Subaru Robin EX17 wont start

[Brianator]

is the flywheel key sheared?

I was wondering that myself. Even a partially sheared key can throw timing off JUST enough to mess with you... been there, suffered that! Something you can try quick is remove the pull start and spin the flywheel backwards into compression, this bypasses the compression release. If it has enough compression that it bounces back it SHOULD have enough to run. REMOVE THE SPARK PLUG BOOT TO BE SAFE! Did you get to checking the piston rings for sticking and wear?

 

[gunlvr1974]

I don’t believe the key is sheared off. The flywheel spins, the piston moves, the output shaft spins. What would be a sign of a sheared key?

 

[Brianator]

An engine that wont start and possibly backfire due to improper spark timing.

 

[gunlvr1974]

The output pulley and the flywheel spin when I pull the rope. How would I know if the flywheel key was sheared?

---------- Post added at 09:53 PM ---------- Previous post was at 09:52 PM ----------

No backfire. Just dead when I pull the rope. Put fuel in on top of the piston and still nothing.

 

[Brianator]

Going to have to do a visual to be sure. Once you remove the flywheel nut/bolt you should be able to see if its intact or not. Picture illustrates a fully sheared key but even a partially sheared key could cause a no start.

 

[gunlvr1974]

Doesn’t seem like much compression

I’m spinning the flywheel counter clock wise like recommended. Doesn’t seem to have much bounce back. Just kind of spins easily. I tried to load a video but I could get it to load. I haven’t removed the flywheel yet to see if the key is sheared. I’ll need to find a puller first.

 

[landuse]

I’m spinning the flywheel counter clock wise like recommended. Doesn’t seem to have much bounce back. Just kind of spins easily. I tried to load a video but I could get it to load. I haven’t removed the flywheel yet to see if the key is sheared. I’ll need to find a puller first.

To upload vids, post them to youtube and link them here

 

[Brianator]

When spinning backwards you want to kind of "throw" it off the point of compression, if it bounces back it should have enough compression to run. You don't necessarily need a puller, there's more than one way to skin a cat!