Carb needle pic

[Dave M]

https://i1214.photobucket.com/albums/cc487/weedave1/Mobile%20Uploads/8F43733A-B590-492A-A493-D9DBFE722798.jpg

Could this have been cuasing the fuel going into oil?

[Vincent]

Impossible to tell......... even if the pic was in focus.
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[orac]

a litte more context would be helpful too, what bike, is it gravity fed carbs.
over filling may cause fuel to leak down the intake and seep around the rings into the sump oil if the needle didnt seat correctly
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Current rides - 2016 Triumph Street Triple Rx, 1994 Suzuki Bandit 400 VM, TGB 204 Classic 125cc
"with nothing left to lose, there is everything to gain. It's not the size of the dog in the fight, it's the size of the fight in the dog"

[Dave M]

https://www.bikechatforums.com/viewtopic.php?t=291168

Hope this helps.

[orac]

this wont be very helpful, but i did find your problem
Hyosung gt125

the chances of needles being the primary issue is very slim, clean with some carb cleaner and reiinstal.

have you checked the vacuum pump, ie is shutting off. if it shuts off when the bike is off, you will need to attacth the carb to the fuel feed and position as though they were on the cylinder (but not on the cylinders, pull vaccum (suck on the pipes from intake rubbers), it will take a while for the carbs to fill (once you have a vacuum on the pipe, stick your tonk over the wholes, it make it alot easier to breath), once they are full, they will start to over flow if there is an issue
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Current rides - 2016 Triumph Street Triple Rx, 1994 Suzuki Bandit 400 VM, TGB 204 Classic 125cc
"with nothing left to lose, there is everything to gain. It's not the size of the dog in the fight, it's the size of the fight in the dog"

[mudcow007]

basically look at the rubbery end of the valve, if it has lines/ grooves in it, its worn

mine were about £6 offa ebay

[Robby]

The only way to tell is to replace it, usually along with its seat. You will need to check/adjust the float height afterwards - sometimes aftermarket ones are a slightly different length, which will screw up the float height.

[Vincent]

A test I sometimes try...although more to do with setting the float height really......if you have the carb off the bike, set up the float and needle but leave the bowl off, (keep the carb straight so the float pivot pin won't come loose). GENTLY...blow into the fuel intake, (if you leave the pipe on, it's a lot easier). While you are everso gently blowing into the fuel intake, move the floats up and down. You should hear and feel the valve shut off. Now this won't show up every problem as the fuel level rising in the bowl won't be pushing anywhere near as much as you will be with your finger but it gives you an idea how it all works and can show up some of the more obvious faults.
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[Dave M]

Valves have no lines/grooves so they seem ok.
Float height is a bit of a grey area. The service manual says 17mm BUT it has been said on numerous occasions that this was a misprint? It says 17mm on 2 different sections in the manual? Can they be wrong twice? No one seems to know the proper height if the height in the manual is actually wrong. Does 17mm sound about right?
I will be checking the pump tomorrow. Carbs have 82.5 main jets in both. Supposed to be an 87.5 in front and a 90 in rear. I was thinking maybe I could use a clamp on the fuel line when the bike is stood to see if that could stop any fuel going to carbs as a temp. measure. Thoughts on this please? Thanks for help and patience!

[temeluchus]

Would it be possible to get a decent pic of the needle?
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[Dave M]

https://i1214.photobucket.com/albums/cc487/weedave1/Mobile%20Uploads/13663577-FC48-418D-89BB-A58BAC94958E.jpg

That any good?

[davebike]

If the tip is a discoloured as it looks in that picture it is knackered !

Dave
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Dave
NC750Xdct + others at work !
davebike1@gmail.com

[Dave M]

Hi Dave,

It was green gunk and it came off easily with a good soak in carb cleaner. Looks like new! Is it likely to keep happening? Cheers.

[davebike]

The rubber "tip" has been damaged by old fuel Common problem lots of do this it will fix it stories but unless time no problem just replace the needle

Drain carbs if bike is to stand fro more than a couple of weeks
____________________
Dave
NC750Xdct + others at work !
davebike1@gmail.com