OK
You said you cleaned the oil filter, as in singular!!
Did you take the clutch cover off and clean inside the clutch outer basket?
Your best bet is to leave the rest of the engine alone, put it back together.
Make sure you hone the cylinder to reset the ring best to measure the bore and
if it is within limits go with new rings, if out of limits, rebore to oversize.
What ever you do, you must study the parts book before you buy anything!!!!!
A C70 is not a C70, Honda changed designs back and forth so you must make sure
the part someone says is for a C70 is the right part for YOUR C70.
As for flushing out the engine. If you are worried, get the engine back together
run it till it is hot, make sure you do the correct set up and break in, then change the oil.
Do that a few times every 100 to 300 miles, that will flush the engine.
Make sure you use the correct oil. There is like only one car oil that will not cause problems
with the clutch. be safe buy motorcycle oil.
If after all this and the transmission is bad, well then you dive in and do a full rebuild.
The nice thing about this design, you can pull the head off and slide the cylinder off just
enoght to remove the wrist pin and leave the piston in the cylinder and not have to worry about
re seting the rings if you do have to split the case.
Bill
Portland OR
________________________________
From: Sean <seanrouzbeh@gmail.com>
To: Honda-C70@yahoogroups.com
Sent: Friday, June 1, 2012 10:17 AM
Subject: [Honda-C70] 1981 C70 Restoration
Need advice...
I am restoring a barn find C70. Engine turns and I believe it has compression. I have cleaned the carb but need new o-rings all around.
I have taken of the right Crankase cover and found sludge on the bottom. I have cleaned most of it out, cleaned the filter, and cleaned the pump. Should I remove further parts here to get to more hidden sludge?
I have also taken off the cylinder head down to the piston and the taken the piston off. Since I am this far in is there anything I should do now before I replace gaskets and tighten everything back up? I am planing on replacing the piston rings.
The valves look rusty and the combustion chamber has much carbon build up. Should I dip everything in a parts cleaner?
Should I go into the transmission or should I leave that for if it aint broke dont fix it?
I am looking for the following parts...I can find most of them on the internet but I am looking for reliable sources.
81 Engine Gasket kit
Carb Kit
Keys
Seat
Piston Rings
Mirrors
Kick Start Rubber cover
Battery holder/strap
Tensioner Plug
Thanks everyone
[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
