Planet Minis

Redbull77 · 10-21-2009, 10:35 PM

My mom has a classic Honda 1969 CT 70 bike. I need to change the oil on the bike &...

my question is

Is there a oil filter on this model?

What type of oil should I run & how much?

How often do I need to change the oil on this bike.

Sorry, I cant find the manuel for this bike, so please let me know

Thanks

-Jonathan

mexicanyella · 10-21-2009, 11:35 PM

The early OHC motors generally tell you what oil and what amount of oil; it should be cast in to the clutch cover, there on the engine's right side, right above the dipstick. It probably says to run 30W oil above about 40 degrees F and 20W below that temp, and to run 0.8L, or 800cc of oil.

In real life you will have to do some looking to find 20W oil, and in my '71 Z50 (same engine as yours other than the piston and cylinder diameter) I have been running 30W in the summer and 10W-30 in the winter and it's been fine. Some people run 10W-40 year round. I've had no problems with 10W-30 for years other than once it gets up around 50 degrees outside the engine smokes a lot with that thin oil in it.

This summer I ran 15W-40 oil and it worked fine, but now that it's down in the 40s at night where I live it is noticeably sludgy to kickstart when cold and slow to warm up, so it's probably time to change to winter oil again.

There is an oil filter, sort of, in the center of the clutch hub. It's sort of a centrifugal sludge trap. There's also a screen on the oil pump's pickup. Get a manual and read the procedure before attempting to clean this stuff; it requires some disassembly and it's not hard if you have the right tools and know the procedure, but don't just wing it.

Your local library might well have a manual you can check out or photocopy pages from. Anything with Z50s, CT/CL/SL/XL/ATC70s, etc. will have most or all of what you need to know.

You may already know this but just in case, when you check the oil on these things unscrew the dipstick, wipe it, then rest it on the threads without screwing it in. That's the level you want to check. If you screw it in, screw it back out and check it, you'll get a falsely high reading.

10-21-2009, 10:35 PM	#1 (permalink)
Redbull77 PM Newbie Join Date: Sep 2009 Location: Southern California Posts: 49	1969 Honda CT 70 Question My mom has a classic Honda 1969 CT 70 bike. I need to change the oil on the bike &... my question is Is there a oil filter on this model? What type of oil should I run & how much? How often do I need to change the oil on this bike. Sorry, I cant find the manuel for this bike, so please let me know Thanks -Jonathan

10-21-2009, 11:35 PM	#2 (permalink)
mexicanyella El rey de los puntos Join Date: Aug 2008 Location: Troy, MO Posts: 972	Re: 1969 Honda CT 70 Question The early OHC motors generally tell you what oil and what amount of oil; it should be cast in to the clutch cover, there on the engine's right side, right above the dipstick. It probably says to run 30W oil above about 40 degrees F and 20W below that temp, and to run 0.8L, or 800cc of oil. In real life you will have to do some looking to find 20W oil, and in my '71 Z50 (same engine as yours other than the piston and cylinder diameter) I have been running 30W in the summer and 10W-30 in the winter and it's been fine. Some people run 10W-40 year round. I've had no problems with 10W-30 for years other than once it gets up around 50 degrees outside the engine smokes a lot with that thin oil in it. This summer I ran 15W-40 oil and it worked fine, but now that it's down in the 40s at night where I live it is noticeably sludgy to kickstart when cold and slow to warm up, so it's probably time to change to winter oil again. There is an oil filter, sort of, in the center of the clutch hub. It's sort of a centrifugal sludge trap. There's also a screen on the oil pump's pickup. Get a manual and read the procedure before attempting to clean this stuff; it requires some disassembly and it's not hard if you have the right tools and know the procedure, but don't just wing it. Your local library might well have a manual you can check out or photocopy pages from. Anything with Z50s, CT/CL/SL/XL/ATC70s, etc. will have most or all of what you need to know. You may already know this but just in case, when you check the oil on these things unscrew the dipstick, wipe it, then rest it on the threads without screwing it in. That's the level you want to check. If you screw it in, screw it back out and check it, you'll get a falsely high reading.

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