Yep same here, that has pi$$ed me off a few times before. Why would they make the 900 need a special plug. I bought 6 when I found them so I'm good for a while.

 

Sometimes if you ask for the NGK 3901 they have it listed by that number instead of the CPR7ea-9

 

Bought 4 on ebay. Have 2 waiting for the next change. They only cost me like $2-3 bucks each.

 

WOW I got over 33K on mine and all I have done is clean and readjust them. They still look fine. Anybody try the "gap less" plugs. The ones that have like a ring around the outside it fires to?

 

Just put the plugs in my 900.......HOLY CRAP WHAT A DIFFERENCE!!!! It's a whole new bike!

 

Motorcycle Spark Plug Cross Reference

 

Found the plug for the 900------nothing cross references

 

Really strange! What if the plugs became impossible to get? Park the bike?

 

We buy Harleys!

 

Well I've done like 12 hours of research on plugs in last couple days. Sometimes it comes up with a cross refference sometimes not. I found some of the manufactures site will let you look the bike up but some only give cages. So what I have found is
Denso= IW22 or a U22ESR-N
Bosch=UR22C
E3=E3.38
Autolite=4303 or XS4303 (xtreme sport)

 

Just put the plugs in my 900.......HOLY CRAP WHAT A DIFFERENCE!!!! It's a whole new bike!

Yeah, if the change is overdue, big BIG difference. Matter of fact, I just did mine this morning on my 800B.

I tend not to change them until the engine starts giving signs that it's past time to do it. I never wrote down the mileage, but if memory serves, I never got more than 20,000 miles from a set of plugs in any of my motorcycles.

I wonder what your experience is on this?

 

Numbering system for NGK's

NGK Spark Plugs USA


I would confirm the information by measuring and you should be able to build your own suitable substitute cross reference based on thread diameter, reach, heat range and other characteristics.

edit: CPR7EA-9 = 10mm thread, 5/8" hex, projecting center insulation, resistor, slightly hotter than mid-range, 3/4" reach, special electrode construction (may or may not be important to function), 0.036 gap. You'll have to look at plug wire end and seat but my guess is there are many automotive plugs that will substitute.

 

Djh3=WOW I got over 33K on mine and all I have done is clean and readjust them. They still look fine. Anybody try the "gap less" plugs. The ones that have like a ring around the outside it fires to?


These are referred to as "surface gap plugs" and are recommended for high energy electronic ignition systems only. Outboard motors have used them for 30 years now.

 

Yea OK. I guess different types of use's different names or something. Aircraft recip engines have used them a long time too. WE had simular "plugs" in jet engines and they were called igniter plugs. Still did same thing, lite fuel. But anyways you all know what I mean thats what counts. lol Anyways went to local parts stores today advance and autozone, only plug I could get was either the E3 or Autolite. I went with the Autolite and I will give it a try. Funny the NGK which is a cooper plug was $7.50 ea @ AZ and would have to order, the autolite was in stock and was $2.00. What the heck is up with that, most of the platnum plugs run $7. Geeze NGK explain that one.

 

Yeah, if the change is overdue, big BIG difference. Matter of fact, I just did mine this morning on my 800B.

I tend not to change them until the engine starts giving signs that it's past time to do it. I never wrote down the mileage, but if memory serves, I never got more than 20,000 miles from a set of plugs in any of my motorcycles.

I wonder what your experience is on this?

My experience with what? My engine had a fairy serious hesitation when cold, and it wasnt accelerating like it used to. I tried fuel injection cleaner, tried high test fuel, nothing did any good. Spark plugs fixed it...

 

I use iridium plugs in my celica and Ive never had to replace plugs in my bike...Ive always gottem them with new plugs and sell before I need to change them

 

My experience with what? My engine had a fairy serious hesitation when cold, and it wasnt accelerating like it used to. I tried fuel injection cleaner, tried high test fuel, nothing did any good. Spark plugs fixed it...

Sorry I wasn't clear.

I meant how many miles do you typically get out of a set of spark plugs, and it was for anyone who cares to respond.

 

On my car, every 100,000 miles. On an outboard, almost never so I change them when I feel like it. On my snowmobile, every couple of years. My bike has been parked for 20 years and the plugs look fine after 12,000 miles.