[TR] missing idle

[Bud Rolofson]

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 at 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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