12mont

Hi, I swapped out the crank seal and it rectified my problem of transmission oil leaking into engine compartment.

Thanks, got it done today. Just kept disassembling till I got to the seal! Lol. Will see on tomorrow's ride if it fixed my issue.

Has anyone changed a crank seal on a 4rt? Does the side case housing the clutch have to be taken off? Step by step instructions would be greatly appreciated?

Thanks for all the excellent information. Sportsawyer's explanation sounds very plausible. Is it hard to change the crank seal? Looks like it may be able to be reached by just taking the clutch basket out? The bike doesn't have many hours, so you wouldn't think it would be a crank seal. I'll change it out and see:)

Thanks for the differential diagnosis. I pressure checked both compartments and they stayed pressurized, but maybe oil can seep through where air can't? I will recheck the seals you suggested. It's a 2012 so no warranty.

Thanks for the input. I've done that twice already and each time there is approximately a 100ml more in engine oil and 100ml less in tranny.

Hi, I'd greatly appreciate some help with this issue. If I fill the engine oil to the first line on the dipstick and have about 3 rides totalling about 12 hours, the engine gains about 100ml of oil and the transmission side is down 100ml. I pressure tested the engine and transmission side with about 3 pounds of pressure and no leakage detected. Once transmission is down 100 ml it is very difficult to shift and find neutral. Recently changed clutch frictions. Running Belray 85 in transmission. Thanks