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Many thanks to all who responded. I should have mentioned that the engine
runs like gang busters then spits at apparently random times (irrespective
of throttle). I did receive some great ideas, tnx. 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!).
I'm going to pull the header and install 2 O2 sensor bungs. 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). Then
I'll start implementing the suggestions.
Tnx again to everyone who responded. I will post the results when it's
running as intended.
jim
On Sun, Aug 23, 2015 at 8:14 PM, J.C. Hassall <jhassall@gmail.com> wrote:
> My TR4 spits thru the 40DCOEs at idle and speed. Timing is set to 32
> degrees at 3K RPM, so idle is about 12 degrees. I thought that spitting
> thru the carbs meant too much advance, but I believe timing is ok.
>
> 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!). Spitting doesn't seem to
> coincide with any specific AFR. The carbs have been synched, etc. 34
> chokes, 50F9 idle jets, mains are 120 with 200 air correctors. The mains
> seem awfully small. Even so, the AFR at speed is 12.8-13.5. Plugs are NGK
> BP6HS, which are sooty; the ground lug burns clean about half way.
>
> What am I doing wrong??? I'm at the end of my wit (you're right Craig,
> it's a very short walk)
>
> tnx
>
> jim
>
> 63 TR4 in autox prep, 99.5% finished, 90% to go
>
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<div dir=3D"ltr">Many thanks to all who responded.=C2=A0 I should have ment=
ioned that the engine runs like gang busters then spits at apparently rando=
m times (irrespective of throttle).=C2=A0 I did receive some great ideas, t=
nx.=C2=A0 The points are new (replaced the XR3000 as a test), all grounds a=
re 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!).<div><br></div><div>I=
'm going to pull the header and install 2 O2 sensor bungs.=C2=A0 Instal=
ling the AFR sensor in the collector was a mistake (I assumed both carbs wo=
uld be the same, but now I need to determine if one of 'em is a problem=
).=C2=A0 Then I'll start implementing the suggestions.</div><div><br></=
div><div>Tnx again to everyone who responded.=C2=A0 I will post the results=
when it's running as intended.</div><div><br></div><div>jim</div></div=
><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, Aug 23, =
2015 at 8:14 PM, J.C. Hassall <span dir=3D"ltr"><<a href=3D"mailto:jhass=
all@gmail.com" target=3D"_blank">jhassall@gmail.com</a>></span> wrote:<b=
r><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">My TR4 spits thru the 40D=
COEs at idle and speed.=C2=A0 Timing is set to 32 degrees at 3K RPM, so idl=
e is about 12 degrees.=C2=A0 I thought that spitting thru the carbs meant t=
oo much advance, but I believe timing is ok.<div><br></div><div>The AFR (se=
nsor is in the 4-1 collector - bad idea) at idle jumps between 13.8 and 15.=
3 (seems like an enormous swing!).=C2=A0 Spitting doesn't seem to coinc=
ide with any specific AFR.=C2=A0 The carbs have been synched, etc. =C2=A034=
chokes, 50F9 idle jets, mains are 120 with 200 air correctors.=C2=A0 The m=
ains seem awfully small.=C2=A0 Even so, the AFR at speed is 12.8-13.5.=C2=
=A0 Plugs are NGK BP6HS, which are sooty; the ground lug burns clean about =
half way.</div><div><br></div><div>What am I doing wrong???=C2=A0 I'm a=
t the end of my wit (you're right Craig, it's a very short walk)</d=
iv><div><br></div><div>tnx</div><div><br></div><div>jim</div><div><br></div=
><div>63 TR4 in autox prep, 99.5% finished, 90% to go</div></div>
</blockquote></div><br></div>
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