GAB Version CHEAP.0 Tecumseh OHH50 172cc 5HP

[bob58o]

Next is the jetting.
I'll take the plug out and have a look.
I used to have to to keep priming the carb during warm up.
There is no real choke. It was a piece of plastic that needed to be moved around. Requires removing air box cover.

So I'm guessing the idle was lean?
Maybe it was correct for a warm engine, so lean when cold?

Either way, I'm guessing the idle and main will need to be opened up with the new intake and exhaust.

 

[bob58o]

I hope y'all didn't go out and buy the E3.18 plug just yet....

 

[bob58o]

Here is the old.
No WOT cut off, just regular use. Was idling before killed.

 

[bob58o]

Center electrode

 

[bob58o]

E3.12
Not E3.18

Is the replacement for what was in there which was
NGK / Torch BM6A

When I search for OHH50 plugs I get


Champion RN4C

19mm thread reach.

The one that was in there was 9.5mm thread reach??


Why use the shorty????
More compression with the longer one right???
I wonder if both could fit??

---------- Post added at 01:32 PM ---------- Previous post was at 01:30 PM ----------

Looks like some sort of built in indexing / gapping thing on the E3?

 

[bob58o]

Bowl Screw / Jet / E-tube

I think mine will look like this.
http://outdoorpowerinfo.com/repairs/tecumseh_carb_640017.asp

 

[bob58o]

Float and Needle Valve

Float and Needle

 

[bob58o]

Seat for Needle Valve

Please take your seats, the show is about to begin.

Please turn off all electronic devices. Oh wait....

 

[bob58o]

Low Speed Mix Adjustment Screw

Idle Mix Adjustment Screw

 

[bob58o]

Idle Jet

Role Model, errrr....

Idle

 

[bob58o]

Primer Vent

Primer Vent Hole

 

[bob58o]

Idle Fuel Passage

Idle Fuel Passage

 

[bob58o]

Main Nozzle and Transition Holes

Main nozzle and transition holes (behind the welch plug)

 

[bob58o]

I think mine will look like this.
http://outdoorpowerinfo.com/repairs/tecumseh_carb_640017.asp

My bowl screw says 191.

No way it is 1.91 mm

Maybe 0.91mm

which is 0.0358"

^ Seems right.
The .036" barely scraped anything.

I went 0.037"!

---------- Post added at 03:50 PM ---------- Previous post was at 03:45 PM ----------

Well the brunette who stopped talking to me, stopped talking to me cause the one who beat me up posted us on Snapchat.

I just started talking to the brunette again.

The brunettes Mom just called me and asked me to pick up and take care of the one who beat me up. I guess she is drunk somewhere. LOL

Here's the kicker.
The brunette who told me her and her kids father are broken up is planning on closing on a house in Indiana with her kid's father.

WTF.

Not sure who is more nuts? Me or the girls that let me touch their butt?

 

[bob58o]

The pilot jet is tiny.
My 0.018 inch drill bit doesn't come close to fitting.
It's my smallest bit I think???

 

[bob58o]

Sometimes the Crazy I joke about gets very real, very quick.

Sometimes life gets serious, even when you don't want it to.
This is why I don't answer phone calls.
F'd up stuff to ruin what was an awesome day.

 

[chancer]

DO NOT PICK UP THE DRUNKEN PSYCHO BLOND!
https://www.youtube.com/watch?v=FHSFMG8YNw0

 

[bob58o]

DO NOT PICK UP THE DRUNKEN PSYCHO BLOND!
https://www.youtube.com/watch?v=FHSFMG8YNw0

Somebody has to.

---------- Post added at 08:22 PM ---------- Previous post was at 08:05 PM ----------

So back to taking apart perfectly working stuff and breaking it via GAB.

If you want to get the pilot out, you got to take the carb off.
You can take off the manifold or just the carb.

Either way, got to pull off the fuel line.

FUEL LINE BROKE AT THE INLET TO THE CARB!

I haven't taken the fan shroud off yet. I heard the fuel line is routed behind the flywheel and the flywheel need removing. Hoping the line is still long enough, but probably needs replacing anyhow if it just broke like that. If the flywheel comes off, you can witness me destroying a perfectly good flywheel key.

So to remove the manifold from the head (I went that route, the other bolts seemed more hidden)
...
A SCREWDRIVER (DRIVE) IS NEEDED! NO WRENCH OR SOCKET I OWN WILL FIT AROUND ONE OF THE HEX HEADS (it is too close to the manifold. That's why it has a Phillips Head Hex top I now know.

It came off kinda easy just using a phillips-head screw driver and pair of pliers to get some leverage.

A trip to HobbyTown USA and I am $2 poorer, but I own 0.016" and 0.018" drill bits (in case I don't already). The pilot was close to 0.016".

Now it is 0.018"

 

[bob58o]

To Recap...
So Far...

1.
E3.12 Shorty Spark Plug vs BM6A Shorty Spark Plug
$6.00

2.
Air Filter / Air Filter Adapter vs Stock Air Box
$30.00

3.
0.85" ID x 23" Long Open Exhaust (3 x 45 degree bends) vs stock muffler
$35.00

4.
0.037" vs 0.036" Main Jet
$1

5.
0.018" vs 0.016" Pilot Jet
$1

 

[bob58o]

So I didn't really know what to do with the jets.

I ASSUMED that the Air Filter and Exhaust will improve flow.
But the carb is tiny and the intake manifold may be restrictive as well.

Going from 0.016" to 0.018" on the pilot.

0.016" / 2 = 0.008" Radius
3.14*0.008*0.008 = 0.0002016 sq inches

0.018" / 2 = 0.009" Radius
3.14*0.009*0.009 = 0.0002545 sq inches

[(0.0002545 - 0.0002016) / 0.0002016 ]*100 = 26% More Pilot Jet Area than before.

THAT IS ONE BIT SIZE BIGGER (FROM A 78 -77, TWO THOUSANDTHS OF AN INCH, 26% INCREASE IN JET OPENING AREA)


Going form a 0.036" to a 0.037" Main jet..

0.036/2 = 0.018"
3.14*0.018*0.018 = 0.00101736

0.037/2 = 0.0185"
3.14*0.0185*0.0185= 0.00107521

[(0.00107521 - 0.00101736) / 0.00101736] * 100 = 5.7% More Main Jet Area than Before

AGAIN, ONE DRILL BIT SIZE LARGER (FROM 64 TO 63), SAME TWO THOUSANDTHS OF AN INCH, THIS TIME ONLY 5.7% INCREASE IN MAIN JET OPENING AREA.