How to disassemble clean & reassemble a RM80 Exhaust valve

All about your top end :-)
Post Reply
User avatar
Sandblaster
Posts: 6313
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

How to disassemble clean & reassemble a RM80 Exhaust valve

Post by Sandblaster » Tue Jun 12, 2012 10:36 pm

How to disassemble clean and reassemble a RM80 Exhaust valve.
This topic is not to show you how to do every last step on rebuilding your top end.
It is just a quick overview of what you can expect to find when you get into the exhaust valve.
A lot of guys put a new piston and ring set in their bike completely ignoring the exhaust valve.
However, there are a lot of hidden ponies waiting to be unleashed if you take the time to clean your exhaust valve assembly up.
After removing your cylinder and head, this is what your valve set up looks like:
Image

Image

Here's some more pics with the valves push up:
Image

Image

We started by removing the set screw in the middle:
Image

Next we removed the two left side retainer bolts and the pulled the cover straight out:
Image

Now, unhook the spring first and then slide the shaft out to the left:
Image

With the shaft removed you can now remove the two retaining bolts.
They generally come out fairly hard so you will probably need to use a impact screw driver.
Once this is done you can pull the center bar up and slide the valves out toward the front of the cylinder.
Depending on how dirty they are they might require some effort to get them out.
I had to push from the inside and pull from the outside.
A good soaking in some carb cleaner, penetrating oil, ect is a good idea.

Here is a view of the shaft out of the cylinder and assembled as it sits in the cylinder:
Image

Now, CLEAN CLEAN CLEAN!
Remember, the cleaner the valves go back in, the more power you make ;)
Once it is clean, reassemble in the reverse order and you are ready to go.
Remember, this information is provided free of charge and is not intended as a replacement for the directions in your manual.
ALWAYS consult your manual before you start a job like this.
I hope you found this info useful.
Feel free to comment and post your own thoughts.
If bikes are for kids I'll never grow up.

Post Reply

Return to “Top End”

Who is online

Users browsing this forum: No registered users and 12 guests