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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-10-2012, 04:19 PM   #1 (permalink)
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How to Determine Pilot Jet Size?

I dropped out the pilot jets today just to look at their size, thinking that since the PO had changed the MJ's to 128's he might also have increased the pilots at some time.
They came out easily and look clean, but I can't find anywhere, even under a glass, where they're size stamped.
I must be the first to run into this, because there wasn't any previous posts on this question.
Maybe there's a difference in 'size' that I should be looking for?

Thanks
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Old 11-10-2012, 05:13 PM   #2 (permalink)
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Check the side of the jet closely, not the top. I have seen some that are very faint when stamped on the side.....
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Old 11-10-2012, 06:31 PM   #3 (permalink)
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Quote:
Originally Posted by gbc View Post
Check the side of the jet closely, not the top. I have seen some that are very faint when stamped on the side.....
That's where I'd expect to see it, but the spring action likely rubbed it off by now. I'd have liked to know what they are, but it runs/idles well so guess I can forget about it.

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Old 11-10-2012, 06:43 PM   #4 (permalink)
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Spring action? My pilots aren't held in with springs. My air mixture screws are, but not my pilot jets. Are you sure you're looking at the pilot jets?

Your pilot jet should look like this:

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Last edited by bluesforchallah; 11-10-2012 at 06:48 PM.
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Old 11-10-2012, 07:56 PM   #5 (permalink)
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Wow.........Was I screwed up.....I think I even knew that but wasn't thinking when the screwdriver suddenly appeared in my hand.

Sunday suddenly seems like a good day to check my pilot jets.

Thanks much Chris -
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