Tecumseh 5hp cant get started !!!

[mrbeggs432]

Those engines have a built de-compression relief in the cam, so they spin over easy. Did you ever try starting fluid or gas in the carb instead of carb cleaner.
Despite what's in it, I've seen a lot of carb cleaner that will not start an engine.

I took it off the bench in frustration....will put it back on and try the starter fluid directly into the intake......will update on results....thanks

 

[Xtreme Yard Karts]

I took it off the bench in frustration....will put it back on and try the starter fluid directly into the intake......will update on results....thanks

That would at least eliminate one factor. I've shot a little small shot of starting fluid intake of junkyard motors with no carb or tank in place to see if they run since I was a kid. If it's got compression and fire it will come to life for a second.

 

[Nosandwich]

Please excuse my ignorance......cam on the base circle ??? Do you mean when the lifter comes up and pushes on the rocker to its fullist ? or when it goes all the way down and no pressure on the rocker arm ? Im more of a fabricator then a mechanic....but, I just bought a shiny new feeler gauge from Harbor Freight !

---------- Post added at 04:55 PM ---------- Previous post was at 04:03 PM ----------




Not sure if I was doin it right....watched a youtube video on a overhead cam Briggs.
It showed rotating the motor until one valve spring bottomed out and then measure the opposite one's clearance...I came up with 0.15 on the exhaust side & .030 on the other....is this being done right ?

No...they should both be be loose, with the engine on the compression stroke.

 

[mrbeggs432]

Those engines have a built de-compression relief in the cam, so they spin over easy. Did you ever try starting fluid or gas in the carb instead of carb cleaner.
Despite what's in it, I've seen a lot of carb cleaner that will not start an engine.

I give up I have tried all input on my thread....last n final did try removing carb n shooting starter fluid up into intake.......nothing.....removed plug still getting spark.....put a different new plug checked for spark before trying to fire again with fluid....nothing....Don't know if I have good or weak spark....frustrated as heck !

 

[BeaterofAincrad]

I feel your pain, I had a weed eater sitting there for about a year and a half. Tried 2 new carbs(ofc had spark, etc.). Earlier this week I finally gave in and took the shroud off and found that one of the bolts to hold the cylinder on was a little loose. I(painfully) put it all back together and it fired up after a few pulls.

Again I had a ride on I was going to fix and give to an elderly person. It kept surging, got a new carb, it was the wrong one but had the possibility it would work. Sat there for almost 2 summers, came back to it last weekend and I used/tested it to mow our lawn today.

I had no intention of giving up but sometimes you just have to come back to it.

However if you REALLY don’t want to deal with it anymore, I’m up for a challenge, I can send you my address. I’ll take it off your shoulders, buy it, or try to fix it for you. If you want I can see what I can do and send it back if/when I get it working. I’m prolly not the most qualified/experienced especially on the inner makings(that’s what DIYgokarts & YouTube is for) but if I do charge it won’t be anywhere close to what small engine mechanics charge up here.

Sorry if the comment was too long, tried to get my point across effectively.

 

[bob58o]

Bent exhaust valve stuck open from running without exhaust?
?Just looking at the pic?
Take the valve cover off and have a looks.

 

[mrbeggs432]

Those engines have a built de-compression relief in the cam, so they spin over easy. Did you ever try starting fluid or gas in the carb instead of carb cleaner.
Despite what's in it, I've seen a lot of carb cleaner that will not start an engine.

Yes used starter fluid and tried 2 different new plugs gapped properly showing spark....sprayed fluid directly up into manifold.....nothing !

---------- Post added at 11:17 AM ---------- Previous post was at 11:09 AM ----------

Bent exhaust valve stuck open from running without exhaust?
?Just looking at the pic?
Take the valve cover off and have a looks.

I never had it running....it was never started without exhaust on......I took valve cover off and checked the clearance....but...didn't remove or check valves

 

[ezcome-ezgo]

Sounds like the Curse of Teckasheema.

 

[bob58o]

I never had it running....it was never started without exhaust on......I took valve cover off and checked the clearance....but...didn't remove or check valves

OK, I just didn't see an exhaust in the pictures.

If there was one on there and both valves seem to operate correctly when you slowly pull the cord then I guess that's out.

There seems to be lots of rust on the flywheel and ignition coil. Clean it up, set coil gap to 0.015", and try again? Other than that, if it wasn't a Tecumseh, and I was determined to get it started, my next test would be a leak down test.

A harbor freight compression tester can be converter to a leak down tester. There is a Youtube video for it.

 

[BeaterofAincrad]

Could it be the governor isn’t set correctly? Whether it be on the shaft that goes into the engine block or the throttle spring?

I don’t think it could be those but it seems like it’s worth a try at this point.

 

[Nosandwich]

Your valve lash is set on the EXHAUST stroke, set it on the compression stroke at TDC, and it'll run.

 

[mrbeggs432]

Your valve lash is set on the EXHAUST stroke, set it on the compression stroke at TDC, and it'll run.

what do I look for to make sure im TDC on the compression stroke and not the other ??

When I set the first time ...on one of the TDC's both sides were loose and sloppy...thats when I set them to .004 or whatever I said in previous quote

 

[bob58o]

I guess I'll quote myself.... LOL
It sounds like you might have set them correctly, but worth checking again.

While pulling the cord slowly with the spark plug out, watch the valves and the piston (through the spark plug hole).

Piston Moves Down while intake rocker/spring/valve is moving = intake stroke
Piston Moves Up while both valves are still = compression stroke
Piston Moves Down while both valves are still = power stroke
Piston Moves Up while exhaust rocker/spring/valve is moving = exhaust stroke

Turn the engine over a bunch of times until you identify each stroke.
Call them out as you see them.
Intake, Compression, Power, Exhaust, Intake Compression, Power, Exhaust,.....
In between the compression and power stroke, when the piston is as high in the cylinder as it will go (TDC, Top Dead Center), THIS IS WHERE TO SET THE LASH.

The other time the piston is at TDC is when the exhaust stroke turns into the intake stroke.
Both valves will be moving around TDC and you cannot set lash here. The lifters need to be on the base circle (NOT THE CAM LOBES)