As a motorcycle engine is more unforgiving on the oil (2 stroke more so as its hotter), the higher number declines with time and becomes thinner.
A 10W40 can become 10W30 near oil change time.
Iv heard that Mobile 1 is the best at retaining its viscosity over a given time period.
Just change oil at the right time to keep engine clean and ensure that oil is nice and thick till the end.
I personally add a little additive (stp engine treatment etc) to further increase the viscosity from 20W60 to around 20W70.
Sorry for repeating but the bottom line is to change oil regularly. I do so at 1000 km which is less than 1000 miles. No matter how clean or thick the oil may seem. One guy even told me to change at 500 miles interval.
--- In Honda-C70@yahoogroups.com, "A" <ak6666666@...> wrote:
>
> Julie:
>
> You asked a good question. I had similar questions a little while ago.
>
> From this group I gleaned the following wisdom:
>
> Car engine has oil filter which keeps oil clean at all times.
> It has lower maximum working temperatures due to radiator.
> Its clutch is not bathed in engine oil.
>
> Your C100 is 4 stroke, with no separate oil filter and it goes against the above three car methods.
>
> No oil filter to change regularly.
> Higher max temperatures if running slow in traffic.
> Clutch is in the engine oil and sheds tiny particles into the oil.
>
> Both car and motorcycle also add stuff to oil through blow-by, which is matter which passes from exploded gases in chamber, goes past ring pistons and mixes with engine oil. Car filter removes this but motorcycle does not. This keeps accumulating.
>
> So. Motorcycle oil runs hotter and has regular addition of particles to it and no removal of particles.
>
> Rule 1. Change oil at 600-1000 miles like clock work. Most important.
> Rule 2. Using expensive oil is just a waste of money. API SH-SM they usually mean more interval between oil changes, but that is against Rule number 1.
> Rule 3. In summer, the right two digits in multi grade oils should be higher. like -40 or -50. In winter the left two or three digits should be smaller like 10W or 15W.
> Rule 4. Not to use energy conserving EC thin oils. They are too slippery and the clutch plates will start slipping when they should not.
>
> So. I give most importance to rule 1 and choose 20W50 or 20W60 all year grade. But my summer reaches 48C, whereas body temp is 37C.
>
>
> So, chose 10W40 or 20W50, observe rule 1 (to flush out the accumulated particles), stay away from EC and expensive oils.
>
> That's my two cents.
>
> Hope it helps.
> Ali
>
>
> --- In Honda-C70@yahoogroups.com, "Julie Y" <juliey@> wrote:
> >
> > After reading on here about using Motorcycle oil in our C100, I went to O'Reilly's Auto Parts to get some, today. Here is how the conversaton went:
> >
> > Me: Do you have motorcycle oil?
> >
> > Guy: Yes. Aisle 5.
> >
> > Me: Cool. Do you know anything about it?
> >
> > Guy: Nope. Lew has a Goldwing. He will know.
> >
> > Me: OK. Do you have Mobile 1 4T racing oil, 10W 40? ( read about that on here)
> >
> > Lew: No. Is it a 2 stroke or a 4?
> >
> > Me: I don't know. It's a 1965 Honda C100...
> >
> > Lew: 2 stoke. This is what you need. 10W 40
> >
> > Me: But it says synthetic on it. My car guy always told me not to get the synthetic when he changes my oil in my car.
> >
> > Lew: Well you can't mix the 2 but this is what you need.
> >
> > Me: But if we let the oil drip out of the bike won't there still be some in there?
> >
> > Lew: No. but you need to take out the filter too.
> >
> > Me: How much do I need? And I don't think we have a filter on this.
> >
> > Lew: Yes you do and you need 2 or 3 qts.
> >
> > Me: How do I know if we need 10W 30 or 10 W 40?
> >
> > Lew: Here just stick your finger in it and see how smooth it is and you can use either one.
> > I
> > After sticking my fingers in 2 different bottles, I thought "What the heck is wrong with this guy? I am going home and ask the people on the forum." Geez! Why can't anything ever be easy?!?!
> >
> > What do I buy for oil????? Help!!!
> >
> > Julie
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw
1970-73 C70 Troubleshooting Guide:
http://tinyurl.com/6ebwtw (scroll to sec.7.1 page 101.jpg)
1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c
1980-81 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec.18-1 page 170.jpg)
1982-83 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec. 20-28 page 205.jpg)
1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn6
1982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.html
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