hey ive been having a few probs with my bike dropping down to one cylinder but the tanks full whats up with that any one know how i can disconect the feature like i know how far my bike goes with fuel so im not worried bout running out type thing and ideas

cheers

running on one cylinder is definitely not a gas-conservation "feature".  something's wrong

i'd check your spark plugs.  and i'm sure someone will come along shortly and tell you to look at the carbs.

ok prob should of said whats been done and such lol i just put new plugs in today had the carby cleaned and such during the week i know its the left cyl thats dropping out its not the fuel tryed and drained a few types no luck the prob comes and goes like ill be riding along and bam 1 cyl next min its on 2 cyl and jsut back and forth all day 1 to 2 cyl whats up with that

Quote from: snap-onhey ive been having a few probs with my bike dropping down to one cylinder but the tanks full whats up with that any one know how i can disconect the feature like i know how far my bike goes with fuel so im not worried bout running out type thing and ideas

I am not sure where your sentence ends or began   but anyway...

You will have to give us better information to help you diagnose this problem.

Things to check (fuel system) - Rust or debris in the tank, loose hose connections, - (electrical system) connection from the signal generator to the ignitor, connections on the battery, connections from the battery to the chassis, connections from the ignitor to the coils and the coils to the spark plugs.

Are the spark plugs in tight? Do you hear mechanical clunking sounds when this happens? Does the exhaust change color? Does any of this make sense?

Edit: You beat me to the "Submit" button. How do you know it is only firing one cylinder? What prompted you to start working with the carbs? What year is your bike?

The auxilliary ground from battery seems to cause this, and I have had 2 different bikes drop different cylinders ... so no real idea whihc cyl will go when that connection is bad.
Cool.
Srinath.

Quote from: seshadri_srinathThe auxilliary ground from battery seems to cause this, and I have had 2 different bikes drop different cylinders ... so no real idea whihc cyl will go when that connection is bad.
Cool.
Srinath.

Hi, I am having the same problem and it is the left cylinder as well. It seems to happen in when the air is damp or when it is raining, when I get home I connect a spare spark plug and find right side is sparking but not the left. I swopped the coils and leads from one side of the bike th the other and still find the problem is with the left side.

So what is the auxilliary ground and why does it only affect one cylinder? :dunno:

By the way cool site I use the uk site www.gs500e.co.uk but I saw this post so maybe one of you guys has a solution.

OK the additional ground wire ... look at the negative of your battery, one is the big fat wire and the other is the thinner wire ... and in 2-3 inches it will have a connector and will run into the main wiring loom ... that having bad connection will kill 1 cyl. Now in rain or somehting ... never see that happen in mine ... not to say it doesn't ... but I not seen it. Now you might also want to check the crank trigger plate and advancer ... one of those may be dying ... but that usually fails when hot, and is good when cold.
Cool.
Srinath.

Quote from: ukchickenloverSo what is the auxilliary ground and why does it only affect one cylinder?

I searched on "auxilliary ground cylinder" (hint, hint) and found Srinath's post : http://www.gstwins.com/forum/viewtopic.php?p=144024#144024

I'm not sure that "auxilliary ground" is officially the name.  I think that the big fat ground cable runs from the battery to the engine block (and to just about every other ground on the bike: starter, headlight, taillights, ignition control, etc.), and the smaller one runs to the ground terminal on the regulator/rectifier.  In that case, it might be called the "R/R to battery ground" or something like that.

The run-on sentence modulator is probably shorted out.
Seriously, sounds like something electrical which is making an intermittant connection....  Get a manual and run through ignition system diagnosis.

ok my bike in a GS500 03model its got 26 500km on the clock i bought it about 3 weeks ago and its been just droppping on and off with the cyl ive sent it to the bike shop 4 times now becuase ive got warrenty on it and each time they tell me yep yep when dont this and that and the bikes running fine and i normly pick it up jsut befor 5pm i go for a ride 20mins later the one cyl starts cutting in and out im taking it back there in 30mins for my 5th time. hope this helps a bit
cheers kyle

this sounds electical to me too.. Have you checked the spark plug wires. Sometimes when spark plug wires get hot they expand and open the circuit just enogh to stop operation, or if the spark plug wire has a crack in it, it will short to ground instead of firing the spark plug.

just a thought, no one had mentioned plug wires.

it is electrical they just gota find out where bouts along the line its failing

It sounds like Srinath's advice was to check that the ground wire to the battery is not taught (for example, if you're using an aftermarket battery).  And that the contacts are clean, especially between the big fat ground wire and the skinny ground wire, and the ground battery post.