Troubles getting motor started

[Hellion]

Just to be sure, make sure you're not running the engine with the air cleaner and the recoil starter assembly/blower shroud off. The former is because (duh) engine damage from dirty air particles and the air cleaner affects the fuel-to-air mixture. It's basically running leaner with the air cleaner removed and so all carb adjustments should ideally be made with the air cleaner installed (unless you're an expert) to maintain consistency.

Don't do the latter because the forced-air cooling from the flywheel fan/blower is totally negated with the shroud removed. It will overheat unless of course you're running down the highway at a constant 30+/- MPH.

 

[Hellion]

Welp I mighta screwed that up I just grabbed the tiniest drill bit I had but when slow and straight possible

Tons of free information on the web on how to do this sort of thing. But some people are impatient, want it done NOW! or are deluded by the "it'll be fine" belief system.

So with that statement, the logical assumption is your engine is being absolutely flooded with more fuel than it knows what to do with. For most people, the smallest drill bit they have is 1/16".

 

[bob58o]

Is the intake upside down? I looked for other pictures of Tecumseh's and it seems like the fuel charge goes uphill through the intake to the port?

Maybe the uphill slope helps prevent the liquid fuel from entering the port? I think the design is strange, but maybe the uphill slope plus heat from proximity to exhaust pipe makes it work?

it seems every photo has the carb sitting right under the exhaust.

PS… I just realized this is a Briggs Flat head so maybe my Tecumseh references don’t help?

 

[panchothedog]

If the smallest bit you have is the standard 1/16" ( like most sets ) you better buy some more jets along with a set of micro drill bits. 1/16" = .0625, about double the size of what your engine is capable of using. The micro bit sets run from about .013" up to about .040". A spread big enough to cover main and pilot jets for most engines up to about 250 to 300 cc's

 

[John Roger]

sorry little late to the welcome but if it helps us drill start get a socket big enough and it helps starts out a lot just be sure you pull out the drill fast enough when the engine is started you you dint take off the bolt it a super good hack to help with an engine that needs tuning also clean up the spark system mainly the flywheel

 

[Thepartsguy]

Is that coil wire running to a headbolt? That will cut spark. The intake bend does not matter my intake length/bends setup is in the 9’s compared to that..

NO ONE EVER LOOKS AT THE VALVES.. Did you verify the 6thou intake gap and 9thou exhaust gap? It’s very common the intake lash goes to zero and holds the valve ever so slightly open. It’ll still start but run rich It will ALWAYS hard start. AND the rich condition wrecks the plug making a full no start.

 

[Thepartsguy]

sorry little late to the welcome but if it helps us drill start get a socket big enough and it helps starts out a lot just be sure you pull out the drill fast enough when the engine is started you you dint take off the bolt it a super good hack to help with an engine that needs tuning also clean up the spark system mainly the flywheel

I found a drill under the floor of a shed and freed up the chuck and got a one way clutch attachment. Works amazing as a kart starter. Now I’m making a case for it so it will look more like a kart starter.

 

[Denny]

That’s an old wrist breaker not a drill. Great units.

 

[Hellion]

Is the intake upside down? I looked for other pictures of Tecumseh's...

He's got a Breaks & Scrap 'Em, not a Tecumesh. Evidence is on the post where he submitted photos. A Briggs Fun Power to be precise.

EDIT: I didn't expect to see your edit where you recognize the engine's paternity. Disregard my admonishment.

 

[bob58o]

He's got a Breaks & Scrap 'Em, not a Tecumesh. Evidence is on the post where he submitted photos. A Briggs Fun Power to be precise.

EDIT: I didn't expect to see your edit where you recognize the engine's paternity. Disregard my admonishment.

the question still remains….
Is the intake upside down?

and is the intake from a tecumseh?

 

[Thepartsguy]

the question still remains….
Is the intake upside down?

and is the intake from a tecumseh?View attachment 151508

The intake is from a tecumseh and no it is not upside down. He needs to ditch that slide carb and the red intake it’s probably a vacuum leaking mess. A Tillotson HL will bolt up to that tec intake without that red clone intake.

 

[Thepartsguy]

That’s an old wrist breaker not a drill. Great units.

The chuck on this beast is glass smooth.

It has no ramp up squeeze the trigger and it’s max speed/power.. Gonna break a lot more then my wrists if it kicks.

 

[Hellion]

NO ONE EVER LOOKS AT THE VALVES..

Absolutely! Great point. A false sense of security emerged from the OP saying it WAS running then quit suddenly leading us to look elsewhere.
It could have simply lost valve clearance at that exact moment resulting in a sufficient loss of compression and a no-start situation.

Do what he said, folks. Look at the valves.

Do a compression test (with a gauge), or put your thumb over the spark plug hole and do it by feel.

 

[bob58o]

The intake is from a tecumseh and no it is not upside down. He needs to ditch that slide carb and the red intake it’s probably a vacuum leaking mess. A Tillotson HL will bolt up to that tec intake without that red clone intake. View attachment 151509

That photo with the red intake was just an example I found of a Briggs using a similar intake to show the carb is below the port. Not OP’s engine…

Your photo shows the intake is upside down in one of the two photos… ??? The OP’s or yours? The photo you showed has the intake “manifold” set so the carb is below the port… the way I suggested it should be. His photo has the carb above the port… I assume Tecumseh didn’t engineer this part to be used in both directions…

Just saying that in my exhaustive 100 second scouring of the interwebs… OP has the only set up using a Tecumseh manifold where the carb is above the port.

 

[Thepartsguy]

Both of these pictures are mine.
Picture one is a direct match of op’s

Picture two is also a tec intake

Intake in picture two ABSOLUTELY CAN be flipped and that would stick the carburetor up beside the head bolts.

There are like 7 different kinds of these tec intakes that will bolt a tilly to a briggs/tec easily.

A slide carb has a flange that is bigger then the tec intake. The red tube in your found picture was the fix for the flange mismatch. Edit: Third picture stolen from the forums to show the intake flip.

 

[bob58o]

I can see how hogging out that jet could be an issue now. Also I think I was attempting RC Nitro fuel when I was throwing jets at my engine. lol. The intake shape plus downward slope and hogged out jet is probably pouring gas into the port. Let’s see what the spark plug looks like.

I don’t have experience with these engines but Id go through the normal process of checking for spark, compression, fuel, valve timing/operation, spark timing…. as has been suggested.

 

[Thepartsguy]

I can see how hogging out that jet could be an issue now. Also I think I was attempting RC Nitro fuel when I was throwing jets at my engine. lol. The intake shape plus downward slope and hogged out jet is probably pouring gas into the port. Let’s see what the spark plug looks like.

I don’t have experience with these engines but Id go through the normal process of checking for spark, compression, fuel, valve timing/operation, spark timing…. as has been suggested.

I have never been able to make a slide carburetor on a tec intake reliable. Moved to $13 ebay tillys and no more trouble.

 

[Hellion]

Hope the OP comes back.

Moved to $13 ebay tillys and no more trouble.

The slide carburetor Mikuni cult rules the go kart/minibike fanbase, based mostly on myths and that one should not accept any substitute for this mechanical marvel. The myth seems to persist merely on the basis that if it's on a fast motorcycle then my go kart will be similarly as fast.

The Tillotsons are good though and basically foolproof in my limited experience. A $13 Tilly? Show me where.

 

[Thepartsguy]

Purchased a few of them and waited for the slow boat to et them to the states then to my door. If you wanted one shipped in 3-6 days like normal there about $17

it’s the HL324A I remove the choke plate and prime it with a spray bottle. Awesome carburetors. Never got the high rpm’s out of a slide like I do these little china junkers