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717 rotax died

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cncsignman

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Well took the 96 speedster out today and one motor quit and will not start. It's like it's locked up. Thought I could have sucked up a stick and impeller was hung up but it was clear. Guy I bought it from said that it had a piston slap. I fear the worse. Any suggestions??
 
That sucks. Next step is to pull the pump. See if it will spin by hand . If its still locked up, rebuild it or replace with another.
 
If so, you know you have a piston or ring issue in most cases. But in any case, then need pulled so you can turn it over by hand once you pull the pump.
 
Pull plugs first and see if you can turn by hand. If you can, could be one or another kind of lock, such as oil seepage.
 
Coastiejoe said:
If so, you know you have a piston or ring issue in most cases. But in any case, then need pulled so you can turn it over by hand once you pull the pump.
Click to expand...

Pulled the plugs and they looked fine. Tried to turn by hand and starter with no luck. What now?
 
hotrodssnova said:
Post up a picture of the plugs.
Click to expand...

14.jpg
 
They look decent to me. Maybe a little rich on the right. Pull the pump and see if the engine will turn. Either way, the pump will need pulled. If the pump is frozen up, you can fix.
 
Yeah, those plugs aren't real bad. If anything the oil mix might be a little lean, but it doesn't look like hydrolock or anything like that.
 
GREAT NEWS!!! pulled the pump and engine started right up!!! Impeller won't budge by hand. Gonna look further at the pump. Any place I should start??
 
Sure is. You fill the bearing chamber with the correct amount of oil, then pump up the chamber with air to a certain psi. It should hold for a few minutes.
As the pump spins, it will heat up. That will pressurize the bearing chamber. That's the reason behind that test.
 
hotrodssnova said:
Sure is. You fill the bearing chamber with the correct amount of oil, then pump up the chamber with air to a certain psi. It should hold for a few minutes.
As the pump spins, it will heat up. That will pressurize the bearing chamber. That's the reason behind that test.
Click to expand...

Good to know. Will rebuild both pumps and install new wear rings while they are out. Debating on changing out the drive seals during this down time since I have all the parts.
 
I just replaced one of my pumps. Went the easy route, ordered one from SBT. $393, but a lot easier than pressing bearings and the seal. Plus, it comes w/ a new wear ring and is plastic (which weighs less).
 
Last edited by a moderator:
Anyone know of a good price on a rebuild kit? Should I replace the shaft too or just new bearings? Not sure what to get.
 
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