Got gas, got spark, no start

[Beauford]

Chassis started yesterday but will not today. I have spark at coil and plug. Cleaned carb (new Tilly) again. Using a new lawn mower plastic tank as a temp. Turn on, Retard, Pull choke for a few revs with GAV opened half, push in choke, crank and no start. Waiting for battery to charge up again.

[Mitch]

are you getting fuel to the carb? if so unscrew the drain plug to see if fuel runs out....
make sure the fuel line is not to far past the ferrule, I like about a 1/6th

[Beauford]

I checked bowl and yes there is gas. She started this time but she sputters. Give it some throttle and she cuts out.

[Beauford]

Gav helps a little...should I mess with air screw?

[Beauford]

I did time it again....thought I'd try the Nu-Rex method.

[Patrick]

So, was the 'Nu-rex' method the reason it started or didn't start ? And, yes, the idle mixture usually needs adjusting. GAV, I don't know what opened 1/2 means.[ Does it mean 1/2 turn or 1/2 way]. Tilly's require opening the GAV generally more than Zeniths. They normally need 1/2-1 turn out [ ccw] when warm which means an extra turn out for a cold start. Make sure the 2 venturi ports are clean as well as those in the main jet. That jet can be a royal PITA to remove sometimes.

[vfrhugh]

Beauford,
I have a Tilly that won't run less than 3/4 turn out on the GAV. I know you'll hear a lot about number of turns out on the gav but what really matters is the fuel to air ratio. Number of turns is relevant to each individual carb. These things are 80 years old and probably out of spec. You've got the right idea about fuel, O2, & fire. All the engine knows is when the mixture is around 14:1 (also timed correctly) she's going to run. Stay with it and it will seem simply when you figure out what's missing,
good luck,
Hugh

[Mitch]

when Tom W has time we are going to hopefully get a nice easy tutorial with pics of setting the timing easy and properly.

im not saying u didn't do it right, just mentioning something that would be nice for forum reference


I usually go 1 to 1 1/2 out on the GAV for a cold start

[tbirdtbird]

sounds lean....something clogged somewhere.
Take fuel line off carb, open gas valve, and see if you can get a really good stream.

Also, it never hurts to mess with the GAV, let'er rip, open it up, once it starts and warms up you can dial it back until you find the sweet spot. The GAV enrichens all the jets in the carb.....

what happens if you hold the choke out a little bit to enrichen in that manner??? Try that before anything else I've said

fresh gas we presume

i had a tiny spec of crap jam my needle and seat on a tour, had to pull off the road by holding the choke nearly all the way out. Removed carb, started investigating, and yikes a small piece to crud fell out into my hand when I unscrewed the float valve. Thankfully an easy fix. My tank is clean, too

[vfrhugh]

All you ever need to know about a Tilly
https://sites.google.com/site/mrtexa...ly-carburetors

[Beauford]

About to take a 10lbs sledge to this Tilly.....now its dripping gas out the intake. Waiting on battery to charge...Don't know how old gas is but my Cub cadet fires right up.

[Mitch]

we check for bad gas at the shop by pouring a sample on the concrete floor and lighting it.
then look for a nice burn with no residue leftover. (smiley face)

[Beauford]

So, was the 'Nu-rex' method the reason it started or didn't start ? And, yes, the idle mixture usually needs adjusting. GAV, I don't know what opened 1/2 means.[ Does it mean 1/2 turn or 1/2 way]. Tilly's require opening the GAV generally more than Zeniths. They normally need 1/2-1 turn out [ ccw] when warm which means an extra turn out for a cold start. Make sure the 2 venturi ports are clean as well as those in the main jet. That jet can be a royal PITA to remove sometimes.

No, I had just bout the Nu-Rex months ago and thought I would re-time to see if that would do anything. It did not and was timed correctly before that. It has to be a fuel problem. Fellow A'er has a tilly up the street. Maybe he can figure it out. Pretty simple freak'n carb....

[Beauford]

I blew whatever out....does this sound right? I adjusted a few things.

https://youtu.be/cv_LvU1vxwA

[tbirdtbird]

sounds good.....maybe a bit late (retarded) ...where was spark lever for this vid.
A late motor will sound louder than one correctly timed. You get used to the different sounds....

[Beauford]

It wasnt at the 3/4. I started it again this morning and went to 3/4's and it seemed to like it.

[Beauford]

When you drive these cars, do I assume you mess with spark adjustment with the RPM's? Can I just position it about two clicks down and leave it?

[tbirdtbird]

"I assume you mess with spark adjustment with the RPM's"

correct. If you leave it 2 clicks down at all times it will be retarded for most of your drive and the motor will overheat quite quickly. A retarded motor can come to a boil in about 5 min. Pretty impressive, actually

Most usually run about 3/4 of the way down most of the time, and retard it a bit going up steep hills. Different owners will have slightly diff. techniques

[Beauford]

Well, Tbird, your great knowledge has spread across two forums! You sir have solved yet another puzzle. Maybe that is why my engne runs hot.....I will do as you suggest on my Sunday chassis drive alluding the police! Thanks!

[Mike V. Florida]

when Tom W has time we are going to hopefully get a nice easy tutorial with pics of setting the timing easy and properly.

im not saying u didn't do it right, just mentioning something that would be nice for forum reference


I usually go 1 to 1 1/2 out on the GAV for a cold start

In the mean time take a look here,