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ugxvibe

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  1. So we purchased a 2000 Honda Foreman 400 from a guy over a year ago for farm work. It was running well for awhile and then started billowing blue smoke about a year later (oil burning) when ever it was running, even under acceleration. So I decided to take off the cylinder and sent it to a machine shop. I am an auto mechanic by trade so was pretty easy.. Anyways, They are telling me the bore measures 91.5mm. This was sold to us as a 400. The fenders say Foreman 400. What could have been done to this? From what I have read a 400 has an 86mm bore, 450 90mm and 500 92mm. Is this correct? And how is this cylinder measuring 91.5mm? They want to bore it to the next size which would be 92mm (91.96 piston). Could a 400 be bored that much? Or was this actually a Foreman 450 engine? I am so confused right now. Maybe an aftermarket jug or engine swap? I have no idea how to tell. This is my first ATV. I never had any idling/performance issues so I assume it's jetted correctly for the 91.5mm bore? How do I check the jet size and what is recommended? Also, they are telling me the valve seals I ordered for the Foreman 400 are too small for my valves? Are the valve seals for all 3 engine sizes different sizes as well? Sorry for this long rant but I thought I had it all figured out until they told me the bore size. Any help would be appreciated. Thanks!
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