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Engine basics => Engine set up tips => Topic started by: Paul Taylor on October 28, 2006, 01:51:25 PM
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I have a new Veco .19 and I am in the process of trying to break it in.
History:
I had some problems with the needle at first, it was still in the package. When I tried to screw it in, it would only go about 3 turns before it seem to bottom out. Some one said to check to in sure the NVA was not plugged. It was not. I figured what the heck, it is not working as it is so I took some pliers and screwed it in. It now will go about 9 turns in and seems to close because I can not blow air thru the NVA when closed.
So I put 2 oz of 5/29 Lou's brew in the tank, wood 9x4 rev up prop cut down to 8x4 for break in. Good plug. It will start and blubber for about ~20 seconds, then go lean and shut down. Like it stops pulling fuel? ???
From then on it seems to just run the prime and then quits.
I am thinking air leaks? (new fuel line was no help)
How about a little help from my friends? y1
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How far out is the needle ?? It is getting fuel ?? Those little %^&*#@@ buggers flood easy. I've got one and I wouldn't give 2 cents for another. I hope yours works better.
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My first guess would be a problem with the NVA. Take the whole thing out and look it over good. Maybe it is misthreaded. Maybe there is a piece of flashing in it. Maybe the needle itself is loose, whatever. If you can't find anything wrong, put it back in. I presume the engine draws fuel through the fuel line when you choke it with the Needle open some. If not, there is your problem. Also check that the back plate is tight and the gasket is OK. Also head bolts. If it still won't work, swap out the NVA and put in an ST and hopefully it will run.
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Thanks Guys,
I did check the back plate screws and it got about 1/8 to 1/4 turn on them. Same with two of the head bolts. I still get about the same thing when I try and run it.
Jim, you know what size ST needle it would take?
Thanks
Paul
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Hi Paul,
I love a Veco 19! If you don't have any success, send it down my way and I will get it running for you. Only the cost of shipping! y1
Bill <><
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Make sure you have a OPEN vent in your tank or the engine will refuse to draw fuel no matter how open the needle .
Ask me how I know.(on the test stand, failed to unplug vents). The vents were plugged to keep dirt out of tank while not in use.
It will draw air thru the needle Spraybar hole when the eng. is at rest and run a short time till the lack of air in the tank stops fuel flow.
Pay attention guys ; This is not a rare thing.
I have seen this problem many times in weed eaters and chain saws,and
blowers. Some vent thru the cap some have a sealed cap and vent(draw air)
thru a tube and filter.
Put the non vented cap on a unit that is supposed to draw air thru the cap
and it will drive you crazy.
Starts rich goes lean ,sags and quits; just like a partially cogged fuel filter
that pulls trash together and does the same thing.
While your poo-pooing;Be advised top fueler dragsters have had :Xthe same
cause and effect on their machines, in the not too distant past
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Paul,
Frequently when first beginning to run an engine in, it will heat up excessively in the first 20 or 30 seconds of running, and die. The next time you try to run it and it does this, reach over and grab the head. You probably won't be hanging onto it very long. Now it's hot and tight and it's going to eat the prime, heat up some more and die again. From what I've observed taking temperature readings on engines for the past couple of months, they die when the head temp reaches about 230-240 degrees F. Most engines run between 160 and 185 degrees F. Some Fox 35's act the same way for the first few ounces of fuel, and need to be run in very short bursts in the beginning.
Patience, and make sure your tank is not way below your venturi.