What's going on?

[Magua]

Weather didn't look too bad outside so I thought I'd go for a ride. After about 30 mins of riding I pull up to some traffic lights. They changed to green so I twisted the throttle and the bike refused to move from it's 1000rpm idle, just sputtering for about 4 seconds before jumping to 4,000rpm.

Minutes later I pulled up to another set of lights and as I clutched in the bike stalled and refused to start, I kept at it twisting the throttle quite a bit which eventually got it going. Got the bike home and now it seems to be working fine :spudwhat:

Any ideas on what can cause this?

[Mongoose]

Weather didn't look too bad outside so I thought I'd go for a ride. After about 30 mins of riding I pull up to some traffic lights. They changed to green so I twisted the throttle and the bike refused to move from it's 1000rpm idle, just sputtering for about 4 seconds before jumping to 4,000rpm.

Minutes later I pulled up to another set of lights and as I clutched in the bike stalled and refused to start, I kept at it twisting the throttle quite a bit which eventually got it going. Got the bike home and now it seems to be working fine :spudwhat:

Any ideas on what can cause this?

Moisture somewhere, either lectrickery stuff or fuel?

[Magua]

Eh? So how do I tell so I can fix it?

[Mongoose]

Eh? So how do I tell so I can fix it?
Drain your carby, maybe even drain some of your tank with the reserve on(drains in lower down than "Normal". If that fails just start checking all things electric and spray with CRC as you go. You may never find out what it was by doing this.

[Magua]

God why did I buy such a piece of crap? All going well, it should be gone next week.

[Storm]

Any ideas on next bike?

[Mongoose]

God why did I buy such a piece of crap? All going well, it should be gone next week.
So you can learn, and not just about riding either :doobey:

[BugSplat]

High humidity & low temperature can lead to Ice forming in & around carburettor. Especially at idle low throttle opening’s, like idling at lights.
Could well have been cause of your problems.

[Magua]

Any ideas on next bike?
1991 GSXR250 The minute mine sells, the gixxer goes in for a pre purchase check. 45,000kms though. 12hp to 45hp, quite a jump for me.

[aff-man]

fun though :msn-wink: . Yeh could be a fuel line problem maybe a bubble or something i dunno.

[Two Smoker]

Telling you right now it IS WATER.... Drain your carb/s (and maybe check your tank) of the water. the gas stations are chronic for water at this time of year, and riding in the wet doesnt really help either...... had the same prblem with the CT110 last week....

[Mongoose]

Telling you right now it IS WATER.... Drain your carb/s (and maybe check your tank) of the water. the gas stations are chronic for water at this time of year, and riding in the wet doesnt really help either...... had the same prblem with the CT110 last week....

A cup of meths helps too :eek: No, not for the drinking of, but to put in the petrol tank now and then to help get rid of the water

[Magua]

Sooo how much meths? And just straight into the tank? Do I need to leave it for a while or can I put it in and head off for the daily commute?

[Two Smoker]

Sooo how much meths? And just straight into the tank? Do I need to leave it for a while or can I put it in and head off for the daily commute?
try half a cup to a cup, but i think your best best is to drain the carb.....

[Posh Tourer :P]

Are you sure you didnt just forget to turn the fuel on?

[Magua]

Drain the carb, hehe sure. I can't even point out the carb let alone drain it.
Actually I can, it's behind the cylinder right? :shifty: . I would have no idea how to remove it though.

[Two Smoker]

Man just looking at your profile picture, your bike is just ASKING for wheelies.... i would keep your bike and stunt it hehehe...

[Storm]

I know what you mean. My first bike was a GN 250 with 20-21 hp. When I took my across for a test ride, I just kept pulling over so I could gas it to the 100k again. I was grinning like a monkey for days afterwards :Punk: :first: Nothing like doubling your hp

[Posh Tourer :P]

Its easy. THere is a little clip on the bottom of it, and you undo that and take off the bottom bit of the carb (the float bowl). That holds all the fuel, tip that after looking to see if there is water in it (It'll look like there are two separate fluids in there). Then bung it back on, and turn on the fuel tap, and off you go....


Make sure you turn the fuel tap OFF before you remove the float bowl though, otherwise you'll piss fuel all over the place.

[Magua]

I have attempted a few wheelies, seemed kinda violent. Feels like I'm going to brake a cog or something. Anyway, I'll try draining or by the sounds of it tipping out the carb after school tommorow. Thanks guys :2thumbsup .

[marty]

my first thought was carb icing. it doesn't have to be freezing cold ambient for that to occur, in fact it can occur at up to 20 degrees C. it is the difference between the ambient temp and the dew point (the point that water condenses) that creates the carb icing condition. it is especially prevalent in conditions such as we have at the moment (wet, cold, humid)

i'd be dubious about water, as it doesn't clear easily by itself - it needs draining from the bottom of the carb bowl. there should be a plug with a straight blade screwdriver slot, in the bottom of the carb bowl. undo that, and drain about 100ml of fuel (and if there's any water) out. if you drain it into a glass jar or similar, you'll be able to see if there's any water in it.

[Magua]

Only 100ml? What if I was to drain it all out?

[marty]

there won't be anywhere near 100ml in the carb, but if 10ml of water came out then you've found your problem.....

water is much heavier than petrol, so it will be the first thing to drain out of the drain hole.

carb icing is a pain, as it quickly melts when the engine stops, and it's difficult to identify. it is more likely to occur at low throttle settings, as the gap between the butterfly and throttle body is very small. unless your bike is set up with a carb heat (like some cars have a 'winter/summer' setting on the airfilter), then it may give you some grief....

[Magua]

Take a look at these two pics of the carb, now what do I do to take the bottom off? (that is the carb right?).

[geoffm]

Drain the carb, hehe sure. I can't even point out the carb let alone drain it.
Actually I can, it's behind the cylinder right? :shifty: . I would have no idea how to remove it though.

Probably has a drain screw on the bottom of the float bowl. Undo this and out comes the gas. Turn the fuel tap off first...
Be careful and make sure the screwdriver fits properly. They make the screw heads from soft cheese.
Geoff

[Mongoose]

Take a look at these two pics of the carb, now what do I do to take the bottom off? (that is the carb right?).

I take it that your knowledge of thing mechanical is even more limited than mine.
The second close up pic you have shown is the best. At the bottom you can see in the pic the float bowl, so called because it has a float inside it. There are two screws that you can see, screwing from the bottom upwards, one in each corner. There will be another two in the corner out of pic. Those are the ones being refered to when people say "Just unscrew the float bowl"

[Posh Tourer :P]

SO to summarise, unscrew everything that is at the bottom pointing up. Start with the one in the middle if you can and it might drain, if not, undo the ones on the corners.

If it is a bit hard to get to, try pull off the fuel line, and then loosen the hose clip at the front. Twist the carb around so you can get at the screws.

[Magua]

Tried unscrewing it. It's in there REALLY tight, all I was doing was destroying the screwhead. I'll take it for a spin and if it's still playing up I'll dump in some meths with the petrol.

[vifferman]

In your second pic, the screw at the bottom is the drain screw. Use a screwdriver that fits really tightly to loosen it. If you catch the petrol that comes out ina glass jar, you can see if it has any water in it (there will be two layers, with the water at the bottom).

[Magua]

In your second pic, the screw at the bottom is the drain screw. Use a screwdriver that fits really tightly to loosen it. If you catch the petrol that comes out ina glass jar, you can see if it has any water in it (there will be two layers, with the water at the bottom).

Screw wouldn't budge, I was just destroying the screwhead.

[Mongoose]

Screw wouldn't budge, I was just destroying the screwhead.

Magua, is there no spanner type man handy to you at all? If so, get to now them and ask, most are willing helpers, well if they do it as a hobby, some full time spanner shfters dont like teaching.
It would be a lot easier for you to understand and for them to give direct tips on what you are doing.
Just an idea.

[FROSTY]

dude the easy/cheat way with the GN125 is to loosen the two screws holding the carb clips in place (the big hose clips on the rubbers either side of the carb body) Then just rotate the carb body 30 degrees either way.
Use a decent quality screwdriver and remove the 4 screws holding the bowl on the bottom of the carb.The bowl will now fall off
empty whats left in it out and reassemble.