rebuild

[cooldude3552000]

I am going to rebuild the engine in my 92 yamaha wr200(2 stroke). I am just waiting for the wiseco piston kit to come in the mail and for the gasket set to come in from the dealer.

This is my first time rebuilding a dirt bike engine(actually any engine). Does anyone have any tips for me? I have a repair manual and am pretty good mechanicly and have had experience taking apart small engines(like ones out of a small scooter).

Also what is a good way to break in the new piston/rings. I have read all sorts of way on line and wanted to know what the best is. This is not a race bike, just a bike for recreation()is that has anything to do with how I break it in?

Thanks!

 

[BSWIFT]

Do 2 or 3 heat cycles and should be fine on break in. Follow the manual for your rebuild and you'll be good to go. Have fun.

 

[cooldude3552000]

how long are the heat cycles and how long do i let it cool? Also how fast should I ride it?

Anyone have any tips for rebuilding it that the manual doesn't say?

 

[BSWIFT]

Heat cycles are bringing the engine up to normal operating temperature. Should only take 3-4 mins tops. Let the engine cool completely. Check your plug, it will likely be pretty oily looking. Replace with a new plug if it fouls then let her rip.

 

[KdxChode]

I have always heard that it's ok to rev it a little during break-in too. You just don't want to stress the motor by putting heavy loads on it (such as lugging it in a high gear or going full throttle). Just take it easy for a few heat/cool cycles like BSWIFT said and you will probably be set for many more years of recreation riding. Does it still have the original piston in it?

 

[cooldude3552000]

I don't know, I have owned it for a year, the guy I bought it from owned it for about a year and I know that he never rebuilt it and I haven't rebuilt yet.