Ive got a 2 stroke racing motorbike, but recently ive noticed some black goo dripping from my exhaust. Only a little bit mind you, but was wondering why. I understand the petrol oil mix is gonna make a lot of smoke, but blank gunk?
2007-11-20 07:00:57 · 10 answers · asked by alex p 3 in Cars & Transportation ➔ Motorcycles
It's normal for two-strokes to produce some oil,if it was all burnt then it wouldn't lube the engine.The reason you see it dripping from exhaust manifold is that you have a leak.It would normally run into exhaust,where,over time it would mostly dissipate with heat with a small amount collecting on exhaust.It would also help to make sure tou have the correct oil/fuel ratio.
2007-11-20 07:20:03 · answer #1 · answered by Ninky Nonk---In The Night Garden 4 · 0⤊ 1⤋
Try Amsoil Dominator oil you mix it 50:1 also it is normal to have some build up. In a 2 stroke engine oil and gas are mixed you allready know that. What happens when you shut it off there is gas and oil in the bottom of the crankshaft this is normal. after it sits for a while the gas evaporates and there is oil left. so the next time you start it you get extra oil to burn on start up. some of that oil will simple not burn but will get pushed into your exhaust system. and it also picks up any carbon residue that is left in the exhaust pipe so thats why it's black.
It also could be jetted rich
2007-11-20 18:06:39 · answer #2 · answered by idahoatvryder 2 · 0⤊ 1⤋
When was the last time you rebuilt the top end? (cylinder, piston & rings).
It might be time, if it's been awhile.
When a 2 stroke loses compression, the oil in the pre-mix doesn't get fully burned and oil builds up in the exhaust.
Eventualy dripping "black gunk".
2007-11-20 15:21:52 · answer #3 · answered by guardrailjim 7 · 0⤊ 1⤋
its no problem it occurs in all 2-strokes its just residue from the petrol and oil mix dont worry its fine.
2007-11-21 17:13:33 · answer #4 · answered by Darren R 2 · 0⤊ 0⤋
i have bought new moto cross 2 stroke 50cc for my son after usin one day my bike doesnt start a my spark plug got black oil and i have cleaned it after that its back to normal after next day i wanted to start again it wont start what should i do buy a new spark plug or ? i am harry
2014-03-10 16:56:56 · answer #5 · answered by EWNS 1 · 0⤊ 0⤋
the smoke probably built up in your exhaust system
you might want to clean that out and check your oil gas mixture ratio to see if they're correct, you might be adding too much oil
2007-11-20 15:05:11 · answer #6 · answered by somwone145 3 · 0⤊ 1⤋
you're using to much oil in the mix
2007-11-20 15:05:33 · answer #7 · answered by randy 7 · 0⤊ 1⤋
its norm you should be able to take out baffles and burn off excess oil and carbon
2007-11-24 14:15:00 · answer #8 · answered by c5 4 · 0⤊ 0⤋
That means it is time for you to re-pack the silencer.
2007-11-20 16:16:44 · answer #9 · answered by barry m 5 · 0⤊ 1⤋
probably just build up from the exaust.
2007-11-20 15:03:59 · answer #10 · answered by z000z 3 · 0⤊ 1⤋