TOPIC:

my Saturno 500 IoM came with a NGK DPR7EA-9.

I bought a Saurno service kit which came with an NGK DP9EA-9

my bike is only 9000km from new and everthing was original including the 1988 tyres, so I suspect the plug could well be from the factory.

The IoM has a K and N pod filter instead of the airbox of the standard model. Dont know if the jetting is any different. Could this require a different heat range plug?

Initial impression after fitting the new 9 plug is the idle is not as smooth as with the 7 plug.

Any thoughts? It was certainly running very nicely with the 7 plug.........

NGK site says 500 saturno should use DPR8EA-9, so I have one of either side of that!!!!

as far as i remember the 8 is for the Saturno and the 9 for the Nordies. Or the other way round
I think there is not a big difference.
Maybe you should check after a short ride.
If you can get the same type without the 'R' use this. Less resistance leaves more power for the spark
But take care to have the 'P'

ciao Joachim

When I was having problems starting the 604 Nordwest in cold weather I went 'down' in heat range from a 9 to an 8 which helped. David Champion's FAQ suggests a 9 for both Nordwest and Saturno.

It may be that the 9 is oiling up a bit being a 'hard' plug. 7 seems a bit on the soft side to me. An 8 would be a happy medium.