66cc skyhawk gt5 slant head, 2009 manufacture, 4 gallons of gas through it so probably 400-600 miles on it. 25:1 lucas semi-synthetic is what I run.
I've recently got a new rattle in the engine assembly. My bike maxes at about 30mph even and I usually ride at probably 28mph. The normal vibrations (the ones that shake the bike because I didn't put rubber in my mounts) get noticeable around 25mph or so. Usually I don't hear any noises besides some chain rattling (haven't upgraded the chain yet) even wide open. However, in the past couple days, the motor has started to make a pronounced rattling noise at about 25mph or more. I don't have a tachometer, so I can't speak on that, but the rpms where the rattling starts is right around the point where the "normal" vibrations start to get noticeable.
It's hard to describe the rattling, except that it's very noticeable and goes from nonexistant to very noticeable in a very short rpm variation. It sounds like something needs to be tightened down. Like something that turns isn't tightened down and is rattling around on the inside. It's hard to say if it's coming from the engine or something inside the engine compartment.
I originally thought it was one of the many noises that come from the driveshaft/engine sprocket area. But, I discovered that if I pop the clutch and rev high, the rattle will happen when not in gear. When revving in "neutral", the rpm level at which the rattling occurs is right at that "borderline area" where you don't want to rev it any higher in neutral.
Also, I noticed a lot of oil on the bottom of the motor today. I noticed because my exhaust pipe was smoking due to oil on the outside and took a look. This thing has always leaked a certain amount of oil and I could easily see this being a coincidence, even though it is more oil than I've seen on it before.
I recently oiled the gears inside the clutch area in accordance to some tutorial on this forum, so I don't think it's that.
Any ideas? I can probably take it apart to look at stuff sometime next week, but haven't even taken the casing off the clutch to look yet.
I've recently got a new rattle in the engine assembly. My bike maxes at about 30mph even and I usually ride at probably 28mph. The normal vibrations (the ones that shake the bike because I didn't put rubber in my mounts) get noticeable around 25mph or so. Usually I don't hear any noises besides some chain rattling (haven't upgraded the chain yet) even wide open. However, in the past couple days, the motor has started to make a pronounced rattling noise at about 25mph or more. I don't have a tachometer, so I can't speak on that, but the rpms where the rattling starts is right around the point where the "normal" vibrations start to get noticeable.
It's hard to describe the rattling, except that it's very noticeable and goes from nonexistant to very noticeable in a very short rpm variation. It sounds like something needs to be tightened down. Like something that turns isn't tightened down and is rattling around on the inside. It's hard to say if it's coming from the engine or something inside the engine compartment.
I originally thought it was one of the many noises that come from the driveshaft/engine sprocket area. But, I discovered that if I pop the clutch and rev high, the rattle will happen when not in gear. When revving in "neutral", the rpm level at which the rattling occurs is right at that "borderline area" where you don't want to rev it any higher in neutral.
Also, I noticed a lot of oil on the bottom of the motor today. I noticed because my exhaust pipe was smoking due to oil on the outside and took a look. This thing has always leaked a certain amount of oil and I could easily see this being a coincidence, even though it is more oil than I've seen on it before.
I recently oiled the gears inside the clutch area in accordance to some tutorial on this forum, so I don't think it's that.
Any ideas? I can probably take it apart to look at stuff sometime next week, but haven't even taken the casing off the clutch to look yet.