Try enrichening the carbs a smidgen.
bs
PhilRitten@aol.com wrote:
> All,
>
> I am still getting a "puffing" noise from my BN4/6 after I have driven it a
> little. After warming it up, I take it up on the freeway a mile or two, turn
> around and bring it home. After that, every fourth or fifth sound out of the
> tail pipe is a "puffing" sound. Interestingly, the idle is still smooth (no
> obvious missing). The only way you can tell there is a problem is listening
>to
> the tail pipe. BTW - when idling and warming up in the garage there is a
> steady staccato sound from the tail pipe.
>
> I'm rather puzzled. I replaced the plugs/cap/rotor/wires and set the timing
> around 15 BTDC. I looked under the hood at night (in the dark) to see if
> there was any shorting and didn't see anything. There doesn't seem to be the
>same
> problem with the rotor rubbing on the cap that I had before. By the way, I
> have electronic ignition.
>
> I'm wondering if it could be something like a bad coil or something that
> fails once it has warmed up.
>
> Thank you all,
>
> Phil
>
*******************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
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