Guys thanks for the suggestions.
I swapped the muffler with a known good one and it still had the same problem. It runs great until it gets hot then is starts to cough and backfire. It won�t stall but it sounds pretty poor.
AVB you got me thinking about the coil so I swapped one from another Chonda. Again it ran good whilst cold but the difference this time was it kept running nicely. Exactly what you would expect from a well-tuned overhead valve engine � no missed shots. I gave it a good 5 minute or so test.
I am not yet 100% convinced but things are starting to look up with this unit.
At this stage pending no other suggestions I plan on giving the mower a good couple of runs before I pass judgement on the repair.
Any other suggestions or thoughts are welcome.
I have marked this coil in my spares box as being potentially faulty.
BB � It�s definitely a Chonda. Rover make a similar version just with a different cowl. As for the history comments that sure isnt my area of expertise so I�ll leave that for the other guys.
