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The figure 7 represents the heat range of the plug. Usually it is unwise to deviate from specifications unless problems force choosing a different heat range. If the spark plug regularly fouls then a hotter spark plug could improve the problem - with NGK that would mean moving from 5 to 4.
Any move must be made with care to avoid the engine damage possible if the spark plug is too hot.
Hot and cold plugs, incidentally, indicate the amount of heat the spark plug dissipates from the centre to the body and doesn't affect the temperature of the engine. Broadly cool running engines need hot spark plugs and hot running engines need cold plugs so in each case the spark plug nose will achieve the self-cleaning temperature without becoming too heated.
Moving from a 5 heat range to a 7 (NGK) is moving to a colder plug so yes it will run fine, at least for a while, though you could find plug fouling might be a problem...
if it has chrome covers on it, just remove the securing bolts and you can remove chrome covers then remove plugs. make sure the plug colour is right you may ned a hotter running plug. NGK DPR8EA
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k r = resistor b=thread size = 14mm z 7 = heat range - NGK, the lower the number the hotter the plug. Other mfg. are opposite - higher number=hotter h = thread length =1/2"
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These are THE important ones... the rest are mfg. specifics
Hi the ntv deauville uses NGK DPR8EA-9 or DENSO X24EPR-U9. Which are all the same size plug, T he gap size is 0.8-0.9. the champion equivelent is RA4HC, you may find the different makes of plug use a diff hex for socket size, if you have a diff thread size then at sometime or other 1 thread has been damaged and re taped to fit. A larger plug size
32 to 1 is the standard mix. That is 4 ounces two stroke ENGINE oil per gallon. The brand doesn't really matter. Don't use MOTOR oil in the gas. The stock plug is NGK brand, R6918B-9. I would suggest a hotter plug, R7376-8. The last digit is the heat range. The lower the number, the hotter the plug.
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