I have my cylinder head off my XS at the moment, it needed new valve stem seals. I am hoping to get some opinions on what work I should carry out while the head is off. The engine has 104,000 miles on it, and was running well apart from being smokey when starting and under hard acceleration. My original plan was to lap the valves, replace all the gaskets, and oil stem seals.
Having tried to clean up the cylinder face I am unable to get it spotless, ive done some more reading it seems I should probably skim the head anyway, although its not conclusive. I would rather avoid spending money pointlessly but if its generally considered to be the right way to go I would rather get it skimmed, any opinions welcome.
Some of the exhaust valves where coked up on the stem, one of them refused to spin round while lapping, I gave it a good clean and lapped it in but I think it might be time to replace the exhaust valves (quite cheap on ebay) does replacing the valves mean I should also be getting the seats re-cut? It was my first attempt at lapping valve and after about 5 minutes on each one with a fine paste they are looking ok although some are still a bit pitted.
Should I be thinking about replacing the valve stem as well? I think these are still available from peugeot.
Should I replace the valve springs even if they are all the same length?
My aim is to make it reliable and feel confident driving it hard.
Sorry for the poorly worded questions, hopefully someone can help, not really sure on the life expectancy of these parts in a TU engine,