanks in advance.

P.S. I've trawled through all previous posts relating to K&N filters but couldn't find a definitive answer.

[rgvsp]

I'd stick with the stock settings and then adjust if necessary. I have the larger air filter and kit exhaust and went with a larger main, adjusted clip richer and ended right back at the stock carb settings.

[morris147]

Get it set up on a dyno if you want it spot on....

[wullie3xv9]

Thanks for the replies, guys. No definitive answer then? I've removed the engine from the frame now so that I can give both of them a good clean up / check over & will check the valve clearences on the engine while it's out.
I'm now seriousley considering buying & fitting the less restrictive stainless steel down-pipes from Sandy Bike Spares via Ebay.

So, does anyone on here, with a non SP model GK76a, have a K&N filter with the LARGE inlet rubber fitted & a Scorpion end-can fitted to the above down-pipes?? If so, could they advise me please what size mainjets, needle clip position & pilot jet size to start with. Would 112.5 or 115 mains, needle clip moved from the middle slot to the 2nd from top slot & stock 47.5 pilot jets be a good place to start & then fine tune from there ??

Cheers.

Wullie.

[stripes1976]

ok 117.5 is a good place to start with the main jet on the dyno but always start rich and come down. I have always tried the 120 main as a base then usually drop to 117.5
For every 3 main jet sizes you increase you will need to go up 1 in pilot. If you dont you have a huge flat spot and bad running in the middle and low down.

[wullie3xv9]

Thanks for the info above, Mr Stripes. Can you confirm please that this is the jetting/settings to try with a set of free flowing stainless down pipes/headers, an old, round Skorpion end-can & K&N filter with large inlet rubber fitted. TIA.