You can find these at your preferred store once you know the numbers (these are NGK numbers only):
Front (precat) part number OZA531-GM6
Rear (postcat) part number OZA531-GM3
For example:
precat
http://www.amazon.co...6/dp/B0096COXNS
postcat
http://www.amazon.co...3/dp/B0096COWY8
If you would purchase oem's at your local speedster garage, they would charge you about 250 euro each.
Only above NGK's and the oem's have proven to be good.
In order not to purchase unneeded stuff, it will help you in the future to be able to read the codes the eml throws. (and reset if needed)
There are various devices for this, but a simple one that does not even require batteries is this one:
http://cgi.ebay.co.u...em=281087741469
Read the code, and we will be able to tell you if you need to buy the pre or post cat lambda.
This is where the dutch and belgian speedsters hang out:
http://www.speedsterclub.nl/forum/
Edited by smiley, 27 August 2014 - 11:41 AM.