Ok i've got a question. I just noticed the lsn on the 3 port engine i have is a short needle (it does not stay in the throttle body when opened) and the previous owner had the lsn completely tight. It seemed to run just fine but i decided to richen it up abit and it still runs fine, in fact it doesn't appear to have changed anything or very little even with 1 1/2 - 2 full turns out from where it was. It creates smoke but only when past half throttle. Also richening the lsn doesn't seem to have any effect on the idle. Is this normal? I didn't have much of a chance to play around with it this morning i only ran about 1 tank through it. But it seems to have plenty of horsepower and runs very well. I'm just worried about long term damage as i'd like to be able to use this engine for at least a year or 2. Any help is greatly appreciated. Also a link to a guide or post where there is instruction on tuning the short needle carb would be great, unless of course its the same as tuning any other short needle carb. Thanks