krazyosucowboy Posted April 26, 2013 Report Share Posted April 26, 2013 Standard plug is NGK cr6...something, is there an Iridium plug that crosses over? I've had really good luck with Iridium plugs in other 4t dirt bikes. Quote Link to comment Share on other sites More sharing options...
sando994 Posted April 26, 2013 Report Share Posted April 26, 2013 Go on the NGK website and put in the bike details and it will show if there is an iridium equivalent available. Quote Link to comment Share on other sites More sharing options...
chuck4788 Posted June 28, 2013 Report Share Posted June 28, 2013 CR6EH-9 plug ot the 4RT is also common on a lot of other engines. Irridium equivalent would be: CR6EIX-9 or CR6EIA-9 ($8.89 + free shipping at Amazon.com http://www.amazon.com/NGK-CR6EIA-9-Iridium-Spark-Plug/dp/B001RLOE8U) Some of the quad guys go one heat range hotter: CR7EIX-9, they claim better idle, starting, and running. Snow machines are also using this plug. Quote Link to comment Share on other sites More sharing options...
krazyosucowboy Posted June 28, 2013 Author Report Share Posted June 28, 2013 Thanks. Quote Link to comment Share on other sites More sharing options...
guys Posted June 28, 2013 Report Share Posted June 28, 2013 My trial shop advised me to use the standard CR6EH-9 in the summer and when it's below 10°C to use the CR5EH-9. And my 4RT starts and runs always fine. I would not use the CR7EIX-9, unless it's very hot or you are riding a lot at high speeds...A trials bike is no quad... Quote Link to comment Share on other sites More sharing options...
rich delaney Posted June 29, 2013 Report Share Posted June 29, 2013 You should try the E3 plug, I'm convinced that it has prevented some of the stalls I used to have. I actually had the engine momentarily stall and restart, like a 2 stroke will do. I didn't think that was possible with a 4 stroke, but it happened twice since using the E3 plug. The 4RT uses the E3.38 plug. I've had the same plug for 2 years now. Cheaper too... Quote Link to comment Share on other sites More sharing options...
mud400 Posted August 29, 2013 Report Share Posted August 29, 2013 You should try the E3 plug, I'm convinced that it has prevented some of the stalls I used to have. I actually had the engine momentarily stall and restart, like a 2 stroke will do. I didn't think that was possible with a 4 stroke, but it happened twice since using the E3 plug. The 4RT uses the E3.38 plug. I've had the same plug for 2 years now. Cheaper too... I just pick up an E3 to give it a shot. Do you know what gap you are running? Quote Link to comment Share on other sites More sharing options...
rich delaney Posted August 29, 2013 Report Share Posted August 29, 2013 I use the pre-gapped plug as is, works great! Quote Link to comment Share on other sites More sharing options...
mud400 Posted August 30, 2013 Report Share Posted August 30, 2013 I use the pre-gapped plug as is, works great! Perfect! Thanks! Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted August 30, 2013 Report Share Posted August 30, 2013 When I had my 4rt I used the standard plug but did change it fairly often. Quote Link to comment Share on other sites More sharing options...
rich delaney Posted August 30, 2013 Report Share Posted August 30, 2013 My son and I have used the E3 plug in our 4RT's for several years without any issue. I have the same plug installed for over 2 years now... Quote Link to comment Share on other sites More sharing options...
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