When I didnt know the importance of regular oil change, two or three times i paid dearly by having piston and everything changed due to excessive wear. A stitch in time saves nine.
Be regular, more frequent, using cheap oil is just fine, choose thicker oil in summer and thinner in winter. Regularity will increase engine life more than anything else.
I must stop myself now.
--- In Honda-C70@yahoogroups.com, "A" <ak6666666@...> wrote:
>
> 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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