Saludos, existe alguna diferencia con la dcpr7ea-9?

Si. mientras el número sube.es más fría la bujía y mientras baja es más caliente.no todas las moto llevan el mismo calibre.

Other than these plugs are there any better

Not sure if there are better plugs but probably some that are just as good. Honda and most Japanese manufacturers use NGK as original plugs in many cars and motorcycles. I bought them for my Honda Goldwing and they are great in my opinion.

Will this fit 1989 goldwing?

Yes, the NGK Spark Plug DPR7EA-9 is compatible with a 1989 Goldwing.

will a 2004 yamaha vstar 650 use this plug

I doubt it, but I could be wrong. I bought some for my 02 Honda shadow 750, and haven't used them yet because they're for colder weather riding. Best way to find out is Google "2004 Yamaha V-star 650 specs." You should find a list of the complete specifications, and just look for the spark plug type. They'll usually list 3-4 different brands of spark plugs that will work.

ASIN	B00M5EVB2K
Amazon Bestseller	#20,784 in Automotive ( See Top 100 in Automotive ) #158 in Automotive Replacement Spark Plugs
Brand	NGK
Customer Reviews	4.7 4.7 out of 5 stars (1,672)
Date First Available	September 27, 2014
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	25 x 25 x 25 mm
Item Weight	159 g
Item model number	5129
Manufacturer	NGK
Model	4 pack NGK Standard 5129 Spark Plug
Position	Front, Rear
Product Dimensions	2.54 x 2.54 x 2.54 cm; 159 g

NGK Spark Plugs DPR7EA-9 - Set of 4

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