To Check the float level you only need a piece of clear tube that fits over the carb drain outlets.Then open the drain tap with a screwdriver. Get the bike perfectly upright and test all carbs one at a time. Start the engine to see if the levels move around. Attached pipe like such... Dimensions are for 2KR carbs... This pic is 3LN carbs with the levels marked on the carbs And some info from another post I found on the 3LN models - <!-- m --><a class="postlink" href="http://fzr250.com/viewtopic.php?f=20&t=1487">http://fzr250.com/viewtopic.php?f=20&t=1487</a><!-- m --> and I will quote the relevant line, Hope that helps. Read the fzr 400 manual on this website, <!-- m --><a class="postlink" href="http://fzr250.com/viewtopic.php?t=327">http://fzr250.com/viewtopic.php?t=327</a><!-- m --> chapter 6 page 11 - it tells you how to set the float level.
