Topic: Spark Plug Caps

[750Dave]

Can anybody tell me if it is ok to use Resistor spark plug caps with points ignition on my CB750K3 as my son says I should only be using non resistor type cause I do not have electronic ignition, having said that I have used resistor caps and stuff on cars with points so I'm thinking should be ok..750Dave.

[dave500]

you should be using resistor caps full stop.they came from factory with them,with all due respect tell your son hes a retard!

[DaveBarbier]

Yes to caps, no, your son isn't a retard.

We don’t actually know the level of his son’s IQ. I’m willing to hold off on assumptions until we see evidence to the contrary.

[DaveBarbier]

Yes to caps, no, your son isn't a retard.

We don’t actually know the level of his son’s IQ. I’m willing to hold off on assumptions until we see evidence to the contrary.

Easy there...

Haha, just playing around.

To the OP. I’ve always heard with stock coils you want to get 5k ohms plug caps or 5k ohm resister plugs without resistor caps.

[TwoTired]

For the 750 5k ohm caps is recomended and factory stock for US models.  Although some models (Canadian) came with 5k caps AND resistor spark plugs.

The resistors wave shape the spark impulse signal.  This does two things beneficial.  One, it reduces radiated emission radio frequency interference from the spark lead wires.  And two, it simultaneously lengthens the spark event duration, which it good for combustion reasons.

Cheers,

[PeWe]

I have not found caps with 0 ohm that fit the bike except for my old orange silicone caps I have in the garage.  Should be OK with resistor plugs.
The NGK 5 kOhm caps look and work really good with NGK D8EA plugs, cu wires.

[750Dave]

Thanks for the info, my son is not a retard he's only thinking that the resistor type may be a problem when running points..750Dave.

[Deltarider]

For the 750 5k ohm caps is recomended and factory stock for US models.  Although some models (Canadian) came with 5k caps AND resistor spark plugs.

The resistors wave shape the spark impulse signal.  This does two things beneficial.  One, it reduces radiated emission radio frequency interference from the spark lead wires.  And two, it simultaneously lengthens the spark event duration, which it good for combustion reasons.

Cheers,

The latter part of TT's remark is an hypothesis. It's his and has remained unproven. In the first part he's undoubtedly right and a resistance (normally between 5 and 7kΩ) is also good to prevent premature erosion at the sparkplug's electrodes. Honda France suggests (documented) not to have more than 8kΩ in total and that goes for any CB Four model. That's all we know for a fact. Canada may have had stricter rules. We don't know. I don't have good results with resistor spark plugs. On my desk the four X24ESR-U that were fitted for not even 7000 km. Here are the readings in kΩ: 7,8  7,9  6,9 and  8,5. They were not even 5kΩ when new, so resistance has increased considerably. I was warned by the dealer not to use them, but I, stubbornly had to put it to the test. Some people think resistance is something special when it's in a trivial electronic component like a resistor. I'm not one of them. My conclusion: stay away from R(esistor)plugs and forget about unproven claims.