Tips,Tuning,the,Carburetor,Set car Tips to Tuning the Carburetor (2)
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Settingup your carbsA general rule about setting up carbs is to expect your fuel consumption to rise proportional to newly-found horsepower. When setting up your carb, the bestapproach is to set it up on the rich side, then lean it back until you get quick throttle response. Tuning too lean is dangerous, because if can burn out your engine.Idle adjustmentshould not be a problem on your Harleys carb. If idle isnt smooth and steady,look for a vacuum leak in the intake manifold/cylinder head seal area. An oldmechanics trick to check for such a leak is to use a spray can of carb cleanerand a straw. With the engine idling, direct the spray strongly around eachclamp. If the engine RPM changes suddenly, youve found the problem. Vacuumleaks at manifold joints are common and should be checked for frequently.Anothercommon problem is spitting back through the carburetor. This indicates thatthe mixture is too lean.Blacksmoke out the exhaust indicates a too-rich mixture. Checkingyour plugsYoucan get an idea of your carbs mid-range mixture quality by checking spark plugcolor.Hereshow to do a reliable spark plug test: Grab some heavy gloves, an extra pair ofplugs and a plug wrench, and head out to a flat, empty stretch of highway.Maintain 60 70 mph for at least fivemiles. Shut off the engine at cruising speed and pull in somewhere safe. Beforethe engine cools, pull your plugs and have a close look at them in good light. Observethe round, flat surface perpendicular to the threads. This area should bemid-brown/gray. Black indicates youre running too rich in the mid range, whitemeans too lean.Takeinto consideration your altitude (higher means a richer-running engine),barometric pressure, air temperature and the conditions under which younormally ride. Its best to tune in the same conditions, and preferably on awarm, clear day when the barometer is high. Someother carb adjusting tipsOilconsumption can have an effect on your plug color.Themain jet is easy to adjust, but requires more speed. You can get a feel for themain jet in lower gears, but the ultimate test is flat out.Andagain, plug color is the final indication of mixture.Thereare quicker ways to get you to the ballpark. When your motor is revving over4000, is it heavy-feeling, sluggish, and unwilling to pull strongly? Thisprobably means the mixture is too rich. Revup to redline, then back off the throttle slightly. If the motor wants to runfaster with the throttle backed off, the mixture is probably too lean.Asalways, check your plug color its the most reliable indicator of carb tune. Find out more about Daewoo carburetor by visit miparts.com.
Tips,Tuning,the,Carburetor,Set