500 EFI compression
#1
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Join Date: Dec 2015
Location: L.I. New York
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500 EFI compression
Looking for some opinions please. Found a beautiful boat for sale with a 2001 500efi. 338 hrs, springs done at 300 hrs. Compression done 165 high, one cylinder was 145 and one 135. Is that range to much? Was told there is probably a problem. What should the numbers be? Thanks for any info
#5
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you can put rings and rod bearings and lap the valves in a tired old engine and get good compression readings across the board. there are guys on here who won't buy a boat with the engine in it. unless the engine comes with paperwork and a warranty, you pretty much gotta consider it little better than a rebuildable core. and an engine is easier to fix than a hull or stringers or interior, etc. if the boat is better than the other choices you have in your price range... I am not saying buy it anyway, but you can usually get the price down a bit more too.
#6
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you can put rings and rod bearings and lap the valves in a tired old engine and get good compression readings across the board. there are guys on here who won't buy a boat with the engine in it. unless the engine comes with paperwork and a warranty, you pretty much gotta consider it little better than a rebuildable core. and an engine is easier to fix than a hull or stringers or interior, etc. if the boat is better than the other choices you have in your price range... I am not saying buy it anyway, but you can usually get the price down a bit more too.
#7
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When I was looking to buy I wanted a boat that had motors that where unopened for the reason above. My 500efi's had 345 on them and where never opened and to me that was a good thing. The winter after I got it it went in to get top ends and a good go through that way I knew it was done right by the guy I wanted to do it. Now I don't second gess the work that was done or sead to be done. Just my opinion
#9
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if a cylinder is 10% or more down their is a problem,it is usually caused from poor sealing at valve&seat.this is very common on the hp500 engines.