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  #1 (permalink)  
Old 06-04-2017, 09:17 AM
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113ci S&S won't start

Whassup fella's, I'm new and lookin for any help I can get troubleshooting.

I picked up a mint custom pro-street last year and it ran pretty decent all year.
It's a 2005 113ci S&S with a Super E carb. It ran pretty good all season last year but
had a few hiccups with vapor lock. Nothing major, choked out on me a few times and had to sit and pressurize the tank to get it running again.

Fast forward to Spring, and I can't get the bike started.
1. Killed battery 4x already and recharged.
2. Used carb start, with no success.
3. Push pressure releases at top of cylinders (not sure how often it has to be done)
4. Just replaced the spark plugs, front one was fouled. Put in NGK BRP 4ES gapped @ .40
5. Still won't fire at all, even with carb start.

Any ideas on what I should begin with ??
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  #2 (permalink)  
Old 06-05-2017, 07:28 AM
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Had the same problem this spring. pull your plugs and see if there is spark i.e. ground the plug on the engine with the spark plug wire still on it and hit the starter button and see if you get any spark at the plug. If you don't get spark then you will have to check out the ignition system going through a troubleshooting list. if you have spark then it is probably a fuel issue. I had exactly the same issue and I had spark so i rebuilt my carb, put on a new Pingel highflow fuel filter and went to a larger intermediate jet as my jet was way smaller than the one suggested by S&S. I put the carb back on my bike and it started up first try. S&S has a great technical section on their website showing how to dial in your carb etc.
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Old 06-05-2017, 10:32 AM
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Like Mr. Christok mentioned, you gotta have spark...gas ...compression......and she will at least pop...if timing is correct. are you sure you are getting vapor lock? Maybe your vent hole clogged..vapor lock is rare.....push compression releases down, but make sure they are not popping back up if not firing..mine do that and it makes starting difficult so I have to hold both down while cranking..until it cranks..and check to see if you have gas in the bowl...unscrew the screw on the bottom of the carb and see i f you have gas.....also you have said that it choked out on you,
if it choked out on you then there is gas in the carb...maybe running out..according to your description, that sounds more reasonable......spark gas...compression...but should still crank with compression releases held down..
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Old 06-05-2017, 07:28 PM
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Quote:
Originally Posted by christok View Post
Had the same problem this spring. pull your plugs and see if there is spark i.e. ground the plug on the engine with the spark plug wire still on it and hit the starter button and see if you get any spark at the plug. If you don't get spark then you will have to check out the ignition system going through a troubleshooting list. if you have spark then it is probably a fuel issue. I had exactly the same issue and I had spark so i rebuilt my carb, put on a new Pingel highflow fuel filter and went to a larger intermediate jet as my jet was way smaller than the one suggested by S&S. I put the carb back on my bike and it started up first try. S&S has a great technical section on their website showing how to dial in your carb etc.
Yeah I gotta start with spark, and go from there. Thanks for the tips brother.

My Harley I was spoiled with FI so this is just a little learning curve til I get acquainted enough to it.

Quote:
Originally Posted by Shovel52 View Post
Like Mr. Christok mentioned, you gotta have spark...gas ...compression......and she will at least pop...if timing is correct. are you sure you you are getting vapor lock? Maybe your vent hole clogged..vapor lock is rare.....push compression releases down, but make sure they are not popping back up if not firing..mine do that and it makes starting difficult so I have to hold both down while cranking..until it cranks..and check to see if you have gas in the bowl...unscrew the screw on the bottom and see i f you have gas.....also you have said that it choked out on you,
if it choked out on you then there is gas in the carb...maybe running out..according to your description, that sounds more reasonable......spark gas...compression...but should still crank with compression releases held down..
I'm not sure what your first question is talking about....maybe my vent hole clogged??
Which vent hole are you referring to ??? Mind you I'm NOT savvy with these releases on top of the cylinders and I read there's supposed to be breathers elsewhere I'm still trying to identify.

As for when I said it choked out on me, It was a warm day out, and I had enough gas. I pulled over because it died (2x different days) an enthusiast walks up and blew into the tank covering the hole to pressurize it and push fuel into the bowls. I'll be damned but it worked, and taught me something I never knew before. So the 2nd time it died on me, I did this again, and it worked. That time was at night, and it wasn't hot out so I'm still trying to figure that out. Any help to ID areas to investigate, consider me a newb because I'm NOT that experienced yet.

I've rewired cars, put LS1's in classics, but I'm not 100% savvy on these systems yet.
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Old 06-05-2017, 10:57 PM
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It could be a weak battery. Even though the bike cranks over if the battery drops to under 11 volts while cranking the ignition won't fire. I'd start by checking for spark. But it may not drop as much without plugs in the engine. The best way to be certain is use a volt meter while trying to start it. If the battery drops 2 volts or more replace it
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Old 06-06-2017, 07:41 PM
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Your gas cap should have some type of vent hole. Back in he old days they just had a hole in the middle of the cap, but the new custom stuff have different type of vents. anyway you have to have some way for your gas tank to breath or you get AIR lock,...(trapped Air in the top of the tank is holding gas up)..........not vapor lock....where the gas vaporizes..somewhere in the system, from heat........fuel line sitting on top of the engine maybe???........ different animals......but if you have air lock ....no vent....then you have no gas flow, this could be why blowing in the tank fixed the problem.....I would check your spark first as described above by pushrod..then gas, since you were spraying starting fluid into the carb with no results...Also if it is air lock , then just opening the cap shoud let gas flow..you wouldn't even have to blow into it.....vapor lock is still possible...(vapor is locked somewhere in between the gas tank and carb).....but you need an extreme amount of heat in the right place. I had a lawn mower that did it , so don't rule it out.

Breathers..probably referring to crankcase breathers..They vent the crankcase through the heads..They usually just route the crankcase breathers back into the air filter on your carb ..look on the back of the carb plate and you will see a couple of hoses attached.....Some customs use individual breathers mounted somewhere around the carb....they look cool..and keep oil from getting sucked into the heads..but then you can just vent your crank case out the back of the cases with the vent there by the oil pump ...you should do this anyway, make your engine happy......Oh yes, make sure you don't have any fuel lines sitting on top of the engine or something, it wouldn't even have to be hot out to vapor lock.....by the way , am i looking at a metal fuel line in the picture? I would suspect that for vapor lock.....nice looking scooter man!
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Old 06-06-2017, 09:54 PM
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Thanks for all the input so far guys.

I didn't get a chance to check out the spark yet, but as for the air lock questions.....
I know my gas cap has a rubber ring around it that literally seals up against the opening.
So it can't be vented there. It's gotta be somewhere else, and I'll have to look for it.

The bike RUNS and I rode it's fat ass all summer just fine with 2 conk outs.
So it's obviously GOTTA be vented somewhere, but maybe it's not enough possibly or there's a clogging issue ....I dunno.

Still new to this
I'll get the spark checked against the head, and get the other questions answered so I can kick this pig into season.
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