Advice on Amal settings for ‘74 850 please

Bonzo · Jul 22, 2022

johnm said:
- ultrasonic cleaning of carbs and blowing out of all passages
- correcting fuel level on one carb
- and very importantly polishing the rough edges of the stamped out tags on the premier carb floats. These tags can catch on the fuel needle and either flood or starve the carb. This problem has been reported by Norman White and independently identified by an engineer friend of mine.

Ooh interesting! (sorry to derail the thread for a second)

I have a new pair of Amal Premiers sitting in a box until fitment time comes. If I hadn't read this, I would've just bolted them on assuming they were ready to go.

Are you recommending taking a needle file (or similar) to this area..?

Advice on Amal settings for ‘74 850 please

johnm · Jul 22, 2022

Bonzo said:
Ooh interesting! (sorry to derail the thread for a second)

I have a new pair of Amal Premiers sitting in a box until fitment time comes. If I hadn't read this, I would've just bolted them on assuming they were ready to go.

Are you recommending taking a needle file (or similar) to this area..?

Yes that's the issue. There are a few threads around about that. I'll see if I can find them.

One seemed to suggest Amal had identified the issue and corrected it but I'm not certain if that's correct.

The other thing is to check all the passages are clean of swarf and use a 19 pilot jet. The one that screws in from the side. Three rings.

Fast Eddie · Jul 22, 2022

Bonzo said:
Ooh interesting! (sorry to derail the thread for a second)

I have a new pair of Amal Premiers sitting in a box until fitment time comes. If I hadn't read this, I would've just bolted them on assuming they were ready to go.

Are you recommending taking a needle file (or similar) to this area..?

That’s the area yes, burrs around where it was stamped are the potential issue.

Bonzo · Jul 22, 2022

Mine are the new alu bodies, so may have had that addressed by Amal, but I'll check that out, thanks for the heads up.

Fast Eddie · Jul 22, 2022

Bonzo said:
Mine are the new alu bodies, so may have had that addressed by Amal, but I'll check that out, thanks for the heads up.

Please let us know what you find…

Bonzo · Jul 22, 2022

Fast Eddie said:
Please let us know what you find…

Will do.

Bonzo · Jul 24, 2022

Fast Eddie said:
Please let us know what you find…

All great

No rough edges on the tags, no swarf hiding behind the removable jet or adjustment screws.

Fast Eddie · Jul 24, 2022

Bonzo said:
All great

No rough edges on the tags, no swarf hiding behind the removable jet or adjustment screws.

Your bikes gonna run like a dream me thinks !

baz · Jul 24, 2022

Bonzo said:
All great

No rough edges on the tags, no swarf hiding behind the removable jet or adjustment screws.

Have you had the slides out?
If not check they are not sharp on the bottom edges

Bonzo · Jul 24, 2022

Will do baz, cheers

daveforty · Jul 24, 2022

I bought a pair of those last year, a good investment. But I did find the fuel level in the left was different to that in the right, so a bit of float tang bending was required. Very small adjustments make quite large differences to the fuel level in the float bowl. I bought the float bowl adaptor and clear tube kit from AN, made the job easy.

Advice on Amal settings for ‘74 850 please

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