okjc250 Posted March 26, 2016 Report Share Posted March 26, 2016 Mates 290 is rattling like a gooden, got a mate whos a decent mechanic who is going to help me do the rebuild What costs are we looking at for a full rebuild? not sure if its top end or bottom end? Probs end up doing it all Quote Link to comment Share on other sites More sharing options...
copemech Posted March 27, 2016 Report Share Posted March 27, 2016 Most do not need a conrod kit, which leaves main bearings and a top job with a few gaskets and seals. Quote Link to comment Share on other sites More sharing options...
okjc250 Posted March 27, 2016 Author Report Share Posted March 27, 2016 http://www.ebay.co.uk/itm/SHERCO-250-290-ENGINE-REBUILD-KIT-1-/121924423550?hash=item1c63430f7e:m:mxAaebiEwDvtQkNj0x--11Q So it should be all of that plus the little end bearing Quote Link to comment Share on other sites More sharing options...
tony27 Posted March 27, 2016 Report Share Posted March 27, 2016 Other place you can get a rattle is the clutch basket, the rubber dampers between the gear & basket shrink & go hard over time. Splatshop has a blog on their site on renewing them, total cost is 0.85pounds x8 for the rivets, 1.19pounds x8 for the rubber pieces. I replaced the basket at the same time when I did mine as it's amazingly cheap at 24.71pounds When you do the bottom end you can get the later main bearings which run seals & also get the Viton crankseals which last longer with any fuel that has ethanol in it. If a later part is a direct replacement it automatically supercedes the previous part which means anything you order should be the latest generation/upgrade Quote Link to comment Share on other sites More sharing options...
okjc250 Posted March 27, 2016 Author Report Share Posted March 27, 2016 http://pages.ebay.com/link/?nav=item.view&alt=web&id=141742613392&globalID=EBAY-GB So if we bought this for the bottom end and the seals ect what else would we need for the top end rebuild? Quote Link to comment Share on other sites More sharing options...
tony27 Posted March 28, 2016 Report Share Posted March 28, 2016 Probably piston kit if the barrel is ok. You don't need to remove the head when you rebuild it so some of those O-rings won't be needed unless you have to replate the barrel Quote Link to comment Share on other sites More sharing options...
copemech Posted March 28, 2016 Report Share Posted March 28, 2016 http://www.splatshop.co.uk/cylinder-replating-service-by-langcourt.html Quote Link to comment Share on other sites More sharing options...
okjc250 Posted March 28, 2016 Author Report Share Posted March 28, 2016 Ordered that full kit, plus little end bearing, clutch tool and fly wheel puller Will check piston and barrel when they are out see how they are Quote Link to comment Share on other sites More sharing options...
worldtrialchamp Posted March 28, 2016 Report Share Posted March 28, 2016 Probably piston kit if the barrel is ok. You don't need to remove the head when you rebuild it so some of those O-rings won't be needed unless you have to replate the barrel How can you clean and inspect cylinder and head properly if you dont remove the head Quote Link to comment Share on other sites More sharing options...
tony27 Posted March 29, 2016 Report Share Posted March 29, 2016 Everything can be done from the bottom of the cylinder, if a decent oil has been used there won't be any build up on the head Quote Link to comment Share on other sites More sharing options...
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