emco stock replacement

There are two elements you can tune for best performance- fuel delivery and airflow.  If you've taken the airbox out, try experimenting with some tubing between the filter and carb.  It'll help the carb develop more vacuum which will pull more fuel up through the pilot jet at lower rpms.  This should richen the mix to get rid of the backfire and give you noticeably more low end response and power to match your midrange gains.  Right now you are trying to compensate for the insufficient vacuum at low rpm by adjusting the mixture screw.  When I did my tube my mixture screw went back in until it was only 1/4 to 1/2 turn out for best overall performance.  One full turn out and idle would start to drop and 1.5 turns out the engine would start to stumble.  The tube really woke my bike up .  The LS650 is well known for it's torque. With the tube you are basically recreating the stock air path setup that gives the bike it's famous low end torque.  Then you have the benefit of a freer flowing pod filter sitting in the open air for midrange and high rpm.  Just about any tube will help.  Tuning the tube though will maximize the performance.  Combined with your SE muffler it will give you lots of grins!

In the pic below, what do the parts numbered 31, 32 and 33 do?

dasch wrote on 03/29/09 at 00:12:31:


Aha. Thanks.