Motorcycle Repair: deceleration/idle popping in Honda 2001 Vt750 Shadow, vacuum leaks, valve problems

Question
My Shadow pops during deceleration and while idling at intersections.  Any ideas
for a solution to this problem?

Answer
Hi Wayne,

Deaceleration backfiring is caused by the air-fuel mixtures leaning out as engine speeds decrease and the throttle closes.

Other common causes are:

Worn, varnished, or defective air cut-off diaphragms on the carburetors.

Improperly tuned air-fuel mixtures in general (jetting).

Worn or defective carbs.

Carburetor synchronization out of service limits.

Vacuum leaks.

Defective ignition system.

Weak or defective battery or charging system.

Cylinder head/valve problems.


I suspect your carbs need cleaned, tuned, and synchronized.

I return tech information files by email. There was no email address with your question as requested and explained in my instructions.

Respectfully,
Mark Shively