Me too! If it works, the next prototype will need some additonal case trenching on the clutch side to case match the transfers.
And when I pressure vac tested last night and had a small leak around the crank bushing, so I've pulled the seal and bushing out and did a small amount of 1184 around the base (as I don't have the overpriced o-ring)
Looking at 385/390, there’s no bushing. The oil gear just rides on the pump. Seems like that would overheat the gear, but it would eliminate the bushing/o-ring/seal problem. Could you do that with a tighter ID seal?
Yeah, I don't have an actual 385/390 to reference but from what I can tell in my research they changed their bearing style to move to an integrated seal (like the 562 series saws.)
Parts arrived over my lunch break! I installed the new seal and it is now holding pressure/vaccuum. So I started pulling the rest of the parts out to finish the build.
Alright. after searching through the bins for a bunch of random parts along the way... Got it together. I have a couple parts that still need to be ordered.
But first fire is a success!
Long form vid (skip to 45 seconds if you don't want to see me yarding away on it...)
- I didn't hear it when I was running it but I hear some knocking in the vid that I *think* (hope) is the air duct/deflector hitting... the flywheel... it was aftermarket didn't seem to sit flush and I was not sure how it would go.
- Carb is not tuned & the throttle cable was sticking open slightly. I've remediedt that but ran out of daylight.
Near the end of the vid I was getting some weird spitback firing issues that I assumed was carb related so after it it died a couple times I stopped so I could pull the muffler to see how the piston looked, check bolts (and now that I've listened to the vid, try and find the source of that knock)
Still seems to pull over ok and piston looks good with no scoring (yet)
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