Vintage Dirt Bike Q & A

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PostPosted: Sat Mar 10, 2018 1:36 pm 
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Joined: Mon Jan 29, 2018 10:50 am
Posts: 15
am in the middle of replacing all the OEM "cheesehead" screws with allen-head socket screws on my project bike and found an error i made last fall when replacing the points. easy to do i guess 'cause there's little room in there, and the points wire is really short. access is much nicer when the bike is on my bench, and i can actually see what i'm doing.

when reinstalling the stator just now i noticed the points wire insulation was slightly scuffed, and quickly found it had rubbed on the flywheel cam last fall when i ran the ol' girl for a few minutes. i had neglected to carefully place the points wire in the little slot, under the points plate. the wire(s) need to be in the slot to secure them away from the spinning flywheel cam. no harm done, and i taped the area w/scotch 33 just for good measure. the increased diameter holds it in the slot a little better too.

at some point i would have lost spark or had erratic running, and then had a problem finding the cause.
something to watch for. here's a pic showing the points wires and slot i'm taking about.
Attachment:
points.wire.resized.jpg
points.wire.resized.jpg [ 263.05 KiB | Viewed 808 times ]

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76 r75/6 -- mine since 1980
76 mr250 -- a project, coming along nicely!


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PostPosted: Sun Mar 11, 2018 7:24 am 
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Joined: Sun Nov 30, 2008 12:10 pm
Posts: 1010
Location: Connecticut, USA
Looking at that Honda 2t points ignition brought back some (bad) old memories. :) I fought mine for nearly a year before upgrading it; by far the single best thing I did on the bike.

If you end up riding the bike a lot, I'd seriously consider researching a '76 CR250M CDI ignition retrofit (I'm almost positive the stator will drop right in, don't know about the rotor), or a PVL ignition system. The CR125M ignition transformed my MR from a hard-starting, unreliable pig to an easy-start, quick-revving screamer with huge low end.

Electronic advance control is SO much better than points!

Ray

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'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric


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PostPosted: Sun Mar 11, 2018 3:04 pm 
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Joined: Mon Jan 29, 2018 10:50 am
Posts: 15
no argument there, got a dyna III on my airhead and love it. fires immediately, always been a strong runner. 12v with dual coils helps i guess. the only time i've been stranded was on an old dt250 w/points. PO solder job on the points wire looked fine during the winter refresh, so i left it. whoops!

that was long push, from the backside of birdseye mtn in castleton, vt to old rt 4.

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76 r75/6 -- mine since 1980
76 mr250 -- a project, coming along nicely!


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