![]() The plugs are fine Iridium - exactly the same as the ones I took out - the issue with plugs is that there are fakes out there and they are hard to spot - as far as I could see these were genuine by all the markers I could find, the oil is Motul 7100 15/50 FS (typo check) so oil is not an issue ![]() If in a really hot climate, some use 10w60, but I live in Australia and our summers are near 40C and I have had no issue with 10w50 Motul 5100 - I just change it every 6000kms, and my 129k km BB still refuses to burn any oil over that 6000km interval (eg 4ltrs in, 4 ltrs out after 6k kms). The rating for oils is 20w = the viscosity of the oil when dead cold (eg at startup) and the 50 is the viscosity at full operating temp, so a smaller cold start viscosity helps get oil to all the parts quicker when 1st starting the bike and the thicker rating '50' helps keep the fully hot motor happy. but any 10w50 or 15w50 oil like Motul 5100 or Motorex Top Speed is perfect for the bird - I tried Belray 20w50 semi syn once, and it was ok but felt a bit thick due to being a mineral fortified oil vs any of the latest mid strength full syn's. Someone on here should know the new NGK plug number. I don't ride my BB much anymore so the basic $26 set of non iridiums will last me 2-3 years. There is a superceding NGK # that eludes me, but an ordinary NGK CR9EH9 will fit but won't last more than the usual 12,000kms vs the 40,000 kms life of an Iridium plug.ĭon't be afraid to pay the $130 a set of 4 for Iridiums as you don't have to dig deep into the body work to change them as often, so that makes them very economical. I think the original plugs were an NGK IMRC9H, but a Denso IUH27 is compatible (I have used them before). I have worked on bikes that needed two crush washers on their plugs to keep their electrodes clear of pistons, so it can be possible the plugs are cheap knockoffs and too long. ![]() ![]() ![]() Make sure they are the correct part number as plugs come in all sorts of lengths and the wrong part # plug may be contacting the pistons and closing up the plug gaps. I'd be suspicious of the spark plugs, or something about the reassembly. ![]()
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