H25A Lauson by Tecumseh

[FirePowerMinis]

For the Tecsperts; I picked up an H25A- 15-130, and wonder if any info is floating around about this little rascal.
It has a 5/8 shaft, likely home-made intake manifold, and what may be a welded cam.












A few I didn't grab. Verticals, B&S, stuff I didn't desire





50-60 year old Rambler V8/Gray Marine mill in decent nick. That's coming home.


An HS50 from couple days ago:

 

[tecumseh power]

Awesome! Great find.

 

[FirePowerMinis]

Awesome! Great find.

Thank you, Sir. I've wanted one for a long time, to see if it's adaptable to the HS50. This one's too nice to bastardize though, I feel.
I'm tossing out a WAG, this is an early 60's build?

 

[markus]

Yes early 60's, probably want to look for an HB25 or 30 with I think a 103 code, those were the ball bearing ones (they used the same bearing, seal, C clip as even the late model H and HS engines did) so in theory you could plug a ball bearing supported HS crankshaft in without mods to the sidecover or crank, I dunno if the oil pump will mesh with later model gears or anything like that though.

Is the crank and cam cross drilled? In the book it almost looks like the crank may have a passage from rod to case side, I would guess that the cam may be drilled through to feed the oil to the other side but I not real sure.

 

[FirePowerMinis]

Yes early 60's, probably want to look for an HB25 or 30 with I think a 103 code, those were the ball bearing ones (they used the same bearing, seal, C clip as even the late model H and HS engines did) so in theory you could plug a ball bearing supported HS crankshaft in without mods to the sidecover or crank, I dunno if the oil pump will mesh with later model gears or anything like that though.

Is the crank and cam cross drilled? In the book it almost looks like the crank may have a passage from rod to case side, I would guess that the cam may be drilled through to feed the oil to the other side but I not real sure.

Yes, the cam is through-drilled, and there's a jumper in the case to connect it to the crank bushing.
I didn't pull the crank, or even look to see if it was drilled to feed the rod from that side.
I figured, with pressure oiling, there's really no big gain in a ball bearing.

Thanks, guys! The knowledge base here on OldMiniBikes is tremendously helpful.