My GN 125 has packed up after my first ride

[crewzer]

Apologies if this is just boring and impossible to remedy via a forum but I'm a complete newbie to bikes and I want to give as much detail as possible.

I bought a suzuki gn 125 '02. The seller brought it round to my house on a trailer, my boss (who knows his bikes) tried starting it up, it cut out a few times but he adjusted the throttle at the carb, gave it some choke and within a minute he was riding it around with no problems.

Later that night I started it up first time as it was already warmed up and took it for a ride. It was my first time on a geared bike, I kept stalling it, nearly flipped it into a parked car and rode around too much in first and second waking up the neighbours. After stalling it on my street for the twelfth time I gave up and rolled it home.

The next day I couldn't get it started. At this point I didn't even know where or what the choke was so I sat trying to get it started for a bit then gave up.

The following day I'd learnt about the choke so tried that but just flooded the engine and it kept popping loudly. I turned the choke off, the popping stopped but I still couldn't get it started. Gave up.

The following day I learned how to bump it but that didn't work either.

Today I charged the battery, took out the spark plug and cleaned it up with some sandpaper. Tried it again, it sounds better but still won't tick over.

My boss had a look and thinks the sparkplug and/or battery need replacing so I've ordered new ones but I find it hard to believe they just happen to of packed up after my first day with no problems.

So in the mean time (as I wait for my plug and battery) does anyone have any other ideas as to what the problem might be?

Thanks for reading.

[gerg]

first thing to do is check the spark plug is sparking. Unscrew it, turn the engine over and see if you can see it sparking.

If it was running the other day it will probably run again fairly easily. I wouldn't worry too much.

[Rogerborg]

[jaffa90]

Some boss as said, a multimeter will test all without just guessing.

[crewzer]

I topped up the levels in the battery but it will still only charge to about 90%. I put my multimeter on it, I get the correct 12v but it drops to about 10 when I hit the starter which my boss said is quite bad. To be honest I'm not sure how to test the amps with my meter but I'm buying a new battery later regardless.

I got a new spark plug, it sparks better and the bike sounds better when I try and start it up but still no joy.

A friend of mine came round and took the carb to bits. He's knows what he's doing but he's not overly familiar with 4 strokes and a couple of little spouts had him perplexed, one he said is an overflow but he has a hunch that a pipe might be missing from the other, I'm going to Google that now.

[andyscooter]

battery should be about 12.5 sat without bike running

and drop to about 11.5to 12 under load
____________________
gilera runner vxr200 (chavped)
if its spelt wrong its my fat fingers and daft auto correct on my tablet

[mudcow007]

Ok, if you boss was able to ride it around for a bit, I will assume the bike is ok-ish with nothing major missing

To me it sounds like you have flooded the plug, which is now wetter than a ducks bum in a pond.

remove said spark plug, check what colour it is (bets are its blacker than a witches hat) dry all the fuel off an wipe any blackness away

refit, turn choke to full, dont touch the throttle see if it starts off the button

if not try a bit of throttle this time

as soon as it fires turn down the choke a bit as it will run at about million revs, piss your neighbours off an waste fuel

enjoy

[crewzer]

https://g02.a.alicdn.com/kf/HTB1YQVBLpXXXXbuXpXXq6xXFXXXF/Super-performance-MIKUNI-26mm-Motorcycle-Carburetor-Carb-For-Suzuki-EN125-GS125-GN125-moto-carburador.jpg_640x640.jpg

Aha! My friend was right there are 2 tubes missing from the carb! we assumed the seller had been fiddling with the carb as all the nuts were pretty loose and he must not have refitted the tubes properly and they have fallen off whilst I was riding it.

Only question now is, what are these tubes and where do they go? I'm assuming one is the overflow and it's not overly important. [/img]

[Holdawayt]

Just to check, as you're new to bikes...

Have you turned the fuel tap to the "on" position? If it was delivered on a trailer I'd assume the fuel would've been turned off. It would still run for a bit but it would soon start cutting out and eventually not start at all.

Please tell me you've checked this first.

[crewzer]

[P.addy]

One is fuel going on, one is overflow.

Where are you based?

[crewzer]

[mudcow007]

where are you based?

There maybe someone on here who is local who can give you a hand...

[crewzer]

I've got a new battery currently on charge. I'm not sure if it's the root of my problem but it needed replacing anyway, so did the spark plug which I've done too.

I've done a bit googling about these carb hoses. I think what I'm missing is a vacuum hose. Would this explain my problem? Where does the other end of the vacuum hose go?

[Polarbear]

[crewzer]

[stinkwheel]

Does it have fresh petrol in it?

If you haven't put any in, do you know how long it was unused before being delivered to you?

Petrol can go stale even in a couple of months. They don't run well on stale fuel.

[crewzer]

[mudcow007]

How come you put snake oil in.....sorry Redex?

Unless it went bang, I cant see how it was working A-OK one min then the following day its flat as a witches tit?

How is fuel fed to the carb, is that your missing pipe (vac pipe to the fuel tap)

Is the plug wet after you have tried to start it?

Can you get fuel to flow from the over flow? (small screw on the bottom of the carb bowl) - this proves fuel is getting to the carb

bikes only need fuel an air to run - oh an a bit of tender love, have you tried stroking it?

[Minty]

[Holdawayt]

If it's a missing hose that's preventing it from running how do you explain the fact it was running well the day before your issues started?

Did someone steal your hoses? Have they both fallen off?

Nope.

Crank it over for a bit, remove the plug and see if it's wet. If it's not then you've got a fuelling issue. If it's wet, test the plug for a spark. If you have no spark inspect the ignition system. If you have both fuel and a spark then it must be an air delivery issue although this is highly unlikely given the design of the GN carb.

[mudcow007]

[crewzer]

[Minty]

Maybe give your boss a punch in the nuts?

A bike delivered on the back of a truck with immediate fuelling issues and subsequent tendency to drop into first gear of it's own accord?

But at least he knows his bikes, eh? Just how much has this bundle of joy set you back?
____________________
My fingers smell of your mum.

[crewzer]