hi,

has anyone heard of denso x24 epu or x24 epru as being fit for the K100 (1987)?

seems they are very prevalant here while the NGK D7EA or champion A85yc or BERU 12-5 DU are hard to get.

Has anyone any experience with DENSO? is it a reputable aftermarket supplier or a cheap replacment?

thank you,
Roy

Hi Roy,

Can't see you having any problems with Denso plugs although I have not used them personally.

K100 should use X22ES-U or in the Iridium IX22 with a 0.5mm gap.

Regards,

Phil

Resistor plugs are supposedly for the K1100 I believe but I have Bosch resistor plugs in mine with no ill effects as that was all I could get at the time and was told they would be ok.

We need some input from our more learned colleagues as to the differences and why they are used.

Regards,

Phil

You can have resistor plugs with zero resistance caps such as in the 16v K's and most modern stuff or you can have non-resistor plugs with resistance cap as with the 8v K's and airheads.

If you have resistor plugs with resistor caps, you may notice slightly harder starting, an increase in fuel consumption or poor idling, but it will not cause any damage.

If you use non-resistor plugs with zero resistance caps as found on the 16v engines you could run into problems. The resistors in either the plugs or caps are there to prevent RF interference which can damage electronic componants such as tachos and Hall effect ignition units. Can make your radio noisy too, if you have one.

Bosch have stopped production of non-resistor plugs and state that its ok to use resistor plugs in older engines. Strictly speaking, they are correct but I would prefer to use the correct plug from another reputable company such as NGK.
Resistor plugs usually have an 'R' somewhere in the model number.