Is it really necessary do you think for him to pull the motor out to take the cylinders off to rotate the crank? Seems like a lot of extra work if the crank is ok, engine would need to be aligned if the motors pulled?
Okay thank you I will try that, i do know it’s got 216 hrs on it.
That’s what I had read a few times so I just don’t know what to do, I hate to spend the time and money on the crank and it be okay but also put the time and money into a top end and then it blow up. I like the test popps said, if that test checks out I’ll just do a top end?
What condition is it in? Is it currently running? What was the compression in it? Unlike all the other 2 strokes were 150 is perfect compression I think 130 is near perfect on the 951’s isn’t it?
It’s hard to say, with that many hours it is a bit of a gamble from what I’ve read, if it were any other engine I would definitely be more apt to just do a top end but after reading so many times to do the bottom as well on these it is a gamble. What’s a top end going to cost? Maybe 700.00 with machining, rings, pistons, gaskets, I guess it’s a personal decision depending on what you have in it, what your plans are for the machine in the future. Not really sure how much a rebuilt crank is but probably in the 800.00 range I would think?
With those compression numbers your going to need to figure out what happened to cause that pto cylinder to go to 30 pounds or it will happen again right away with your rebuilt motor, probably be a good idea to pull the motor and do a leak down test to check the outer crank seals for leaks.
I wasn’t sure, I was asking more than anything. Didn’t know if you had to take the jet pump off or not if it would cause to much drag when rotating the crank to tell if the crank was bad or not. Thanks
The inner ones can’t be changed, you would need to get a remanufactured crank if they were bad mind you again they are not as important, a lot of people run t machines with no problems even with the inner ones leaking. The outer ones I’m not sure about, I get mixed up with the snowmobiles and different Seadoo engines, I’m not 100 percent sure if the seals are integrated as one with outer bearing and need to pressed on and off or if the seal is seperate, I think they are seperate from the bearing but think the crankcase needs to be split to change them. You would want to verify with someone else or your shop manual to be sure on that.
Yes, now that I’m thinking about it, I’m pretty sure those outer seals can be changed, at least on the 717 so hopefully the 951 is the same. But again the crankcase would need to be split to do so. With any luck, they are not leaking, perhaps that 30 pounds is due to a broken ring or a leak at the carb base gasket or maybe a carb issue but you would probably want to verify all this.
