Date: 28-03-24  Time: 23:45 pm

Author Topic: Yellow crap drained from carb bowl what is it???  (Read 2530 times)

psyfi_1

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Yellow crap drained from carb bowl what is it???
« on: 20 April 2018, 01:44:47 pm »
hi just drain carbs jet 3 for cyclinder three just spat out loads of yellow crud any ideas on what it could be??
its also in the airbox

Bretty

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Re: Yellow crap drained from carb bowl what is it???
« Reply #1 on: 20 April 2018, 01:59:26 pm »
I think there is an engine breather pipe that comes out the back/top of the engine into your airbox...
Yellow, sounds like a mixture of oil and water..

I've no idea how it gets there as I've not experienced it before... It could just be condensation, she might just want a good run if it's been sat all winter. Clean it up and give it a good motorway run.
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Re: Yellow crap drained from carb bowl what is it???
« Reply #2 on: 20 April 2018, 02:01:32 pm »
any chance of a pic of the crud
the yellow bit has me confused
is it bitty or sludge like ?

psyfi_1

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Re: Yellow crap drained from carb bowl what is it???
« Reply #3 on: 20 April 2018, 02:11:32 pm »
allass no its been cleaned now and float bowl runs clear petrol

its was definitaley thicker than petrol in air box but it seemed to flow quite easly from carb 3

i will run her till shes warm now and see if she spits more crap
« Last Edit: 20 April 2018, 02:13:25 pm by psyfi_1 »

celticdog

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Re: Yellow crap drained from carb bowl what is it???
« Reply #4 on: 20 April 2018, 02:16:13 pm »
Yep sounds like a bit of emulsified oil. If you're in the habit of wiping down your airbox with an oily rag or giving it a bit of a spray with wd40 it tends to gather there. I've just cleaned some out my airbox this morning! I'm about to give the carbs a good fettle this weekend once I feel confident enough, was it running lumpy? I'll let you know If I find the same in the carbs.
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BBROWN1664

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Re: Yellow crap drained from carb bowl what is it???
« Reply #5 on: 20 April 2018, 02:16:20 pm »
Petrol floats on water so I would suggest contaminated water.
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psyfi_1

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Re: Yellow crap drained from carb bowl what is it???
« Reply #6 on: 20 April 2018, 02:45:59 pm »
just pulled two rusted plugs out of the 3 and 4 cylinder the are literally only 6 months old what the fuck it doesnt look good one of them seem to be rusted in place

BBROWN1664

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Re: Yellow crap drained from carb bowl what is it???
« Reply #7 on: 20 April 2018, 02:58:41 pm »

Rusty around the top or the bottom?


If its the top, check the crap flap position and the drain holes in the head.
If its the bottom, you have a problem!
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psyfi_1

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Re: Yellow crap drained from carb bowl what is it???
« Reply #8 on: 20 April 2018, 03:22:05 pm »
there is rust all over even on the seal ring..................


i have change coils 2-3 over and no diference its still not getting as hot and i have changed plugs over seams to be really rusty where cylinder 3 spark is all along the thread ..... cylinder 3 spark seems higher than the other................


BBROWN1664

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Re: Yellow crap drained from carb bowl what is it???
« Reply #9 on: 20 April 2018, 03:57:35 pm »
2&3 use the same coil.
If #2 is OK then I would look at the lead to #3 and the cap assuming you have changed the plugs and you are sure you are getting enough fuel through to that cylinder.
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unfazed

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Re: Yellow crap drained from carb bowl what is it???
« Reply #10 on: 20 April 2018, 04:01:08 pm »
just pulled two rusted plugs out of the 3 and 4 cylinder the are literally only 6 months old what the fuck it doesnt look good one of them seem to be rusted in place
Parking on the sidestand for long periods uncovered in wet weather and/or fake NGK plugs .
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darrsi

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Re: Yellow crap drained from carb bowl what is it???
« Reply #11 on: 20 April 2018, 09:50:02 pm »
There's a picture or 2 of the honeycomb like residue that clogs up the airbox on here, i have tried but can't find them.
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darrsi

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psyfi_1

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Re: Yellow crap drained from carb bowl what is it???
« Reply #13 on: 20 April 2018, 10:06:48 pm »
yeh luckly not even close to that crap lol it wasnt even that much lol it did smell of petrol though.......


im thinking it was carb spitting feul back into airbox some how

darrsi

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Re: Yellow crap drained from carb bowl what is it???
« Reply #14 on: 21 April 2018, 07:30:46 am »
yeh luckly not even close to that crap lol it wasnt even that much lol it did smell of petrol though.......


im thinking it was carb spitting feul back into airbox some how


That was after i'd bought the bike, but in fairness when i did an oil change i pulled out 4 litres of oil as well.  :eek
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Re: Yellow crap drained from carb bowl what is it???
« Reply #15 on: 24 April 2018, 07:58:58 pm »
The yellow stuff sounds like a build up of fuel over time which has evaporated. If you have a dodgy carb float valve then it will  leak fuel (maybe back into the airbox, I can't remember) and that will evap off leaving the yellow oil.