CTX 1300 Forum banner
1 - 20 of 24 Posts

·
Registered
Joined
·
10 Posts
Discussion Starter · #1 ·
I know a number of members have tested these spark plugs but I have not seen any recent "longer term" test results.

Any recommendations from those who use these spark plugs?

For info, Advance Auto Parts has the E3.38 plugs for only $5.99 and a $3 rebate (until Aug 29).

Thanks for your updates.
 

·
Premium Member
Joined
·
389 Posts
I know a number of members have tested these spark plugs but I have not seen any recent "longer term" test results.

Any recommendations from those who use these spark plugs?

For info, Advance Auto Parts has the E3.38 plugs for only $5.99 and a $3 rebate (until Aug 29).

Thanks for your updates.
J
I had Iridium plugs fitted in March , last major service .. its starts quicker , runs smoother , not sure about fuel savings.. but I did notice a performance improvement ... not earth shattering , but noticeable ...
 

·
Registered
Joined
·
10 Posts
Discussion Starter · #3 ·
Thanks Russ, I appreciate your feedback.

Hopefully we can hear from others to confirm their experiences.

I would also like to know if there are any negative experiences with these plugs e.g. over heating and bluing of pipes, misfires, etc.

best regards
 

·
Premium Member
Joined
·
389 Posts
Big Red ... none at this stage .. no issues only compliments .. If they continue to perform as they are , I will keep installing them each service ...
 

·
Registered
Joined
·
10 Posts
Discussion Starter · #5 ·
Update on the E3.38 plugs - I just returned from a 3-day, 1,040 mile trip to Mt Rainier, Mt St Helens and into the desert at Yakima then home to Vancouver BC.

Bike ran great, as always, averaging 55.70 miles per gallon - even going up the mountains and across all the passes. The bike was even staying above 50 mpg going up some fairly steep hills although I do not push the bike when going up unless it becomes too steep then I will even downshift which normally is not needed with this machine. I was quite impressed.

The bike was so smooth with the new plugs (not sure if it is the E3's or just new spark plugs although the "old" ones only had 9,000 miles on them).

I will keep an eye on these new plugs to update everyone if I find any further differences.
 

·
Registered
Joined
·
668 Posts
Well, I hope the E3.38’s are good. Gonna install a set later this evening - and change the diff fluid. 12,872 miles.
 
  • Like
Reactions: Stlburd2

·
Registered
Joined
·
668 Posts
Well, just over a month and over 6,000 miles later (!!!), the E3.38’s seem to be doing well. No change in performance, as far as I can tell. I do know that I can average +/- 41mpg on the freeways running between 74-79mph, and get 200 miles to a tank at those speeds.
 
  • Like
Reactions: Blue Baron

·
Premium Member
Joined
·
26 Posts
Can someone help me out? Whenever I look at the E3.38 plugs and check to make sure they fit my bike, I get a message that they don't. Not sure if the site just doesn't know or if I need to look in a different place. I want to change plugs before next summer. I have noticed that I don't seem to get the same miles out of a tank and feel some roughness at idle so am thinking new plugs. Thanks.
 

·
Super Moderator
Joined
·
5,724 Posts
Lots of generic parts like that don't show as being a fit for the CTX1300. When I was searching for a battery I found the exact OEM battery on Amazon. It was listed as not compatible even though it was the exact same Yuasa model number, size, and all other specs. Even the same color! :D When I looked up a different battery that is not OEM for ANY bike or vehicle it actually showed that it WAS compatible and fit. Parts suppliers, regardless who, don't always have their information right. I'd go with those who tried the same part and can attest to the fit.
 

·
Premium Member
Joined
·
1,072 Posts
Lots of generic parts like that don't show as being a fit for the CTX1300. When I was searching for a battery I found the exact OEM battery on Amazon. It was listed as not compatible even though it was the exact same Yuasa model number, size, and all other specs. Even the same color! :D When I looked up a different battery that is not OEM for ANY bike or vehicle it actually showed that it WAS compatible and fit. Parts suppliers, regardless who, don't always have their information right. I'd go with those who tried the same part and can attest to the fit.
Wait a minute. Does that battery come in RED? 'Cause RED is the fastest color!
 

·
Registered
Joined
·
668 Posts
Sorry to hear that. With my change to E3.38’s - over 9,000 miles with no issues.

‘Best’ may be subjective ...
 

·
Registered
Joined
·
679 Posts
The best spark plug is NGK CR8EHIX9..After 500 Miles no issues.

The BEST?! That is a strong statement for sure. It does seem to perform well, but actual data supporting the claim is limited.



Also known as NGK CR8EHIX9UG39 and previously documented in the knowledge sharing document.
 

·
Registered
Joined
·
39 Posts
One of the first mods I did to my CTX when i purchased it back in 2015 was put iridium plugs in.
No question about the improved performance. Instantaneous power, beyond what the engine design has. For me, the real tell tale is that you can do wheelies just by hitting the throttle, no clutch is needed. I can not attest to any better fuel economy, quicker starts, or smoother engine. But the power is there before you think of it. I have had the machine for four years this spring, and it still had that snap before I parked it at Halloween after changing out the K & N air filter and Pirelli tires. Fuel economy is anywhere from 15-17 Km per liter, and it has been in that range since day one.
I have used Iridium in my previous Shadow as well, again, noticeable performance improvement.
I have been using them for years now, in all my vehicles, and glad to say, NGK finally put some out that I could use in my Intrepid, again, Boom, she books.
 

·
Premium Member
Joined
·
605 Posts
For me, the real tell tale is that you can do wheelies just by hitting the throttle...
Power wheelies? Really? I'm not doubting you as I would never question a fellow member. I just never thought of power wheelies with the CTX. My 1000R power wheelies and I always do so when leaving a light if there happen to be any Harleys around. It's a character defect I know and I should be in therapy to be certain. I try to cope without. :smileygarden_de_ban
 

·
Registered
Joined
·
679 Posts
After less than 100 miles they caused a misfire...I suspect they are wrong heat range...cold.

I think you are correct about incorrect hotness of the plug. It seems E3 has a SINGLE replacement for 3 different plug hottness as seen on their website.

E3 website said:
E3.38 is a 10mm, 0.750” reach plug with a gasket seat. It is used in a variety of powersport applications, especially import motorcycles. E3.38 is often in used in Honda, Suzuki, Yamaha, and other high RPM engines.

Replaces:
CHAMPION: G57C, G59C
NGK: CR7E, CR8E, CR9E
For reference the factory plug is NGK CR9EH-9

Notice on the NGK replacements the CR# -- it is a single replacement for 3 different hotness plugs. How do I know so much about NGK plugs? I called tech support.
https://www.ctx1300forum.com/forum/...on/31330-spark-plug-upgrade-2.html#post370695


but I also called E3 to ask them why they only sold a single plug for a wide heat range and to verify the correct part number of E3.38 .
https://e3sparkplugs.com/contact/

Basically through broken English I was able to get:

"Yes E3.38 is the correct part to use for this application."

and

"Because in these power sport applications heat range is not as critical so a plug can be designed to run in a wider range. The plug will still deliver all the power, fuel economy and emission needs."

The technical person did say they do sell plugs with very narrow heat ranges in very high performance applications. Simply put the CTX1300 shouldn't care / won't notice. I say tell that to @silverwing

(or maybe that person got a set of defective plugs?)
 

·
Registered
Joined
·
272 Posts
I recently replaced my OEM original factory plugs with E3.38 plugs based somewhat off the information contain in this thread.

Mileage at the time of change was 19,885. I had not noticed any degraded performance, nor was any degradation of the plugs noticeable.

My lifetime MPG is 45. This time of the year, summertime, average mpg with a single rider fueling Top Tier brands by Philips 66, Conoco, or Shell is 48-49 mpg - sometimes 50-51.

Running 4 full tanks of fuel, my observations are faster starts, smoother engine with snappier responses at the throttle, and my riding style and location(s) remain roughly the same.

The negative observation is that my average mpg has seemingly reduced to 45-47mpg.
 
  • Like
Reactions: Illinois

·
Premium Member
Joined
·
1,072 Posts
Thanks for the reminder about these. I'll try them too. Have 44,000 miles now. Time for a little change.


What gap do you set?
 
1 - 20 of 24 Posts
Top