20 Most Recent 1979 Honda CX 500 A Questions & Answers

The original exhaust was a fairly complex and expensive system that was a twin exhaust with an underslung balance box connecting the two. Because an OE replacement was so expensive an aftermarket exhaust was the usual replacement which usually resulted in some loss of midrange power, however quality replacements or cheaper units usually didn't affect peak rpm or significantly alter the air/fuel mixture. If the cause doesn't seem to be excessive exhaust back pressure perhaps it is fuel starvation due to dirty filter or carbs. Water is more likely than dirt but I suggest a thorough clean.

Hi,if you have standard exurst you may have to take one of the silencers out so to get the spindle out once undone,take locking pin out undo locking nut,take washer off,then push spindle out and pull wheele off, this maybe called a pig but are verry well designed so are verry easy to work on,one of the best courier bikes I ever worked with. hope this was some help.

easy it's the stator.

sounds like you have a broken piston ring

http://cx500forum.com/forum/technical-help-forum/14434-ignition-switch-wiring.html

the air flow is change,and changes many other things too. see also airfilters are clean,good oil frech.hows compretion from cilinder how are the sparkplugs,whits color do they have.tires are good not to low.try to restore to the original.always the best.you can never get any car or bike better then factory.there are many books to find.maybe this one has rpm security contact.

its posseble the anker ( gear ) off the starter dont come out,and dont grip flywheel.

Sounds like the slow idle jet. I had this problem with my cx500c. You will need to take the carbs apart and really give em a good cleaning.
http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=19&t=199

probly need a new fawcett-they certainly didnt test drive it--try to stop up that other outlet with something-like jd weld etc--get a clymer book for troublshoot procedures on total bike

You have got a load of bad fuel, either dirt or water. Check the contents of your fuel tank and clean it out. Remove the fuel tap and clean the filter. You will also have to clean out the carbs.

Float needle worn or sticking

hi, had many a good time on a cx 500, realy easy to ride with or without a pilion, for the rite money they are a good bike,

as the bike is now 32 years old be careful you can still get parts for it, in the early days the bike did have some issues these included

crankshaft bearing failure,, engine removal required
camshaft failure engine removal required
timeing chain and tensioner guide failure, engine removal rear cover removal
waterpump seal failure, can be repaired in frame
mechanical cooling fan failure, repaired in frame
alternator failure, engine removal,

the engine itself is overhead valve as this incorperates a cam chain and the camshaft is below the cylinder head in the middle of the engine, it uses pushrods to open and close the valves, these may become rattely after high milage but there is no cause for concern,
a noise from the front of the engine may well be the cooling fan, when faulty they make a hovering sound,, the center is alloy inside of a plastic fan, this becomes loose.so look out also for radiator damage,
on the odd ocasion it was reported to have gearbox problems, ride the bike check for smooth gearchanges, with no noise throughout any gear, ride the bike slow as well as higher speeds and get a good feel for the ride, as the cooling fan is mechanical you can alow the bike to idle without the posibility of overheating, so do this and check all is well before you comit to buying, it is normal to feel a slight tilt in the bike as you blip the throttle from tickover, as the fan is mechaical combined with thev twin engine, hope this helps you paul

workshop manual availible if required

Usually the resister spark plugcap (long hard thing ) that joins the lead to spark plug swap with each other to check

You can damage electrical components if you do not run the correct voltage battery. If your battery is below 12 volts replace it. If you take off the seat you can easily test the stator with a volt meter. Find the stator plug with three yellow wires. You should have continuity between any combination of the yellow wires. You should have no continuity between any of the yellow wires and ground. That is the test of a good stator. If your bike is still losing charge after those checks , you are probably looking at a new regulator/rectifier.

Sounds like the low speed circuit in the carb is pluged up with some trash (dried gas). You need to take apart carbs and clean all jets and passages.Small jet is the pilot jet. Hope this helps
D.

Remove the crankshaft hole cap on the front cover and the timing inspection hole cap from the rear cover. remove the spark plug caps and valve covers. Put 17mm socket into the front of the motor and rotate the crankshaft counter clockwise and align the "TL" mark on the rotor with the pulsar index mark(little arrow bump).The left cylinder must be at top dead center of the compression stroke(both intake and exhaust valve rockers are loose).Now adjust the valve clearances of the left cylinder. IN: 0.08 mm (0.003 in)
EX: 0.10 mm (0.004 in)
Adjust so there is a slight drag on the feeler gauge. Do not set too tight, oil pressure in the rocker bearings will zero tolerance the valves. Set the valves too tight and you damage the rocker bearings. The motor is now in the correct position to adjust the cam chain tensioner. Loosen the cam chain tensioner lock bolt located right above the rear cover timing inspection hole. When the bolt is loosened the cam chain tensioner will automatically position itself to provide the correct tension. Retighten the tensioner lock bolt. Next turn the engine and align the "TR" mark on the motor so the right cylinder is at top dead center of the compression stroke and adjust the valves.