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How's your fuel pressure when the carbs seem to go south? How about
EGT's? I have those gauges exactly for this kind of issue.<br><br>
Cheers, Tony<br><br>
At 04:13 PM 8/24/2015, J.C. Hassall wrote:<br>
<blockquote type=3Dcite class=3Dcite cite=3D"">Many thanks to all who
responded.=C2 I should have mentioned that the engine runs like gang
busters then spits at apparently random times (irrespective of
throttle).=C2 I did receive some great ideas, tnx.=C2 The points
are new (replaced the XR3000 as a test), all grounds are common at the
starter and the valves are all set to spec. TDC is bang on and cam timed
properly (I was really AR about that!).<br><br>
I'm going to pull the header and install 2 O2 sensor bungs.=C2
Installing the AFR sensor in the collector was a mistake (I assumed both
carbs would be the same, but now I need to determine if one of 'em is a
problem).=C2 Then I'll start implementing the suggestions.<br><br>
Tnx again to everyone who responded.=C2 I will post the results when
it's running as intended.<br><br>
jim<br><br>
On Sun, Aug 23, 2015 at 8:14 PM, J.C. Hassall
<<a href=3D"mailto:jhassall@gmail.com";>jhassall@gmail.com</a>>
wrote:<br>
<dl>
<dd>My TR4 spits thru the 40DCOEs at idle and speed.=C2 Timing is set
to 32 degrees at 3K RPM, so idle is about 12 degrees.=C2 I thought
that spitting thru the carbs meant too much advance, but I believe timing
is ok.<br><br>
<dd>The AFR (sensor is in the 4-1 collector - bad idea) at idle jumps
between 13.8 and 15.3 (seems like an enormous swing!).=C2 Spitting
doesn't seem to coincide with any specific AFR.=C2 The carbs have
been synched, etc. =C2 34 chokes, 50F9 idle jets, mains are 120 with 200
air correctors.=C2 The mains seem awfully small.=C2 Even so, the
AFR at speed is 12.8-13.5.=C2 Plugs are NGK BP6HS, which are sooty;
the ground lug burns clean about half way.<br><br>
<dd>What am I doing wrong???=C2 I'm at the end of my wit (you're
right Craig, it's a very short walk)<br><br>
<dd>tnx<br><br>
<dd>jim<br><br>
<dd>63 TR4 in autox prep, 99.5% finished, 90% to go<br><br>
</dl><br>
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