Just bought another Honda Sky, initially to break for parts, however it's not in to bad condition....starts and runs, but leaking oil out of l/h side crankcase cover, which leads me to believe that the crank seals are u/s...….has anyone ever changed the seals on this model ?...….beginning to think I might re-build this donor machine instead......Del.
Not done a sky, but plenty of sfx which are the same engine. I would change the crank bearings. Its a bit of a weak spot on those. Fairly straightforward job, you can do it in a day or a weekend if you take it slowly. The peugeot speedfight has a very similar engine, if you cant find pics of the Honda rebuild you will find pics of a pug.
Thanks for that....I think it must be the seals, I can't see any other way that oil would get into crankcase, it is where the drivebelt is, so should run dry......
O.K....Just waiting for the new ignition switch to arrive, so that I can fire her up, as have taken the crankcase cover off, which contains the kickstart mechanism....if it IS the crank seals, and I suspect that it is, do I need any special tools ? like a drawer or something ?
You can use a self tapper and pull the old one out, then a punch to push the new one in really carefully. Is the ignition switch the same as SFX as in 2 wires?
Thanks for that.....no, the sgx has four wires, I can hot wire it, but would rather wait for new switch, I don't want to do any further damage to electrical system.
Yeah I thought it was 4. I think the sfx is the exception. Ive only ever seen them with that type of switch. Hope it comes quick. Sometimes post takes forever.
Just fired her up, and it has proved three things....1. the new ignition switch works 2. the lights work, and 3. as suspected, the crank seals need replacing......interesting times ahead...….
Not really, although I have never had her at full revs....is there anything else that it could be ? besides the crank seals.....bearing in mind this thing has probably been stood for six or seven years, I suspect that the seals have dried out......
Ah. The oil pump has leaked through, filled the crankcase with oil and then the crankcase pressure has blown the seals out. Guessing the oil bottle was empty.
Mmmhhh……...that could be the case, although when I got her the oil tank was nearly full, but who knows what someone has done in the past ?....first thing is to get to the l/h side seal, and see what's going on.
Thinking about it, it only leaks oil into the outer crankcase cover while it is running, it has been stood for over week, and on removing the cover it was completely dry.....gonna take the front pulley, and whatever is behind it off today, I may even get the seal out, before ordering the new one's.....here goes......
That's made a start, but this starter ring gear is proving "challenging" to remove......there must be a special tool to remove it, I may be able to make one, I also notice that there is no square part, on the end of the crank, nor is there any hexagon for an allen key....how do you prevent the crank from turning while unscrewing the ring gear ? which I presume unscrews clockwise, against the turning cycle of the engine...….
Just been looking at the workings of an old 50cc SYM scooter engine, that someone gave me....the starter ring gear is on the OUTSIDE of the variator pulley, and is on splines......two minutes and you can get to the crank seals...the annoying thing is it is probably made by Honda as well.....