August 19, 2019 at 9:55 am #181578
I’ve been searching forums all morning for advise on replacement plugs for a 4404 Zephyr. I would like to replace them with a shorter plug to allow more clearance between the cover and the plug . However I am seeing allot of different answers to which plug to use. I would like to stay with the screw on terminals [like NGK plugs have] so which plugs do I want? thanks for all the help so far.
US Member - 1 Year
Topics: 155August 19, 2019 at 7:40 pm #181600
I have used the CHAMPION J17LM in a Ranger, Scout, Cub
and this summer in a Martin 75 after one plug shorted out
through the boot to the tank. They seem to be the heat range
for the oil and mix I use in these motors.August 19, 2019 at 8:39 pm #181601
So far my research has turned up that the recommended replacement was champion j-10 , the replacement for that plug is champion j6c. the j6c is a longer overall length .[about 2 inch] I am looking for a shorter overall length plug [like the one in a small chainsaw or weed-wacker] Something like a champion cj6y . I have seen references on the forum about using “shorty” plugs for the Zephyr because of the cover on the motor being so close to the plug terminal ends . I am unsure of the length of the J17LM plug but I think it is also one of the longer types. Thanks for the reply. Hopefully someone out here has the secret decoder ring , and can decipher if there is a short plug that will work in this . If not I will have to stay with the longer style.August 19, 2019 at 9:02 pm #181608
OK after some more digging in the forum I think I found a answer . One of the members suggested NGK plugs BM6A or BM7A replacements to correct this very problem . Thanks for the help.
US Member - 2 Years
Topics: 29August 20, 2019 at 9:06 am #181614
You said you like the screw on tops so I’m guessing you use a connector that fits under it. If so, Brillman has the thumbscrew type tops in metric for new plugs. They are a bit shorter than the long stock screw on piece. That might be just enough to help.
Topics: 31August 20, 2019 at 8:30 pm #181668
The original J10 commercial J was changed (renamed) J6-J around 1946. These became J6-C when they went to a solid copper center electrode. The short plugs are the same number with a preceding C, ie. CJ6-C. From the 1949 Champion catalog – Note the C7 is a hotter plug than the 7 – later books are fuzzy on this distinction. Factory recommendations are not etched in stone. running conditions vary. check the look of the insulator. Adjust to the heat range that matches your running condition.
Garry in Michigan
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