top end rebuild

[dunvegan8]

hi folks i,m thinking of attempting a top end rebuild on my 90 xup 1000 , anyone got any tips or advice before i run into trouble <br> cheers<!--EZCODE EMOTICON START :rollin --><img src=http://www.ezboard.com/images/emoticons/roll.gif ALT=":rollin"><!--EZCODE EMOTICON END--> <p></p><i></i>

[dragracer1951]

Sure....If you are not going to remove any of the valves ... do not split the upper head...and do not turn it upside down without mapping the valve shims first.<br>Remove the cma chain tensioner and the exhause cam comes out first.<br>Have a look at all of your valves and seats as there is a tendancy for the early valves to be soft<br><br> <p>Jim <!--EZCODE IMAGE START--><img src="http://img.photobucket.com/albums/v209/ ... Cheers.gif" style="border:0;"/><!--EZCODE IMAGE END--><br><br><!--EZCODE IMAGE START--><img src="http://img.photobucket.com/albums/v209/ ... states.gif" style="border:0;"/><!--EZCODE IMAGE END--><br>Hey Kid...Is my taillight working?</p><i></i>

[dunvegan8]

cheers dragracer <br> i am gonna take the valves out to replace the oil seals. any idea how long it will takefor the complete jog <p></p><i></i>

[dragracer1951]

With the engine out of the frame I can have it to the bare crank in a couple of hours. The head will take a bit of time if you require valve work as you will need to clean it up and lap the valves in and then clean it up again...<br>I measure and map the shims before taking it apart so I know where everything goes. then I lap everything and reassemble and remeasure before I put the head back on...Just make sure you're on the base circle and you'll be fine<br>Don't forget to look at the valve to guide clearance and be carefull installing the new guide seals...<br> <p>Jim <!--EZCODE IMAGE START--><img src="http://img.photobucket.com/albums/v209/ ... Cheers.gif" style="border:0;"/><!--EZCODE IMAGE END--><br><br><!--EZCODE IMAGE START--><img src="http://img.photobucket.com/albums/v209/ ... states.gif" style="border:0;"/><!--EZCODE IMAGE END--><br>Hey Kid...Is my taillight working?</p><i></i>