The broken bolt needs to be drilled down the middle till its close to the inner threads then pick out the pieces left and retap it.
The first engine is a right side drive engine the 5 to 1 transmission reverses the engine direction or the engine would turn backwards and the rear wheel.
I would not buy on Amazon, Ebay got a new engine just like that for $119 to my door. The new engines say 49cc, 44mm bore, but the bore is 42.7mm not sure of the stroke. There still better than a 33cc hands down,lol. I got a modded cyld from Boosted306, here on PBP for $60 for that engine it has a Walbro WT-813 16mm pumper carb and Jet Pro exhaust, very fast.
The first engine is a right side drive engine the 5 to 1 transmission reverses the engine direction or the engine would turn backwards and the rear wheel.
I would not buy on Amazon, Ebay got a new engine just like that for $119 to my door. The new engines say 49cc, 44mm bore, but the bore is 42.7mm not sure of the stroke. There still better than a 33cc hands down,lol. I got a modded cyld from Boosted306, here on PBP for $60 for that engine it has a Walbro WT-813 16mm pumper carb and Jet Pro exhaust, very fast.