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  1. #1
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    Default Another Amal Jetting question

    Hey guys, Ive got a 67 Daytona T100R which is a complete rebuild. I picked up an old 928 Amal from a swap meet but it seems to be in ok shape for now. The engine is bored .060 over. with a single 928 Amal Carb with a #3 slide. I've got 2 different main jets laying around, a 200 and a 250. Will either of these work? My guess would be somewhere in between but I honestly dont have a clue where to start.

    Does anyone have any ideas?? Thanks in advance

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    Stock is 220 for single carb 500's iirc. I have the workshop manual, can confirm it tonight.

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    Good guess btw! 👍😀

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    Quote Originally Posted by datadavid View Post
    Stock is 220 for single carb 500's iirc. I have the workshop manual, can confirm it tonight.
    From what I can tell from the parts handbook - The single carb T100C had a 190 main and a 3.5 slide. The dual carb T100R had a 200 main and a 3.5 slide. It also looks like the Dual carbs were larger than the single (although I'm not sure how they convert to the newer concentric Amals).

    I guess I'm looking for a sufficient replacement for the Larger Dual carbs to a Single Carb and bored cylinders.

    Does anyone know of a chart that could get me in the ballpark? I'll do some more searching on the world wide web

    thanks

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    Checked my workshop manual, twin concentrics have 180 mains, so an overbored 500 with single concentric would be a 200/220 main jet. 3 1/2 throttle slide is stock.
    Close enough for clean running i would think.

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    Just an FYI in case anyone else is looking for this answer someday

    after a lot of combinations, this is what seems to be working the best.

    170 Main Jet
    3.5 Slide
    clip in the top slot on needle
    air/fuel screw adjusted way out.

    Seems ok so far (50 or so miles).

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