NC35 refitted cleaned carbs.... fuel leaking out of overflow

Post by **GFRacingUK** » Wed Jun 20, 2012 10:59 pm

ok, i finally got the carbs back on tonight, connected up a remote gravity fed fuel tank (not the bikes tank ) connected it to the main fuel hose, and theres fuel overflowing out of the 2 top carb overflow pipes, and what sounds like into the inlets.... what have I done wrong? and im guessing the carbs are gonna need removing and opening up again!?!

hardnutdvd · Post by **hardnutdvd** » Wed Jun 20, 2012 11:55 pm

i have no idea if it makes a difference from proper tank or gravity fed tank.. but i have read that the floats can stick, causing fuel to overflow. or improperly set float height...
if their sticking a gentle tap on the carbs can sometime sort it...
there is also a good template you can make using a credit card to set the float heights to correct setting on here too.

saying all this, i am by no means an expert. just repeating what i have learnt on here.

amaechizzle · Post by **amaechizzle** » Thu Jun 21, 2012 4:19 am

+1
If you havent thrown your float heights way out, sometimes they stick when your putting them back together.
Either a soft tap with a rubber mallot is worth a try, or pull it all back out and refit it again.

Last time it happened to me, my back two cylinders compression locked on start up after putting everything back together.

vfrman · Post by **vfrman** » Thu Jun 21, 2012 4:27 am

What they said. It is a float.

Post by **GFRacingUK** » Thu Jun 21, 2012 7:12 am

Thanks guys, that makes sense, after further investigation, number 2 cylinder is full of fuel.... awesome!

whats the best thing to do? I can stick a syringe down with a tube on and get most of the fuel outo of the inlet tract, but Im guessing the cylinder will also be full, if the valves are partially open? Do I need to hand turn the engine over with the plugs out, and then use the syringe down the plug hole?

vfrman · Post by **vfrman** » Thu Jun 21, 2012 9:51 am

If you have a cyl full of fuel, you need to get the oil changed out as well. The fuel will move past the rings and dilute the oil....don't ask me how I know!

hardnutdvd · Post by **hardnutdvd** » Thu Jun 21, 2012 1:41 pm

lmao vfrman... just seen your sig...

i wrote off my r125 on a head on collision with a 2010 model Audi s4 in 2009

vfrman · Post by **vfrman** » Thu Jun 21, 2012 2:36 pm

Yeah....I didn't edit that! I also like how it lines up with the earlier statement about not needing a rear brake...

Post by **GFRacingUK** » Thu Jun 21, 2012 4:49 pm

good advice, I was gonna do an oil change anyhow, Im just glad I didnt do it prior to this carb issue!

Post by **lizard821000** » Thu Jun 21, 2012 5:24 pm

i had the same proble mate, i tapped all the carbs with a rubber mallet n screw driver and it stopped the overflow....... and prob had a sticky shut of valve too, sorted with a general tapping .

i used an auxilry tank too, gravity feed. i feared i most likely flooded a cylinder, i just run it up to clear it out lol am i fk taking her apart again to remove the buried plugs on these things!! lol

NC35 refitted cleaned carbs.... fuel leaking out of overflow

NC35 refitted cleaned carbs.... fuel leaking out of overflow

Re: NC35 refitted cleaned carbs.... fuel leaking out of over

Re: NC35 refitted cleaned carbs.... fuel leaking out of over

Re: NC35 refitted cleaned carbs.... fuel leaking out of over

Re: NC35 refitted cleaned carbs.... fuel leaking out of over

Re: NC35 refitted cleaned carbs.... fuel leaking out of over

Re: NC35 refitted cleaned carbs.... fuel leaking out of over

Re: NC35 refitted cleaned carbs.... fuel leaking out of over

Re: NC35 refitted cleaned carbs.... fuel leaking out of over

Re: NC35 refitted cleaned carbs.... fuel leaking out of over