Engine Issues

[Rotorhead65]

So I pulled my motor out of my 2000 RN to put the Lightweight Couplers on and to send my Flywheel away to be lightened. I never expected to see this. Is this a bad crank seal? If I wouldnt have pulled the cover to get the stator what would have happened???

 

[Sospikey]

In stock form it would 've kept running for quite a while. It would be harder to start and would probably run lean as the seals would get worse. Some goo will always be inside from whatever oil/grease you put on the bendix. What you have is the result of bad seals. Hit jetmaniac up for some replacements!

 

[Rotorhead65]

I was 99% sure it was a crank seal. I really was planning on doing a motor build next winter, because I refoamed and installed foothold this winter. So now that ive opened another can of worms what can I do to the engine? I want to keep it reliable and easy to start and not have to adjust the carbs to much. Send it out to be ported?

 

[haggis]

Mine was similar when i pulled the front cover, mabey not quite as bad but still. On inspection the front crankshaft seal was done so i put it down to that.

It could possibly suck air and run lean on the front cylinder the same as what can happen to the back seals, but it is supposed to be a sealed area at the front and there might not be any air to suck? It would depend how well it was built.

 

[SJBrit]

I was 99% sure it was a crank seal. I really was planning on doing a motor build next winter, because I refoamed and installed foothold this winter. So now that ive opened another can of worms what can I do to the engine? I want to keep it reliable and easy to start and not have to adjust the carbs to much. Send it out to be ported?

If you can afford to do it and you are tearing down anyway, then a port job will put a big smile on your face. But, it is indeed a can of worms, so as you are figuring out if you can afford to do that, then think about the extras. For example, I wouldn't want to run a 10 year old crank with a ported motor, so I'd be sending my crankshaft out for a rebuild. I'd also have to check to see if my prop is going to work with a motor with quite a bit more low end punch.

Just some things to think about.

 

[Sospikey]

I was 99% sure it was a crank seal. I really was planning on doing a motor build next winter, because I refoamed and installed foothold this winter. So now that ive opened another can of worms what can I do to the engine? I want to keep it reliable and easy to start and not have to adjust the carbs to much. Send it out to be ported?

You could just replace the seals and gaskets. Wouldn't cost more than $100 and your time. And maybe have the the cylinder and pistons checked. It could be a good idea with some new rings and a hone. There is plenty of life in an oem crank in a stock motor. Porting and such can wait, depending on your current setup.