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<p>Run it in a dark garage (with plenty of ventilation) and look for
spark leakage (dist. cap + wires). <br>
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<div class="moz-cite-prefix">On 8/2/2017 5:50 PM, i erbs wrote:<br>
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<div dir="ltr">did you change the rotor? simple test. I have seen
this happen with a bad rotor or even the carbon piece/and spring
that connects the cap to the rotor.</div>
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<div dir="ltr">Ira Erbs
<div>Portland,OR</div>
<div><span style="font-family:'Times New
Roman',serif"> _______
_______</span><br
style="font-family:'Times New
Roman',serif">
<span style="font-family:'Times New
Roman',serif"> (______ \____1959
BN4____/ _______)</span><br
style="font-family:'Times New
Roman',serif">
<span style="font-family:'Times New
Roman',serif">
(_________________________)</span></div>
<div> BT7 engine and disk
brakes</div>
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<div><span
style="color:rgb(51,51,51);font-family:"Helvetica
Neue",Helvetica,Arial,sans-serif;font-size:14px">A racing car is an
animal with a thousand adjustments.
Mario Andretti</span><br>
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<div>Please excuse random auto corrects
and misspelled words</div>
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<div class="gmail_quote">On Wed, Aug 2, 2017 at 4:35 PM, Larry
Paterson <span dir="ltr"><<a
href="mailto:Larry@patersondesign.ca" target="_blank"
moz-do-not-send="true">Larry@patersondesign.ca</a>></span>
wrote:<br>
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<p class="MsoNormal">Hi folks – here’s one for you to
ponder. For the past many years I’ve raced my 100M
without a problem. Lately however at around 4500 RPM
under load it balks and stutters running quite rough.
I’ve checked timing, changed the condenser several
times checked carbs and all the other usual stuff.
When not under load it revs freely. The motor has a
billet crank, roller rockers, aluminium head, 100S
pistons, lightened flywheel etc and regularly ran up
to 6500 – 7000 RPM with no issues. It also has a
Mallory distributor and is running 24 degrees of
advance. Any advice on where to look next would be
much appreciated.</p>
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<p class="MsoNormal">Thanks</p>
<p class="MsoNormal">Larry Paterson</p>
<p class="MsoNormal">100M, BN7, </p>
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