weird issue with 110cc atv piston size at 47mm instead of 52mm

pcbisnice · 09-15-2024, 12:53 PM

Hi everyone. I have 2 roketa 110cc atvs. both automatics. Both cylinders are stamped 107cc on them. I put a new piston and cylinder into one earlier this year without issues. I am currently trying to do the same with the other but the sizes are off. I bought the exact same kit, 52.4mm. It does not fit. I measured the old piston and it's 47mm across. The 110cc engines should have a 52mm piston, correct? The engine is stamped 107cc... but it's got a piston from something smaller? My research shows the 47mm piston was in the 70cc and some 90cc. How do i have one on a 110cc? It doesn't make any sense at all. The new sleeve won't fit the block, it's too big to slide down in. I have googled a ton, but it seems I am the only one to have this issue. I am hoping I just missed something? Have any of you ever seen a 110cc chinese engine with a 47mm piston? is there anything else i need to check?

09-15-2024, 12:53 PM	#1
pcbisnice Join Date: May 2020 Posts: 20	weird issue with 110cc atv piston size at 47mm instead of 52mm Hi everyone. I have 2 roketa 110cc atvs. both automatics. Both cylinders are stamped 107cc on them. I put a new piston and cylinder into one earlier this year without issues. I am currently trying to do the same with the other but the sizes are off. I bought the exact same kit, 52.4mm. It does not fit. I measured the old piston and it's 47mm across. The 110cc engines should have a 52mm piston, correct? The engine is stamped 107cc... but it's got a piston from something smaller? My research shows the 47mm piston was in the 70cc and some 90cc. How do i have one on a 110cc? It doesn't make any sense at all. The new sleeve won't fit the block, it's too big to slide down in. I have googled a ton, but it seems I am the only one to have this issue. I am hoping I just missed something? Have any of you ever seen a 110cc chinese engine with a 47mm piston? is there anything else i need to check?
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