Anyone with a '99 do a top end yet?
Posted March 16, 2002 - 11:58 AM
I can check and replace valves myself but I don't have the time, tools or know how to do a complete top end (rings, piston if needed, etc.). So I'm wondering if I need to shell out the 500 to 600 bucks to get it done or should I wait until I see smoke?
What is going to be the performance benefit with a revamped top end?
Posted March 16, 2002 - 02:31 PM
You will see increased compression, crisper response, more power everywhere.
The easiest way to find out your top end condition is to check your compression. Find out what a new top end compression is to compare it to. A low compression means either valve leakage or rings. If you pour a couple tablespoons of oil down your sparkplug hole, and kick her over a couple times w/ the compression tester installed, you can determine rings or valves. If compression goes up, it's your rings. If it stays the same, it's your valves.
Top ends are very easy to do, but you will have to remove your entire valve train (head), and cam chain. This WILL require you to align the cams ALL OVER AGAIN.
Find someone who has done 4 stroke tops ends before to help. Don't try it by yourself. You'll need someone to help compress the rings when you are slipping your cylinder over the piston.
Also, when your cylinder is off, you can inspect your cylinder walls. There should be no scoring. The finish should be uniform throughout.
The first time is always the hardest. It is time to break that top end hyman, Doug!!
Posted March 17, 2002 - 12:11 AM
i would say that you only need do the rings usually.
if you race it should get new rings for each season.
Posted March 17, 2002 - 03:27 AM
Posted March 17, 2002 - 06:34 AM
My point is, if it is still running good, then Im with Yamakaze, leave it.
Posted March 18, 2002 - 03:51 AM
Posted March 18, 2002 - 04:13 AM
i ordered the bits,,
took the top end off,,,
the piston and rings i took out where in pretty much perfect condition.
Posted March 18, 2002 - 06:39 AM
Hence checking the compression first.
Posted March 18, 2002 - 07:06 PM