BONNIE BITS
Oil Filler Plugs:
LC Fabrications vs Joker Machine vs Triumph

I received a couple different oil filler plugs (or caps, if you’d like), so I thought I’d compare them.

The stock Triumph oil filler plug:

Stock Triumph oil filler plug  for the Bonneville T100. Bonnie Café.
Stock Triumph oil filler plug for the Bonneville T100. Bonnie Café.

The first contender, the LC Fabrications oil cap:

LC Fabrications oil cap for the Triumph Bonneville T100 motorcycle. Bonnie Café.
LC Fabrications oil cap for the Triumph Bonneville T100 motorcycle. Bonnie Café.
LC Fabrications oil cap for the Triumph Bonneville T100 motorcycle. Bonnie Café.
LC Fabrications oil cap for the Triumph Bonneville T100 motorcycle. Bonnie Café.

And the second, the Joker Machine oil filler plug:

Joker Machine oil filler plug for the Triumph Bonneville T100 motorcycle. Bonnie Café.
Joker Machine oil filler plug for the Triumph Bonneville T100 motorcycle. Bonnie Café.
Joker Machine oil filler plug for the Triumph Bonneville T100 motorcycle. Bonnie Café.
Joker Machine oil filler plug for the Triumph Bonneville T100 motorcycle. Bonnie Café.

Both are aluminum, very well machined and come with O-ring. Let’s compare both in place against the stock oil cap:

Stock Triumph oil filler plug for the Bonneville T100. Bonnie Café.
Stock Triumph oil filler plug for the Bonneville T100. Bonnie Café.
LC Fabrications oil cap for the Triumph Bonneville T100 motorcycle. Bonnie Café.
LC Fabrications oil cap for the Triumph Bonneville T100 motorcycle. Bonnie Café.
Joker Machine oil filler plug for the Triumph Bonneville T100 motorcycle. Bonnie Café.
Joker Machine oil filler plug for the Triumph Bonneville T100 motorcycle. Bonnie Café.

Both the LC Farbrications and Joker Machine are big improvements over the stock Triumph cap, aesthetically and functionally. Removing them, the stock cap requires a quarter, the LC Fab a 19mm wrench, and the Joker Machine a hand. For me, this is a big plus for the Joker Machine plug. Aesthetically, the LC Fab is cool with the finned design but overall, I prefer the Joker Machine with its holes and lower profile. Holes vs fins, it’s all subjective.

I’m sticking with the Joker Machine. I’ll be changing the oil every 3000 miles, so being able to remove it by hand will make the process a little bit easier.

Tools Required:
Large diameter coin
19mm wrench or crescent
Hand

Company URL:
LC Fabrications

Joker Machine

Price:
$40 – LC Fabrications Modern Triumph Oil Cap Black
$40 – Joker Machine Triumph Oil Filler Plug Clear

Update, 2015.05.03: In the comments, Joey commented on the Joker Machine plug not being a perfect fit. I went back and took a closer look and sure enough, he’s spot on. You can see in the following photo that the diameter is 1-2mm too small.

Joker Machine oil filler plug on the Triumph Bonneville T100 motorcycle. Not a perfect fit. Bonnie Café.
Joker Machine oil filler plug on the Triumph Bonneville T100 motorcycle. Not a perfect fit. Bonnie Café.

8 Comments

  1. The joker didn’t work for me. First the diameter is too small exposing; doesn’t fully cover the mounting area. (Easier to see this with a black one.) second the supplied o ring broke during the first ride. So i went back to thE oem one.

      1. On my 2015 mag wheel. You can kind of see what I’m talking about in your picture of the silver joker installed. With a black joker you can really see how its just a little too small. If the o ring didn’t break on the first ride, i might still have used it. The o ring was actually a little too big to fit in the grove of the cap.

  2. While I liked the LC Plug (BTW, us old-school Triumph guys use a proper tool (other than a quarter) to open those plugs… there’s several on Meriden and earlier Trumpets.. ;)- I have found that the anodizing was not the longest-lasting- this seems to be a common lament with aftermarket bits coming from the Far East- I’ve a set of levers whose anodizing has faded pretty badly after 5+ years…. To be fair, one can buy several sets for the cost of Pazzos, but still…

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