Backfire during hot start?
Road Master
Joined: Jul 2016
Posts: 870
Likes: 245
From: Transfer, PA
Many, if not all, vehicles now prime the pump before even turning the ignition on. Had an 01 VW that ran the pump when you opened the drivers door, we have an 11 Explorer that does it as soon as the key touches the cylinder.
Road Warrior
Joined: Sep 2006
Posts: 1,681
Likes: 233
From:
Well this is good to know. my bike i have no idea how old the battery is since i bought it used and it also has issues starting when hot. It doesnt backfire though, if you hit the start button say if i stop for gas ill hear a "Clunk" followed by nothing, then a cough from the engine and no start. Try it again and it starts up (but never as smooth as when its cold) the battery has problems holding a charge so thats a good idea ill try changing the battery. I just figured its the way harleys are sometimes.
I occasionally get the same thing with my 08 Road King. Many people have this happen and the easy work around is to NOT wait for the fuel pump to stop before hitting the starter, turn the switch, hit the starter. About 95% of the time I get a clean start dong that, every now and then, it acts the same way as waiting for the pump to stop. I pulled my air cleaner to look inside the intake after the pump ran and I see just a bit of fuel vapor. I suspect a slightly "weepy" fuel injector, but not bad enough to replace for the time being. This is for the hot start only since the cold starts are normal.
Cruiser
Joined: Aug 2012
Posts: 155
Likes: 5
From: So Cal
I had this same issue on my 2008 SG for a while. Once I got a new battery never had this issue again... I thought to myself that it can't be the battery as I always have it on the tender. Wasn't until I replaced the battery I realized it was low on the cranks.
Seasoned HDF Member
Joined: Apr 2010
Posts: 33,712
Likes: 3,720
From: Connecticut.
My fat bob purchase (from the dealer) I was told to wait til you stop hearing the pump then fire it up, was told the same thing from the seller of my current bike. Clearly the moco has some kind of injector fired motor testing that had them come to this conclusion.......but as for the hot start, I fire it right up .
5th Gear
Joined: Aug 2012
Posts: 9
Likes: 0
From: Langley BC
I have a 2009 Electra Glide with a similar problem, It kicks back when starting after a short stop for fuel or at the border crossing. My starter one-way clutch eventually got stripped.
Replaced starter one-way clutch with AllBalls clutch, tey claim it's 20% more torque capacity.
I had replaced original compensator with a SE compensator probably in 2012-2013 (cant remember for sure when) when i did a primary oil change and find metal shavings.
Few years back IN 2014 replaced the battery and that cured the problem for about 2-3 years. I keep the battery on the trickle charger during the winter, but noticed last year the kick-back problem came back.
I found that there are 1.6kW hi-torque starter available, just wondering if anyone have tried them?
There's a fix available from HD dealers where they will add compression release, but this is about 2500$, found a guy that does it for 300$ without taking the heads off. But still wondering
1. can i get a higher crancking amps battery
2. will a hi-torque starter cure the problem
Replaced starter one-way clutch with AllBalls clutch, tey claim it's 20% more torque capacity.
I had replaced original compensator with a SE compensator probably in 2012-2013 (cant remember for sure when) when i did a primary oil change and find metal shavings.
Few years back IN 2014 replaced the battery and that cured the problem for about 2-3 years. I keep the battery on the trickle charger during the winter, but noticed last year the kick-back problem came back.
I found that there are 1.6kW hi-torque starter available, just wondering if anyone have tried them?
There's a fix available from HD dealers where they will add compression release, but this is about 2500$, found a guy that does it for 300$ without taking the heads off. But still wondering
1. can i get a higher crancking amps battery
2. will a hi-torque starter cure the problem
Last edited by andy-hd; Apr 19, 2018 at 05:40 PM.
Supporter
Joined: Jan 2007
Posts: 15,787
Likes: 5,612
From: along the shore of Mishigami
I'm from the old days I use the ignition switch to shut down the bike, the dealers tell you to use the run/stop switch to shut down the engine, but have they told you to shut off the ignition to save your battery, if you don't, your headlight/s stay on. If you ever kill an AGM battery it's service life is severely degraded. a new battery may be in the works for you. Clean the connections real good when you install the new battery.
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5th Gear
Joined: Aug 2012
Posts: 9
Likes: 0
From: Langley BC
Called the place where i bought the battery last time, they gave me the part number, its YIX30L-BS.
This battery has 230 CCA.
I found i can get different batteries with 380, 400 or 500 CCA.
I think ill get a higher CCA battery and will see how that works.
This battery has 230 CCA.
I found i can get different batteries with 380, 400 or 500 CCA.
I think ill get a higher CCA battery and will see how that works.