firedoctor
New member
"I have a Yamaha 90hp 1986 tha
"I have a Yamaha 90hp 1986 that has the drive shaft siezed to the power head. I realy mean she's stuck. All 11 bolts have been removed and the rear does seperate a little but the crank is well and truly stuck. I have with only just not broken anything, used a engin lift on the fly wheel and bolted the engin to the ground, blasted a CO2 fire extinguisher in the existing 12mm gap to try and cool the drive shaft just under the power head and tapped the drive shaft, still no go. The advise from the local yamaha guy is to cut a hole in the lower unit and cut the shaft with a Sabre saw and then have the shaft re-joined. Where would the best place be to cut the shaft if this is a feasable solution. The rest of the engine is all sweet. Half way down the leg looks posible by the flat area befor the leading edge, is there any exaust channels I need to look out for. I had the enging at the Yamaha workshop but due to time it would cost a fortune in labour. Help someone.. Thanks"
"I have a Yamaha 90hp 1986 that has the drive shaft siezed to the power head. I realy mean she's stuck. All 11 bolts have been removed and the rear does seperate a little but the crank is well and truly stuck. I have with only just not broken anything, used a engin lift on the fly wheel and bolted the engin to the ground, blasted a CO2 fire extinguisher in the existing 12mm gap to try and cool the drive shaft just under the power head and tapped the drive shaft, still no go. The advise from the local yamaha guy is to cut a hole in the lower unit and cut the shaft with a Sabre saw and then have the shaft re-joined. Where would the best place be to cut the shaft if this is a feasable solution. The rest of the engine is all sweet. Half way down the leg looks posible by the flat area befor the leading edge, is there any exaust channels I need to look out for. I had the enging at the Yamaha workshop but due to time it would cost a fortune in labour. Help someone.. Thanks"