Single carb manifold screw fix idea

Fast Eddie · Jul 23, 2025

I saw this on FB and thought it worth sharing for you single carb folks.

A fix to prevent the middle screws coming loose and becoming ingested.

Drill and tap the manifold and use grub screws to tighten onto the Allen head of the centre bolts.

Clever…

Matchless · Jul 23, 2025

Perhaps the person who came up with that idea had never heard of Loctite. Other brands are of course available.

baz · Jul 23, 2025

Best not to use the middle screws in my experience

gpzkat · Jul 23, 2025

Matchless said:
Perhaps the person who came up with that idea had never heard of Loctite. Other brands are of course available.

Red Loctite is not gonna let go. I had never really known of it, or thought about it much, but once I got into my first (and only, so far) Norton bottom end I learned it was the stuff. I did some tests on spare bolts using the bench vise to see what was up with it. Wow. I had to torch it far beyond engine temps to loosen, and still it gave up a good fight. That's what's holding my 2:1 manifold as well as bottom end stuff, and it ain't budging a bit, no way, no how. I appreciate belt and suspenders approaches, but was quite satisfied with a simple $5 'solution' and remain so.

Matchless · Jul 24, 2025

gpzkat said:
Red Loctite is not gonna let go. I had never really known of it, or thought about it much, but once I got into my first (and only, so far) Norton bottom end I learned it was the stuff. I did some tests on spare bolts using the bench vise to see what was up with it. Wow. I had to torch it far beyond engine temps to loosen, and still it gave up a good fight. That's what's holding my 2:1 manifold as well as bottom end stuff, and it ain't budging a bit, no way, no how. I appreciate belt and suspenders approaches, but was quite satisfied with a simple $5 'solution' and remain so.

Around twenty years ago I converted my Tiger 750 to screw in exhaust stubs. To stop them coming loose at some point down the line I contacted Loctites tech dept. They suggested the high strength 272 grade as it would withstand the temperature. Those stubs have never moved. I've just used the same stuff on a T160 head.

Tornado · Sep 6, 2025

Matchless said:
Around twenty years ago I converted my Tiger 750 to screw in exhaust stubs. To stop them coming loose at some point down the line I contacted Loctites tech dept. They suggested the high strength 272 grade as it would withstand the temperature. Those stubs have never moved. I've just used the same stuff on a T160 head.

This is comforting to know as my Commando ex ports are brass alloy sleeved and held in their threads with a locktite product. Something I was concerned about with the very high heat in that area. No problems after many thousands of miles on them.

Single carb manifold screw fix idea

Fast Eddie

Matchless

baz

gpzkat

Matchless

Tornado

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