model B43M

505 Views 3 Replies 3 Participants Last post by ras101, 3 mo ago

attaboycase

Discussion Starter · 3 mo ago

working on a model B43M onan engine. it is the 3-1/4 inch bore. the casting no. on the pistons are onan no. 112-0164. i need rings for it but am having trouble locating a set? the old top and second rings measure .090. can anyone tell me what is the correct ring set to get for this engine? thanks, also in the engine the two rods were different one bieng bieffier than the other. both same casting no. 170-3439? the reason for the tear down was low compression at just over 50#

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mryeti117

· #2 · 3 mo ago

attaboycase said:
working on a model B43M onan engine. it is the 3-1/4 inch bore. the casting no. on the pistons are onan no. 112-0164. i need rings for it but am having trouble locating a set? the old top and second rings measure .090. can anyone tell me what is the correct ring set to get for this engine? thanks, also in the engine the two rods were different one bieng bieffier than the other. both same casting no. 170-3439? the reason for the tear down was low compression at just over 50#

I would message Boomer he is the Onan expert here good luck