I have an MTH Premier NYC Mohawk L-3a Item 20-3372-1.
From the beginning, it had weak smoke output at slow speeds (when producing individual chuffs.)
The smoke volume improved at speed when the fan was running constantly.
I took it apart with the hope of fixing it.
I replaced the wick that was slightly burnt.
After reassembly the problem is worse.
There is plenty of smoke in the stack but, at slower speeds, the fan does not produce enough push to clear it from the stack. At higher speeds the fan gets stronger and pushes the smoke out like it should.
After running at higher speeds for a while, the fan fails to push the smoke out of the stack.
I suspect that there is excess friction in the fan that restricts the puffing action and overloads the fan circuit.
Any suggestions on how to fix this would be appreciated.