Hi
I own a GS500E 1990 model which i purchased recently,there was a problem with carb ,fuel used to overflow and the fuel mixture was rich
so i removed the carb and cleaned needle,diaphragm and float.....but didn't clean the jets
the overflow of fuel has stopped but new problem has cropped up
1.the acceleration is real poor,the idling is alright but throttle is inconsistent and once on high gear the acceleration is better
2.i can hear clicks from carb when in idling and when i checked the spark plug there was excessive carbon sooth deposit
3.is there a route for throttle cable routing cause when i tun the handle to right side the acceleration seems to pick up on its own.
could you guys please let me know what is the problem with carb and routing of accelerator cable if possible
can excessive engine oil cause poor acceleration in low gear
on the throttle cable issue... you can adjust the cable at both the throttle and the carb end so routing shouldn't be a problem. Just tweak until you get it right.
as for the low acceleration, could be a carb sync problem? maybe wait for someone else to chime in on this, i'm no expert.
Sounds like you've routed your throttle and possibly also your choke cable wrong. They shouldn't be pinched anywhere and should allow you to turn the handlebars from lock to lock without changing engine speed.
Are you sure you aren't having trouble with low power at low RPM? Below about 3,000 RPM, the bike doesn't really make a lot of power. If you're not being generous enough with the throttle, you could just be operating in a region of the power curve that isn't much fun...
Is your idle OK when you rev the bike up and then cut the throttle? It is possible you have a vacuum leak. If the idle hangs when you rev the bike up, you could have a vacuum leak. It is really easy to take the carbs apart and put them back together with a vacuum leak. I've done it myself not that long ago... If the bike doesn't return to idle right away when you cut the throttle, start looking for a vacuum leak.
If your floats were stuck open (sounds like they were) your plugs should be super black. If you changed the plugs or cleaned them after you cleaned the carbs and they're still coming out black, you might be running rich. Double check your float heights with the vinyl tubing method to make sure they aren't set wrong then consider rejetting...
Also, setting the float height and cleaning the diaphragm are both harder than changing jets, so next time you've got the carbs apart, you should consider taking a look at the jets and possibly changing them...
thanks Fred
the plugs were super black almost charred,and some time it doesn't come back to idling immediately
first time working on carb,so which component of carb should i be looking for vacuum leak
The easiest way to find a vacuum leak is to spray something flammable onto the carbs and intake boots while the bike is idling. When you spray the leak, the idle will change and you'll have found your leak. I recommend starter fluid, which is super crazy flammable, but some people don't think it is such a good idea and use things like carb cleaner or WD-40 instead.
If I had to make a random guess for the vacuum leak, I'd say either the intake boots are cracked or you forgot/never had one of the o-rings under the carb tops. My project bike had both of these problems and from what I read here, they are fairly common...
I had noticed a crak on one of the intake manifold but thought it may be superficial and i couldn't get the carb to fit back snugly into the airbox.whats the procedure to fit back carb into airbox and into the intake manifold.The airfilter also had few folds would that be also cause for the problem.
Intake manifold needs lubrication ... In some cases I smear with the gasket maker and put em on before that dries too much, seals and lubes.
Air box, remove the air filter, stick your hand into the carb mouth and spread the boot around it. It will never go on otherwise.
Cool.
Buddha.
Buddha
I followed the procedure mentioned by you and was able to mount back carb boots onto the airbox correctly and the clamp that goes round the intake boot ( from carb to engine) was loose and was cause for the problem,I had apparently not tightened it enough , now the idling has got better and engine doesn't run rough anymore but still the acceleration in low speed is very poor.The engine takes sometime to respond to the throttle it takes like a sec delay to respond to throttle, occasionally click sound can be heard from the carb .what is wrong with the carb.
There is also grinding noise from engine when it is cold,it tends to disappears after engine warms up.I understand that there is some lateral movement of cam shaft in gs 500 and it is generally causes this noise or is it for any other reason.