11/3/2022 0 Comments 79 yamaha xs650 carburetor diagram![]() ![]() #7 - Tighten up handlebar mounts and/or install new ones. You may have springs but no longer any dampening. #5 - Check to see if your rear shocks still dampen. Many bikes are still running with the original oil ( or none ). #2 - Replace the original Steering head bearings with Tappered Roller bearings. #1 - Replace the factory plastic swing arm Bushings with Bronze bushings. (these start out at 5K Ohms & resistance rises with age).ġ2. Low voltage - System Not charging, Voltage drop in ignition switch or harness.ģ. 79 YAMAHA XS650 CARBURETOR DIAGRAM CRACKCheck the fuse panel used on 78-84 models as the fuse holders crack from old age.ġ1. My bike loses electrical power without notice. The power supply to the charging system comes from the battery and the ignition system requires a power supply.ġ0. No, the XS has a non permananent magnet type alternator rotor which means the charging system requires a power supply to make power. Alternator Rotor, Rectifier, Regulator and then the Stator are the next possibilities.ĩ. Check connections & couplers for contact & corrosion, Check alternator brush length (should not be less than 1/4â€). If charging system is not working what should I check ?Ī. A fully charged battery will read about 13.5 Volts. System should read 14.5 to 14.8 volts 2,000 RPM. ![]() Use a volt meter and see what the battery charge is at 2000 RPM. How do I see if the battery is receiving a charge ?Ī. The gear is located behind the front edge of the clutch and a kit with the necessary parts needed is available.ħ. The starter bendix gear that engages with the one on the crankshaft to is worn out & will have to be replaced. My electric start makes rattling noises & fails to start the engine. Check cable condition and that they are properly routed.Ħ. Check for carb holder air leaks or restrictions in the carb jets or fuel supply. If the idle is high or is slow to drop (hovers) then the system is receiving a lean fuel mixture. Why does my Idle not come down quickly when I close the throttle ?Ī. Check for loose clamps, holes or cracks in headpipes or mufflers or defective gaskets.ĥ. Air entering the exhaust hits the hot lean mixture in the muffler and ignites it. An air leak in the exhaust system is the cause of backfires when you roll off the throttle. What causes my bike to backfire on decelleration ?Ī. Repair or replace these leaking petcocks.Ĥ. The Vacuum operated fuel taps often will not shut off properly (most 78-84’s) and this contributes to the problem. Note: on 80-84 models the fuel may also leak past the O-ring on the outside of the push in type float valve seat. Worn out, dirty or misadjusted float Valve ( carb float needle & seat ) OR defective or misadjusted carb floats OR bad fuel ( dirty or gummy ). Why do my carbs flood when the bike is left standing ?Ī. Make sure petcocks flow & that there is no air leaks.ģ. The 70-79 Stock CV carbs are very superior to the later types. Needle Jets need to be clean and there should be no air leaks or obstructions to flow of good clean, new fuel.ġ970-79 Carbs usually need (about) a #140-145 main jet, up a size on the pilot jet,Carbs in Sync & pilot mixture screws adjusted. These carbs have a definite limit on fuel delivery and it seems that the more open the exhaust is the harder it gets to tune these carbs. Check that fuel flow from petcock is good, No backup of sediment at float valve screen (stock). Our Vague best guess is - 1980-84 models with stock 34mm CV carbs (North America) usually seem to require (about) a Main jet 142.5 - 147.5, Pilot Jet of #45, Air Jet of # 127.5, Idle mixture screws set at 2.5- 3 turns out, carbs in sync, fuel level shut-off in float bowl set high. Spark plugs should show a light tan color on the insulator. Every bike varies and a lot of factors effect this so a plug read & testing is the only real way to answer this (Altitude, ignition, engine compression & other factors effect tune). I am changing to aftermarket exhaust and/or air filters what jets do I need ?Ī. CV carbs fitted in North America are a particular problem as they were jetted Very lean, these lack some of the tuneable components found on the stock 1970-79 VM38 CVcarbs.Ģ. 1980-84 models with emmissions type 34mm. Absolutely! All aftermarket filters or exhaust flow more air & your system will require more fuel to go with that air. If I change my exhaust or Air filters to a type different than original will I need to rejet my carburettors ?Ī. XS650 Tech Info - 20 Frequently Asked Questions :ġ. Please check back regularly.Ĭlick Here for Step by Step Engine Overhaul Instructions This section is currently under consruction. ![]()
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