Pete Merritt Posted September 20, 2021 Share Posted September 20, 2021 My 1991 xflow puffs blue smoke when started hot. I live in Bournemouth and suspect there’s engine work to be done. Any advice and recommendations greatly appreciated. Link to comment Share on other sites More sharing options...
Area Representative jonsymons Posted September 20, 2021 Area Representative Share Posted September 20, 2021 Pete - worth doing an oil change to something like a Millers 20/50 Pistoneeze? Won't fix anything mechanical but might at least put off the expense for a while... Link to comment Share on other sites More sharing options...
Wrightpayne Posted September 20, 2021 Share Posted September 20, 2021 Do they have valve guide oil seals? Link to comment Share on other sites More sharing options...
Englishmaninwales Posted September 22, 2021 Share Posted September 22, 2021 Or even Millers 20/60, it reduced the smoke at start up on my twin cam, putting off the new valve guides for a bit. Link to comment Share on other sites More sharing options...
AnkerB-S Posted September 22, 2021 Share Posted September 22, 2021 The original valve seals are junk. Burton Power has better seals and they are easy to change once the cylinder head is off. There are two sizes and Burton can help you figure out which size is the right one for you.A compression and leak down test should be done first. Link to comment Share on other sites More sharing options...
Beagler Posted September 22, 2021 Share Posted September 22, 2021 If bore wear is not too bad we used to fit 2.5 or 5 thou oversized pistons. They were lapped in upside down with a handled flat steel attached to gudgeon pin. Engine In situ .We used Ajax and oil. The engine was quite tight on startup but if they were run at intervals carefully on idle till they freed up a little they were cracking engines and lasted. what mileage has the engine done. Link to comment Share on other sites More sharing options...
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