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Author Topic: pilot jet  (Read 5321 times)

Offline raptorkev

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pilot jet
« on: July 31, 2011, 02:34:53 PM »
hi all what size is the pilot jet in the mk1 amal 30mm
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Offline Rex

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Re: pilot jet
« Reply #1 on: July 31, 2011, 05:31:59 PM »
They used to be 25s, but now they're an unremoveable bush inside the carb, and apparently the size doesn't matter... ;)
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Offline rogerwilko

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Re: pilot jet
« Reply #2 on: July 31, 2011, 08:56:59 PM »
I will not respond to that....wait a minute.. i just did!!
« Last Edit: July 31, 2011, 08:58:42 PM by rogerwilko »
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Offline chaterlea25

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Re: pilot jet
« Reply #3 on: August 01, 2011, 05:23:04 PM »
Hi,
The answer is, "Too Small"
its about 0.015 in. dia
And yes it does matter >:(

HTH
John
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Offline davidg

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Re: pilot jet
« Reply #4 on: August 02, 2011, 01:48:17 AM »
its .014" and you can clean it carfully with a number 78 drill through the air adjuster screw hole.
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Offline phil_h

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Re: pilot jet
« Reply #5 on: August 10, 2011, 10:05:03 PM »
I recommend you drill out the bush and fit a 30 pilot.
With modern 10% ethanol fuel you need another 5% by volume compared to old fuel so all old jetting tables are now wrong.
And what's the biggest prob with amals ... they run weak pilot circuits very quickly because of wear in the crap alloy !
I know the calcs are marginal, but I'd rather have a slightly rich pilot to aid starting and idling myself !
I'm converting all my fleet to run richer pilot circuits.
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Offline toz

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Re: pilot jet
« Reply #6 on: August 11, 2011, 10:55:16 AM »
Gave mine a bit of a poke out last week, the improvement in the smoothness of the running and tickover has been amazing. Engine runs a lot cooler too it seems,It may have been slightly blocked and running too lean.
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