GS450 1981 Spark plug caps

Diptenkrom

New Member
I have been "rehabilitating" this 81 GS450, and i noticed that the spark plug caps are in bad shape. I can't seem to find the spec for them anywhere. are they resistor type? does anyone know what level of resistance? they seem to be common in 1/5/10 ohm levels. any help would be appreciated, as a google search just brought up nonsense and generic ends. I plan on getting NGK, but not sure which ones are proper.
 

pidjones

Over 1,000 Posts
If you run resistor pkugs, you don't need (or want) resistor caps. I know that on mt RD400c, non-resistor plugs are getting scarce so I plan to switch over to non-resistor caps when only resistor plugs are available. 5k is the most common. But, you only want one - the plug or the cap - to be resistor. You can replace the resistor in many NGK caps with a short piece of solid copper wire or tubing to turn them into non-resistor. And, definitely do not run resistive plug wires - only solid core wire.
 

gt alex

Been Around the Block
My sv650 caps where about 10k from memory but the inside unscrews and the resistor can be swapped. I used some silver solder rod to convert to non resistive, and used some solid core wire from the local dirt bike shop.
 

Diptenkrom

New Member
thanks for the help, the plugs are resistor type, so i ordered non resistor caps. makes no sense that most plugs are resistor, and most caps are resistor as well...
 

pidjones

Over 1,000 Posts
Not certain, but I believe that years ago most plugs were non-resistor. Plug manufactures wish to reduce the number of older plugs they have to produce and stock (since new engines are requiring new specialized plugs - check the ones for a 1330cc ROTAX). So, they cut out some of the non-resistor plugs that are duplicated by resistor type because the customer can just bypass the resistors in the caps.
 

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