First we tune the LSN . Yes FIRST ! Rev the engine on the box, let it settle then pinch the fuel tube with your brakes on so the carb is closed. Count how long it takes to rev up and die. Ideally it should rev up only slightly then die , the rev up should take about 3 to 4 seconds. Note this will shorten when the engine gets hotter. If the engine revs up high with the pinch then lower the idle to suit. Then re do the pinch test. Once this is set we go onto the HSN



Now tune your HSN till you get clean power through the rev range and a trail of smoke. Remember “ No Smoke No good “ . Ok once you have achieved this fill the tank again and run it all the way to empty. You should have an even power from pretty much start to finish . if your engine sags in power at half way , richen 2/8 on the HSN then repeat till you get a consistant running of the engine all the way to the bottom of the tank. What you will have is a needle adjustment that accepts an average tank pressure. Remember an engine only reaches max temp when it gets to the end of the 3rd tank. So if you typically run for more than 20 mins make sure you keep an eye on the tuning. Once you hit the 15 min mark you may need to richen

this is what is said on massive mods