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Hi everyone I have a solo 644 that needs a new piston and cylinder, a mate told me that a solo 651 top end will fit into it no problem is this true can I get a 651 piston and cylinder and rebuild it with that?
The 644 cylinder has 42mm bore, the 651 cylinder has 45mm bore: a 651 piston will not fit in a 644 cylinder. What I said before is the base bolt pattern for either cylinder is the same, NOT that the cylinders are the same.
The 644 and 651 use either a Walbro HDA 103 or HDA 127, similar carburetors.
Good luck find a piston and cylinder. NOS Solo parts in US have dried up.