Hi, I would like to replace the plugs in my 1985 K100rs and could only get my hands on the NGK D7EAR (with resistor) rather than the plug without resistance.  Does anyone see a problem using these?

jumpinjimmy thanks you in advance for your response.

The NKG D7EA is the one to use, not the DR7EA. Have a read of this thread.
https://www.k100-forum.com/t8900-new-spark-plugs

Cheers

Bosch X5DC are the originals so if you can get those probably better.

Alternatively
http://www.sparkplug-crossreference.com/convert/NGK_PN/D7EA

jumpinjimmy wrote:Hi, I would like to replace the plugs in my 1985 K100rs and could only get my hands on the NGK D7EAR (with resistor) rather than the plug without resistance.  Does anyone see a problem using these?

jumpinjimmy thanks you in advance for your response.

I would be OK with using them for a short time just to get you out of trouble, but only if they were better than the originals, and then just long enough to get a set of non-resistor plugs.

Cheers,
Bill

If using NGKs make sure you have the screw on tips.  The thin threaded tip on the NGK plugs is not compatible with the plug lead caps.

Al

jumpinjimmy wrote:Hi, I would like to replace the plugs in my 1985 K100rs and could only get my hands on the NGK D7EAR (with resistor) rather than the plug without resistance.  Does anyone see a problem using these?

jumpinjimmy thanks you in advance for your response.

Why do you wish to change?

jumpinjimmy wrote:Hi, I would like to replace the plugs in my 1985 K100rs and could only get my hands on the NGK D7EAR (with resistor) rather than the plug without resistance.  Does anyone see a problem using these?

jumpinjimmy thanks you in advance for your response.

2 things here

1. How many K's has your bike done and if it is a lot then
2. Can you be certain the Leads are original type that has the resistor built in to it or are the leads aftermarket ones needing a resistor plug?

Just thinking that's all

Maybe if you are changing plugs and your machine is high K's then new leads would be of great benefit. Also . . it is an '85 so if the leads are original then they are nearly 30 years old and could well be overdue for replacement anyway

To repsond to a few of the posts...This is a high mileage bike, 80,000 miles or more (speedo changed at some point).  The reason I would like to change the plugs is that they are at least 7 years old and the bike has been sitting for a long time.  I took out the plugs yesterday and had a look.  They are NGK D8EA plugs and they only have the threaded ends on them and not the fatter tips.  Very odd.  Not sure how they could work properly given the type of plug wires caps that are mounted.  Anyway, the plug wires are genuine BMW equipment and are most likely original to the bike, so almost 30 years old.

I'm thinking I'll go back to the original Bosch plugs and not use the NGK plugs.

Old leads can certainly cause performance problems as Be made can attest to, but imo, if they test ok, I wouldn't go to the expense. However, determining whether the leads are original resistance type and they do provide the correct resistance, would be a good idea. The thread (link I posted above) explains how to test leads and coils (thanks to RickG and others).
These are original resistor leads...


The D8EA plugs are a cooler plug, however some members report using them with no problems. Personally, I would find somewhere that can order the D7EAs in or buy them online.

You need to get the connector nut for the end. They don't come with the NKG plug.

Cheers

yep, my leads are exactly like that and stamped BMW.