Points gap?

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Sal
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Points gap?

#1 Post by Sal » Tue Apr 20, 2021 5:12 pm

Hello folks,

Can some of you fine people confirm the points gap for my Triumph (mk2 2.5 PI on carbs)

I’m sure the distributor is a 25D!?

Thanks a million

Sal

Charles H
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Re: Points gap?

#2 Post by Charles H » Wed Apr 21, 2021 8:06 am

0.015 in (0.4 mm).
Charles Harrison
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Sal
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Re: Points gap?

#3 Post by Sal » Wed Apr 21, 2021 5:23 pm

Lovely thanks Charles

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Re: Points gap?

#4 Post by Sal » Wed Apr 21, 2021 7:13 pm

I’ve had a blank Charles, do you set the points on the flat or the point of the cam?

johnnydog
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Re: Points gap?

#5 Post by johnnydog » Wed Apr 21, 2021 8:09 pm

The point of the cam opens the points against the 'heel', so they need to be set whilst open against the cam.
I presume you know how to set points, but.....just in case.......when fitted (don't forget the double insulation washer), just nip the securing screw sufficiently so that it holds the points open, but slack enough to use the cut out in the points base to adjust them by twisting a flat bladed screwdriver to increase or reduce the gap with the feeler gauge in position. Once the gap is correct, tighten the securing screw, rechecking the gap is a sliding fit (without the feeler gauge actually opening the gap when inserted).
If checking previously used points, be mindful there may be a 'pip' on one side of the contact surface (which is normal) but this will give an inaccurate gap, so it needs filing off, or a new set of points fitting. Some makes of new points have a coating on the contact surface to reduce any corrosion (Lucas in the blister pack were known for this), which needs removing (otherwise you may question yourself as to why you have no spark!). I find the best way is to slide a very small piece of fine wet / dry emery through the contacts whilst under slight tension for a couple of passes which does the trick.
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Sal
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Re: Points gap?

#6 Post by Sal » Mon Apr 26, 2021 9:11 pm

Thanks Johnnydog, great knowledge as ever

Rod 2500S
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Re: Points gap?

#7 Post by Rod 2500S » Sun May 16, 2021 4:18 am

gday sal, according to my manual its either a 25D6 or 45D6
Might pay to check the wear on the dissy shaft bearings, excessive wear causes the points gap to vary resulting in uneven spark and variations in the timing. Also check the mechanical advance gubbins under the points plate.
If it's worn I'd change it for an electronic version, check previous posts on this topic for the pros and cons.
I have an electronic ignition module (built from a kit - Jaycar KC 5513 available in OZ check the internet) which uses a preprogrammed chip to compensate for points and distributor wear. It has the advantage that if the module fails it is very easy to reinstate the points to get you home. I don't think an electronic dissy will do this if it fails i think your stuck.
HTH
Rod

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