Hi, again, thanks to all for your input. Most useful. The mower is in fact for an entire allotment, so it's anyone's guess how badly abused it is. Interesting that a 135 might not be up to the job, particularly on long grass. I can believe that. I know when I tried it after after after noticing the ...

Hi guys, thanks so much for your suggestions. A few had occurred to me already, so I can answer a few of the issues raised right away: 1) Long grass seems to be the issue Not sure if it's just something we'll have to live with, but as you say hopefully lighter loading will allow the soot to burn off...

Hi,
yes, I checked the service manual. NGK BPR6ES

Best regards
Jonathan

Hi all, I'm looking after a shared Honda mower with a GCV135 engine, and recently changed the plug for a new one. It ran beautifully, and after sitting at full speed but under no load for ~15 mins the plug was still looking brand new. 1 day later after some of the other users have been mowing long g...