Engine test stand

[squonk 41,153]

I'll try to make this as short a story as I can. @D_Mac needed an engine for his 875. Figured they would be some at the show. Bought an " Allegedly Rebuilt" K-181 off a FB ad to be picked up at the show. Ad says engine will run. Friday comes and 2 kids say we got you engine. They take me to it and it looks like it came out of the junkyard. Kid says he put a new piston, rings, rod ect. in it but he can't get it to run. Thought it was in the valves. Well I already paid for the thing sop I took it. Ended up buying another engine for Don that looked like it was a good engine. Bought it from a collector who took it off a tractor to put a Twin cyl on and make a hot rod.

 

So I got this other engine. No room for a roller even here but I got the idea to build a test stand. I knew where there was a frame "hanging" around @rjg854 and I had a bunch of strut taking up space and a box of wire. all I needed was some brackets, electrical boxes and bolts. I will clamp this rig to my hydraulic lift table. When I'm not using it 4 bolts and it will hang in the shed

 

Commando frame with the first piece of strut and battery box I got at the show:

 

Electrical box for key and "IDOT " light:

 

Junkyard dog:

 

Gas tank picked up at the show rigged up:

 

Electrical and throttle control mounted:

 

All finished:

 

 

Cranked the engine over and yup it blows out of the carb when it fires. I will continue in this thread as I progress to get this running. First step will be valve timing and lash

 

 

[peter lena 8,634]

@squonk like the idea of a test bed set up, just being able to break in or detail a running engine is the way to go . my experience was fuel , lubrication and electrical detailing. always noticed a gain on response  , smoother running , my first oil changes were , showing me a clean up , electrical upgrades every step. running on seafoam , the transition  was obvious . just the opposite of its previous life , pete  

[D_Mac 8,621]

Thanks again for the engine Mike. Will a Tecumseh Engine fit on there ???

[squonk 41,153]

10 minutes ago, D_Mac said:

Thanks again for the engine Mike. Will a Tecumseh Engine fit on there ???

I have a scrap pile started. 

[D_Mac 8,621]

I had to bring the 500 to a friend's house. I don't have everything needed to pull the flywheel off that engine. When we get that one running AGAIN I will start the engine swap on the 875 with the one you brought me. Still looking for that steering bracket too.

[953 nut 55,316]

1 hour ago, squonk said:

First step will be valve timing and lash

Ignition timing too!

[squonk 41,153]

Ignition timing was the first thing I checked. Appears to be correct. I do have some air leakage back thru the intake port when I pressurized  the cylinder at TDC.

[ebinmaine 67,605]

Very nice work on that stand Mike. 

 

I'll be looking forward to hearing what makes that engine go "right". 

 

 

[squonk 41,153]

Recheck the ignition timing. Points Start to open very late. If I try to adjust the points so they begin to open while the S mark is lined up with the plate line, the points never close to re-establish the primary coil circuit. I think I have to tear into this engine because the cam timing is off. 

[D_Mac 8,621]

well when you run out of engines I have a couple here !!