2n starts but only for a few seconds

jasond

Member
i have been doing alot of different checks, too many to list and i am now getting started, but only for a second up to maybe 10 seconds. once she does a start, it will not do it again for a few hours. no difference to throttle up or down. but when it is choked, the oil pressure rises w each crank up to 50.
of all the steps i have done i am unsure which step to go back to.
any suggestions?
thanks
 
" i have been doing alot of different checks,"

It would be helpful if you'd share a few of them.

As soon as it stops, will the spark jump a 1/4" gap in the open air?

As soon as it stops, what does the gas flow look like when you remove the bolt in the bottom of the carb?

As I said...as soon as it stops. Not a minute later.
75 Tips
 
tried the gas cap, no difference.

what i have done, checked points, replaced coil, cap, rotor, plugs, plug wires, braided ground strap, wire from battery and to starter.
checked spark on all 4, opened bottom of carb, dribbled at first, but cleaned screens and tapped bowl and now have a continuous flow out drain.

i will check for 1/4" on all plugs again. if not getting 1/4", what is responsible?
also going to hit all plugs w torch and check gap again, is there more i should do w the carb since it did have some issues?
 
" i will check for 1/4" on all plugs again. "

One plug will be fine; just be quick about it.

If it's not 1/4", the most likely cause given all that you've done is a weak battery. If the battery is fully charged, post back for other possibilities.

" also going to hit all plugs w torch "

Excellent idea.

" and now have a continuous flow out drain."

Doesn't matter. Check it again. Only open the gas 2 full turns; no more.
75 Tips
 
Next time you start it, have someone hold their hand near the exhaust and see if there is a good flow coming out of the pipe. I have had mice build nests and plug up the exhaust. Without a place for the exhaust to go, pressure backs up into the cylinder and it won't pull air into the cylinder on the intake stroke!
 
(quoted from post at 12:29:23 03/27/15) i have been doing alot of different checks, too many to list and i am now getting started, but only for a second up to maybe 10 seconds. once she does a start, it will not do it again for a few hours. no difference to throttle up or down. but when it is choked, the oil pressure rises w each crank up to 50.
of all the steps i have done i am unsure which step to go back to.
any suggestions?
thanks
ne to ten seconds is interesting. Note: just the carb bowl full of gas & fuel supply turned off/disconnected is enough to run the engine for more than 60 seconds.
 
went to town, expecting to get a battery but the battery tested ok, says was at 604cca, and its a napa 650cca so not too bad. bought a cheap hydrometer and all cells were good. going to get her back on the charger tonight.

tomorrow i will check the tailpipe and the spark and fuel, but justreally dont know whats up w her.

hope to get the new reaer tire on this week and be able to try and pull start, but i dont understand how pull start works if the tractor sti;ll needs a strong battery. dont know what a pull does that i cant get to happen currently

is it worth opening the carb and cleaning it thoroughly? i have a continuous flow but maybe i can get more flow?
 
" but i dont understand how pull start works if the tractor sti;ll needs a strong battery. dont know what a pull does that i cant get to happen currently"

The battery powers both the starter & the coil. By pull starting it, you are getting full battery power to the coil.

I'd leave the carb alone other than checking it for flow as soon as the engine stops.
75 Tips
 
what is responsible?

Answer the damm question... 1/4" spark do you have it are not...
if you are not sure buy a adjustable spark checker and use it when this event happens.. If you can not list all the checks you have made can you at the least play and answer one damm question...

Its a process of elimination the question will be evident once you determine cause and effect...
 
i DO have 1/4" spark, but i have not yet checked immediately after start attempt as bruce recomended. my battery is out and on
charge currently but i will do as told and check for spark fuel and tailpipe when i get it back in
 
Yes, i do have 1/4" of spark and fuel flow from the bottom of the carb immediately following start attempt.

also good pressure out the tailpipe while i try to start
 
If you have confirmed spark will jump 1/4" gap (not a guess) at the end of ALL the plug wires were they attach to the spark plug during your no start issue spark is notcher problem...

If you are guessing at the spark you are not helping those that are helping you you do have a adjustable spark checker don't you... I am a trained killer when it comes to spark issues I don't trust my guess and sure as ell don't trust anyone else's guess...



http://forums.yesterdaystractors.com/viewtopic.php?t=1170719&highlight=gap

Next I would spray some brake clean in the air inlet of the carb while crank'N... If fuel is a issue it will run on brake clean...

With all this crank"N has it wet the plugs...

On a side note I am not fond of cleaning plugs with anything be it a torch, wire brush are sand blast... I will sand blast for test purpose only spark plug cleaners are cheap and should be mandatory for a N owner (as a adjustable spark checker should be also) . If it gas fouls (wet with gas but otherwise plug looks good) brake clean are alcohol will clean it and dry quickly... When you torch it are wire brush it you may develop a conductive film that will cause the spark to follow the film to ground...

What did your plugs look like... Pick one

http://ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp
 
i did use an adjustable spark tester similar to your link. but on only one plug. the plugs were new but yesterday i pulled them
all and they definitely had a "wet foul" look.

i think tomorrow i will check spark on all 4, and then clean or replace all plugs.

unsure which is the air inlet hole on my marvel carb, sure its in the book, ill look
thanks
 

Its the big arse hole were the air cleaner tube connects to it... Air inlet to the carb...

Your issue is interesting because you state sometimes it will run for hours then has issues re-starting...

You broke a big barrier by using a adjustable spark checker I believe what you state.... That's a good thang.. Keep that checker in yer pocket we may need it....

If it wets the plugs with fuel it can suck... Have you taken a sample of the fuel in a clear jug to confirm you do not have water in the fuel...
 
few things. too late tonight to check all 4 and clean them, but brake kleen was doable w no result. but prob doesnt say much w
fouled plugs. strong suction though on that intake.

unfortunately, one thing you said was incorrect. i have not had her run for an extended period since the fall. 10 seconds at most
w full choke. in the fall, she ran fine, then this issue began. i tried to crank her prob mopre than i should have,it then the
next day when i had time to, i looked around her and i find i had an exploded coil. heard tht was prob due to leaving the key on.
maybe whatever exploded the coil is whats still an issue
thanks
 
" maybe whatever exploded the coil is whats still an issue "

The coil exploded because you left the key on. That's not your problem.

And, if you checked spark w/ an adjustable gap checker as soon as it stopped running & it jumped 1/4", then spark isn't your problem either as Hobo said.

Clean the plugs, charge the battery & start over. This time, lets deal w/ fuel issues.

While you're waiting for the battery to charge, drain a pint of gas into a clear jar & let it sit for 30 minutes or so. See water?

When you go to start it again, spray the brake cleaner directly into the carthroat w/ the engine turning over; do NOT use the choke.

Post back w/ results.
75 Tips
 
Whut he said...

Look at the choke flapper can you control it with the choke cable does it open and shut with your commands and stay put...

A simple compression check would rule out a mechanical issue with the engine are at the least resolve that issue for now...
 
i think you are on to something!! so checked spark on all 4 and verified 1/4". pulled each plug torched and wire brushed plugs.
drained the carb and then let the tank flow into a clear bottle and found some water! so while sediment bowl was off and carb was
dry, i sprayed brake kleen and she started right up like a beauty! did it agin and she ran great again. so i disturbed the tank
and ;let fuel run into a bucket but still some in the tank. connected her back up, and she is back to my original problem.

so.. how do clean out my tank and fuel system the best so i can replace w good clean fuel?
of course i just added 2.5 gal good new clean stuff the other day.

does a strong start and operation on brake kleen mean thta its completely a fuel issue?
thank you everyone!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
yes she runs on brake kleen!!
i replied to hobo w more info, im just now seeing many comments i hadnt seen
thanks so much
 

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