fastbob Posted October 20, 2020 Share Posted October 20, 2020 Couldn't wait 'till tomorrow .. So the head is off and the pistons and barrels look really good. Are you going to use a new base gasket ? Head gasket yes , but a base gasket would probably be ok. Not much oil pressure behind it and it's metal so it won't have compressed . Quote Link to comment Share on other sites More sharing options...
KiwiBob Posted October 20, 2020 Author Share Posted October 20, 2020 Couldn't wait 'till tomorrow .. So the head is off and the pistons and barrels look really good. Are you going to use a new base gasket ? Head gasket yes , but a base gasket would probably be ok. Not much oil pressure behind it and it's metal so it won't have compressed . I haven't removed the barrels and as the bores look so good and the mileage is less than 9,000 I'm going to take a risk and assume the pistons are sound too! .. If it comes back and bites me on the arse then I'll know better next time! Quote Link to comment Share on other sites More sharing options...
fastbob Posted October 20, 2020 Share Posted October 20, 2020 Couldn't wait 'till tomorrow .. So the head is off and the pistons and barrels look really good. Are you going to use a new base gasket ? Head gasket yes , but a base gasket would probably be ok. Not much oil pressure behind it and it's metal so it won't have compressed . I haven't removed the barrels and as the bores look so good and the mileage is less than 9,000 I'm going to take a risk and assume the pistons are sound too! .. If it comes back and bites me on the arse then I'll know better next time! Fair enough . There's no reason to suspect that there would be anything wrong with the barrels or pistons . What I would be concerned about is what lead to the cam follower being eroded like that . One common issue with ER5's is their tendancy to dump fuel into the sump overnight . It could be that the damage started when the bike was run with petrol diluted oil in it and once the case hardening was broken the milder steel beneath started to wear away . Or it could simply be a faulty component which would be consistent with only one of them failing and there being no damage to the other three or the camshaft . Anyway looks like you've got yourself a decent spare engine once that's fixed . Quote Link to comment Share on other sites More sharing options...
TRSCRider Posted October 21, 2020 Share Posted October 21, 2020 That's cheating ! That bike is mint . I paid £300 for this thing . She's mint! Quote Link to comment Share on other sites More sharing options...
KiwiBob Posted October 21, 2020 Author Share Posted October 21, 2020 Are you going to use a new base gasket ? Head gasket yes , but a base gasket would probably be ok. Not much oil pressure behind it and it's metal so it won't have compressed . I haven't removed the barrels and as the bores look so good and the mileage is less than 9,000 I'm going to take a risk and assume the pistons are sound too! .. If it comes back and bites me on the arse then I'll know better next time! Fair enough . There's no reason to suspect that there would be anything wrong with the barrels or pistons . What I would be concerned about is what lead to the cam follower being eroded like that . One common issue with ER5's is their tendancy to dump fuel into the sump overnight . It could be that the damage started when the bike was run with petrol diluted oil in it and once the case hardening was broken the milder steel beneath started to wear away . Or it could simply be a faulty component which would be consistent with only one of them failing and there being no damage to the other three or the camshaft . Anyway looks like you've got yourself a decent spare engine once that's fixed . I reckon its had the fuel problem .. When I bought the bike there was a recent invoice for new fuel tap, carb clean, float needles, reset float height. oil change and filter. Whether that is the cause of the damage is anybody's guess. Quote Link to comment Share on other sites More sharing options...
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