Agreeing with Mark,  O2 sensor.   Had similar issue with my
91 and a replacement O2 sensor fixed it.

Steven
91 Westy

On Fri, Feb 27, 2015 at 3:05 PM, mark drillock <mdrillock@cox.net> wrote:

> This sounds like it could be related to the oxygen sensor circuit. When
> the engine is cold the ECU ignores the O2 sensor. Once the engine warms
>
>
> Mark
>
>>
>>>