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. Customers who wish to cancel any order must notify Boost Performance by email by 10am on the next business day following the date of order.I'd be suspicious of the spark plugs, or something about the reassembly.

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