sputtering issue fixed...it was the timing

[nevets]

I while back I made a post about how my BN6 would sputter (miss) when holding a steady speed and occasionally backfire during decel, yet run smoothly when accelerating. Yesterday I checked the timing using a timing light (purchased from Moss) that has an advance dial. Turns out the timing was advanced 34 degrees! So with the aid of my timing light, I adjusted the timing to 12 degrees advance (my BN6 has a BJ8 head & cam). Problem solved, now she runs great! I was all set to mess with the carbs, glad I started with the easy fix first.

 

[Randy Forbes]

THE FIRST STEP TO TUNING THE CARBS is to verify valve clearance, contact breaker gap AND ignition timing.

NO EXCEPTIONS, unless you just like doing the work for nothing...

 

[nevets]

Thanks for the advice Randy. I actually replaced the points,cond. dist cap, spark plug leads prior to checking timing. Haven't checked the valve clearance yet though. My goal was to troubleshoot/fix a specific problem, which I believe I did. Carbs/mixture seems ok.

 

[Randy Forbes]

It's a known fact: most carburettor tuning problems are electrical... :wink:

 

[John Turney]

"Carburettor", a French verb meaning leave well enough alone.

(Remembered from an old article somewhere in my memory.)