Our Honda 130 recently gave up too. It started by slightly idling rough, then progressively getting worse.
When it conked we took the cylinder head off to discover that the head was pitted, almost as thoughy one of the rings had deteriorated, in cylinders 3+4 and damaged the pistons and head quite badly. Under closer examination it was found that the head is cracked and the block is cracked top to botton down chamber 3.
Not impressed as you can guess, it has never overheated ar been ran low on oil.
I spoke with the Honda racing team in Southampton who thrash the 130hp and they have never heard of this happening. Is that why the cooling system on the Honda 135 is totally different now?
Not had a great time with the engine from the start since buying it second hand. Firstly it started pumping out white smoke under the hood, the alternator had cooked due to a loose main feed. The the coils, ecu, main relay all blew due to this. Got another month or two out of it before the above happened.
Looking for a replacement, any ideas?