Having one of them was like having a fat eager girlfriend,great fun, me and my mates regularly attempted 3's up down the back of the school fields and when it got too hot and seized up we had to p**** on her to keep it cool.....
I honestly don't have a lot of experience with trials bikes and was hoping that someone would respond to your listing - but I have 35 years of experience with chainsaws and motocross bikes and I really don't think the carbon deposit looks unusual and is pretty typical - I suspect the droplets are just coolant leaked out when the head was taken off. I really don't see that you need to keep taking your head off to decarbon the piston and cylinder head......you are going to wear yourself out taking the engine apart to keep the carbon off as it happens quickly in a two cycle engine. There should not be an interference between the piston and head with the small amount of carbon build up on the piston.
Are you using a good full synthetic oil mixed at the recommended ratio? I don't know about your Beta - my Sherco is mixed at 80:1. Find someone that is familiar with your bike and see if your bike knocks louder than theirs......maybe it is time for you to get a piston or rings if the knocking is caused by excessive clearance between the piston and cylinder.
Took the head off a Rotax engine which had been run 32:1 for decades, virtually no carbon build up !
Tl125 12-tooth Front Sprocket ?
in Honda
Posted
My Tl125 came with a 52t rear sprocket, cant remember what was on the front. Seemed ok at the time.