Sign in to follow this  
Followers 0
yzrider

TDC question

4 posts in this topic

I read in MXA that it's a good idea to bring the piston to TDC after you shut it off, so it closes the valves. My question is how do you bring it to TDC ? Do you just need to kick the engine through to the hard spot and pull in the compression release lever and kick it through the additional 1/4 inch or ? Thanks for your help.

Share this post


Link to post
Share on other sites

Once you get to that hard spot, you are at compression....all valves are closed, which is what you want. Stop there and you're good.

Share this post


Link to post
Share on other sites

A friend of mine made a good point on this subject. He said that our bikes generally stop at TDC when you kill them so making a point of doing this is not that big of an issue. Generally I think he is right.

Share this post


Link to post
Share on other sites

Paul: Generally...that is what I have found. But, since I am a FANATIC about putting my engine at TDC EVERYTIME I kill the engine, I've discovered that it doesn't always end up at TDC. Apparently, sometimes, the piston hits the compression and then bounces back a few degrees of crank rotation so that you end up at somewhere between exhaust and compression. At 12.5:1 compression, there is quite a resistance if the inertia doesn't carry the piston thru compression. The compression really acts as a spring. I agree that MOST of the time, the piston ends up at TDC.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0