Carburettor over fuelling ?

[Captain Black]

Been on a good run today on the GS 80, while traveling at about 120kmh it felt like the beginnings of going off the main fuel tank supply, but it had plenty of fuel in the tank. It cleared and then seemed to run ok. Now I've just been in traffic and same sort of feeling. When I got home put the bike on the side stand and fuel was leaking from the right side carb..... Overflow ? Anyway took the float bowl off and it was full to the brim.
Is it a float issue perhaps ?

 

[ChasF]

Happens quite often on mine. Just take the float bowl off and push the float up gently a few times to seat the needle valve. Works for me.

 

[B Murr]

happened to me a few times on a previous GS, float bowl off and jiggle the float a little frees up whatever the float was gettinmg caught on. You do have an in line filter fitted I'd guess, if not it I wonder could it be a bit of grit gettingb through.

 

[Captain Black]

Happens quite often on mine. Just take the float bowl off and push the float up gently a few times to seat the needle valve. Works for me.

Ok cheers.

Same symptoms when riding chas ?

 

[Captain Black]

happened to me a few times on a previous GS, float bowl off and jiggle the float a little frees up whatever the float was gettinmg caught on. You do have an in line filter fitted I'd guess, if not it I wonder could it be a bit of grit gettingb through.

No inline filter but something I'd thought of adding on my airheads.

 

[Captain Black]

I did have the throttle fully open to the stop on the motorway could that have unseated something perhaps ?

I've just done the jiggle fix and on the centre stand no fuel leaking and it seems to rev ok on the throttle.

I'll test ride it tmrw.

 

[Kenny]

If it keeps re-occurring then you will need replacement float needles. They are easy to replace and although look good to the naked eye, they do wear. They are about a fiver each and simply clip onto the small spring clip of the carb floats.

 

[Captain Black]

If it keeps re-occurring then you will need replacement float needles. They are easy to replace and although look good to the naked eye, they do wear. They are about a fiver each and simply clip onto the small spring clip of the carb floats.

Thanks Kenny, I'm out tmrw on a breakfast test run.

Gonna get some in line fuel filters as well just incase its crud causing it .

 

[Beemerboff]

Where can you buy them for a Fiver - most want two or three times that!

 

[Kenny]

Motorworks

 

[Captain Black]

Seems to be ok now....

 

[Redboots]

Gonna get some in line fuel filters as well just incase its crud causing it .

Threw mine away, they looked shite.
Cleaned and checked that the filters on the fuel taps had no holes. Never had a problem with dirt in the carb.

 

[Captain Black]

Threw mine away, they looked shite.
Cleaned and checked that the filters on the fuel taps had no holes. Never had a problem with dirt in the carb.

I've ordered 6 today for my airheads...

 

[Beemerboff]

Kenny , on the Motorworks site only the pre 79 float valves are a fiver, the GS type that the OP requires are twice that.
Dont know if if the early type will work in the later carbs, if anyone has fitted them let us know how it went.!

 

[Rob Farmer]

I've ordered 6 today for my airheads...

Waste of money usually. The mesh in those filters is too large to stop most of the small debris that gets stuck under the needles. You'd have been better off swiling your tank out.

 

[Captain Black]

Kenny , on the Motorworks site only the pre 79 float valves are a fiver, the GS type that the OP requires are twice that.
Dont know if if the early type will work in the later carbs, if anyone has fitted them let us know how it went.!

I've ordered a spare think they're about 11 quid.

I'll put it in the draw with my inline filters for a few years.

 

[Captain Black]

Waste of money usually. The mesh in those filters is too large to stop most of the small debris that gets stuck under the needles. You'd have been better off swiling your tank out.

I've ordered the Mahle inlines from motor works , the PD has been fine, just the 80 at high speed on the motorway was feeling as though fuel was the problem.
I'll stick em on and see how I go , if not I've got done spare hose.

I thought Mahle would be pretty good, I use the oil and air filters on my aircooled 911s and they seem very good.

Belt and braces and all that cr**.......

Edit; just as a thought

If the tank is kept pretty full and not allowed to run down to reserve that would maybe prevent shit at the bottom of the tank getting sucked in , and kep the inside tank filter clean ( ie submerged ) the GS80 played up after I'd taken it down to reserve then stuck a tenner in it.

 

[Kenny]

Only way you will find out if you run her without any inline filter. If all OK, then remove petcocks and check the tank guaze. If they are also claen it may well be your float levels being a tad to low and starving the carbs at higher revs. Should run cleanly up towards 100 mph or thereabouts !

 

[Captain Black]

Only way you will find out if you run her without any inline filter. If all OK, then remove petcocks and check the tank guaze. If they are also claen it may well be your float levels being a tad to low and starving the carbs at higher revs. Should run cleanly up towards 100 mph or thereabouts !

Cheers Kenny, I ran it upto about 140 kmh yesterday and it seemed good.

The problem reared its head around the 120 kmh the other day so I'm hopeful it was the float wiggle that cleared any crap out. I'll thrash it on the next ride to make sure...