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Oil disappearing

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Headush

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First I'd like to thank the forum for the wealth of knowledge . It has helped rebuild/restore two clapped out 93's .
On to my issue. I have a 587 motor running fine maybe a little lean but have only had it out 2 short times so could be adjustments .
Its running on premix with blockoff plate and the engine crankcase oil lines connected together .
Well oil is being eaten up somewhere. Not to much but enough that i top it off every 30 mins just to be careful.
Have checked mag cover and around pto .no oil leaks that i can see . Also does not leak while sitting only eats while riding .
Does not appear to be fouling plugs. Any ideas? because the other 587 motor does not have this issue.
 
My first guess would have been inner crank seals, but you say it's not fouling plugs or hydro-locking after sitting, so probably not it. Maybe RV shaft seal?
 
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