Post by prodigit on Jun 14, 2013 1:02:22 GMT -5
Most scooters have a CVT.
You can clearly feel when the engine is vibrating more. You should find the thinnest oil where the engine is as stable (vibrates the least) possible.
On my Roketa MC-05-127, they use a wet clutch, and gears. Because the engine's tolerance is so small, it requires thin oil. The gearbox and engine use the same oil. The gearbox needs 10W30, or preferably 15W40.
15W40 is too heavy for the engine,
so I have to mix my own juice.
I used to mix 10W30 with 15W40, but that's too heavy.
I tried 5W30, but the wet clutch is slipping, and it's not good on the gears.
So 10W30 is my perfect mix for this motorcycle.
Like said, most scooters have a CVT with separate CVT oil, that's often between 75W90 to 80W140. Since the Honda clone engines are old engines, and tolerances are rather large, you can fit upto 15W40 in it without problems (that is for hot summer environments).
I wouldn't go higher, because the higher, the more resistance the oil brings, and often it's cooling capacity goes down.
Having too thick oil may actually be hard on the bearings, and in some cases make them overheat and break (say you're putting 15W50 or 20W50 in there, going WOT may cause extra strain on the bearings, and on top the thicker oil does not flow into these bearing rollers as easily as thinner oil, causing less cooling).
There's a sweet spot, and most of the time, the best way to find that out, is at the beginning (engine break in) .
Start with 5W30 or 10W30 oil, then on the next oilchange (50-100 miles) change to 10W40, the next one (150 miles) change to 15W40, and see if the engine vibrates less or more.
Find that spot where it vibrates the least. (say eg: at 5W30 it vibrates a lot, 10W30 a bit, 10W40 almost not, and 15W40 almost not; then get 10W40, because it's lighter. You can also mix 10W30 and 15W40 giving 12W35. If it's not giving you good starts, do a 75/25 mixture of 10W30 and 15W40, giving something like 11,5W32,5. If the 11.5W32.5 mixture is the same as the 10W40 (engine vibration wise), you're better off with the mixture than with 10W40.
Usually it never matters, because chinese engines need to be oilchanged well before the oil goes bad. The impurities are what forcing you an oilchange, not the oil losing it's lubrication.
Quite often at 1000-3000 miles, the oil is still good for
-98%, but needs to be filtered. That's why bad oil goes to recycling companies, that create good oil from it, it doesn't go straight into the trash.
Also, if it has starting issues, can be because of too thick oil.
If starting gets tougher, let some of the oil go, and mix it with lighter oil (eg: you put 15W40 in it, but starting takes too long, get a few oz out, and fill it up with 5W30. A 50/50 mixture of 5W30 and 15W40 should give close to the same effect as 10W35 oil.
You can clearly feel when the engine is vibrating more. You should find the thinnest oil where the engine is as stable (vibrates the least) possible.
On my Roketa MC-05-127, they use a wet clutch, and gears. Because the engine's tolerance is so small, it requires thin oil. The gearbox and engine use the same oil. The gearbox needs 10W30, or preferably 15W40.
15W40 is too heavy for the engine,
so I have to mix my own juice.
I used to mix 10W30 with 15W40, but that's too heavy.
I tried 5W30, but the wet clutch is slipping, and it's not good on the gears.
So 10W30 is my perfect mix for this motorcycle.
Like said, most scooters have a CVT with separate CVT oil, that's often between 75W90 to 80W140. Since the Honda clone engines are old engines, and tolerances are rather large, you can fit upto 15W40 in it without problems (that is for hot summer environments).
I wouldn't go higher, because the higher, the more resistance the oil brings, and often it's cooling capacity goes down.
Having too thick oil may actually be hard on the bearings, and in some cases make them overheat and break (say you're putting 15W50 or 20W50 in there, going WOT may cause extra strain on the bearings, and on top the thicker oil does not flow into these bearing rollers as easily as thinner oil, causing less cooling).
There's a sweet spot, and most of the time, the best way to find that out, is at the beginning (engine break in) .
Start with 5W30 or 10W30 oil, then on the next oilchange (50-100 miles) change to 10W40, the next one (150 miles) change to 15W40, and see if the engine vibrates less or more.
Find that spot where it vibrates the least. (say eg: at 5W30 it vibrates a lot, 10W30 a bit, 10W40 almost not, and 15W40 almost not; then get 10W40, because it's lighter. You can also mix 10W30 and 15W40 giving 12W35. If it's not giving you good starts, do a 75/25 mixture of 10W30 and 15W40, giving something like 11,5W32,5. If the 11.5W32.5 mixture is the same as the 10W40 (engine vibration wise), you're better off with the mixture than with 10W40.
Usually it never matters, because chinese engines need to be oilchanged well before the oil goes bad. The impurities are what forcing you an oilchange, not the oil losing it's lubrication.
Quite often at 1000-3000 miles, the oil is still good for
-98%, but needs to be filtered. That's why bad oil goes to recycling companies, that create good oil from it, it doesn't go straight into the trash.Also, if it has starting issues, can be because of too thick oil.
If starting gets tougher, let some of the oil go, and mix it with lighter oil (eg: you put 15W40 in it, but starting takes too long, get a few oz out, and fill it up with 5W30. A 50/50 mixture of 5W30 and 15W40 should give close to the same effect as 10W35 oil.
