Gary,
Since you have a Colortune does the miss at idle should up as a blip
in the flame? I finally fixed a miss at idle (which showed up as a
yellow flame instead of a blue on the Colortune) by regulating the
fuel pressure. Fuel pressure should be at 1-2 psi any more than that
seems to overwhelm the fuel needle valves for a moment and gives a
mini "flooding" to the mixture. Hook up a tee connector in the fuel
line somewhere between the fuel pump and the carbs and use a vacuum
gage to check the fuel pressure. Excess fuel could cause the bucking/
missing at cruising speed also. Oh and I think the timing should be
around 12 BTDC not ATDC at least that's what mine is set at.
Bud Rolofson
71TR6 CC57365 (Good 6)
66TR4A CTC57806 (The Wreck-Almost parts)
66TR4A CTC57529 (The Project)
71F-250 Camper Special (Triumph Support Vehicle)
Z-50A Hardly Davidson 1977 Honda Mini-Trail Bike (Triumph Pit Bike)
levilevi@comcast.net
On Aug 4, 2009, at 11:35 AM, Gary Nafziger wrote:
> I think there was a thread not too long ago concerning a miss at
> idle which I
> didn't read to carefuly so sorry.
>
> but.............tr-6, S2 cam, new
> overhaul. I've set fuel mixture with colortune and think i have it
> right.
> adjusted timing from 8-14 ATDC, fiddled with idle setting and just
> cannot get
> a miss at idle to go away. taking off from stop comes with
> stuttering and
> cruising in 2nd and 3rd (basically at idle) comes with slight
> bucking/missing.
>
> However at higher revs and pulling its very very strong
> without miss and feels great. Any help or suggestions thanks in
> advance.
> gary n.
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