Author Topic: Warm starting issue  (Read 4532 times)

An Orange Crush

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Warm starting issue
« on: August 08, 2014, 10:00:09 PM »
My 2012 DT300i starts fine when its cold, but when I park it at work or anywheres that it will be sitting out in the sun it for a few hours it takes quite a feat to get it started.
I`ve tried the key off/throttle wide open/engine start on/ key on wait 8 seconds throttle off key off and after 4-5 tries I can finally get it started only after playing the throttle like a fiddle.
I`ve put in a new air filter but dont we have a fuel filter on these things we can change out too?
2011 DT300i
2009 SYM HD200 (sold)
2009 Kawasaki Brute Force 750i
2023 Kymco AK550
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agilebda

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Re: Warm starting issue
« Reply #1 on: August 09, 2014, 12:25:40 AM »
Sounds strange. Might be a fuel issue. I would start by replacing the spark plug. Check for air leaks in the fuel hoses.

This happened to me with my GTI recently. found out to be a weak battery. Swapped the battery and all was cool.

Does the fuel pump sound weak when you turn on the key?? Might be the fuel line isn't staying primed: zero pressure when bike is sitting.
« Last Edit: August 09, 2014, 12:29:06 AM by agilebda »

boo

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sounds like
« Reply #2 on: August 09, 2014, 09:44:25 PM »
vapor lock.
Do you tend to overfill your tank?.
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An Orange Crush

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Re: Warm starting issue
« Reply #3 on: August 10, 2014, 12:52:30 AM »
Thanks I`ll check those things out, and I`ll keep an eye on my fuel level when I fill up.
Its just really strange that it only happens when its been sitting in the hot sun, but never does it cold nor after its been warmed up from riding.
2011 DT300i
2009 SYM HD200 (sold)
2009 Kawasaki Brute Force 750i
2023 Kymco AK550
A couple really nice shiny helmets

"I`m a man, but I can change. If I have to.
.....I guess....."

kneeslider

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Re: Warm starting issue
« Reply #4 on: August 21, 2014, 01:00:11 AM »
Mine does that too but if it stalls after firing her up. It will take a few subsequent cranks to get her to fire back up. 
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CROSSBOLT

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Re: Warm starting issue
« Reply #5 on: August 21, 2014, 04:42:19 PM »
Orange, the fuel filter is on the intake of the fuel pump and ya gotta remove the pump to get to it. My DT300i gets a little grumpy on start when it is hot outside and has been stopped for a short time. That is when I have to play the throttle like a fiddle but this is once in a while. I would recommend reset/initialize to see if it makes a difference.

Karl
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kneeslider

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Re: Warm starting issue
« Reply #6 on: August 22, 2014, 12:44:19 AM »
The DT is an EFi bike. Fiddling with the throttle upon cranking shouldn't have any effect but it does.
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BettinANDlosing

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Re: Warm starting issue
« Reply #7 on: August 22, 2014, 04:43:33 AM »
Make sure you let the fuel pump prime for 5-10 seconds when you first turn your key on.
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

An Orange Crush

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Re: Warm starting issue
« Reply #8 on: August 27, 2014, 09:50:55 AM »
Ok so for these past few weeks I`ve been careful with my fuel levels and still have the starting issue. It does always start after doing a couple resets and playing the throttle.
My main concern was whether this was a sign of things to come and that something was about to break down on the bike and that sometime sooner or later my luck would run out.
My next plan is to pull the plug and have a look. I changed it last summer and have put a few thousand miles on it but maybe these Kymcos are plug eaters.
In the meantime, I`ve found that the computer reset is about useless really, I can do it 4-5 times exactly as described in the service manual and it will eventually start but starts hard, the better thing to do at least in my case is to hold the start switch and let it roll over a number of times then play the throttle a little bit and it fires right up.
I`m also going to order a new battery as agilebda mentioned.
One thing I`ve noticed right from the beginning is that this Kymco tends to roll over a few times before starting even on its best day. My SYM HD200, which has a carbureted engine would start within a half a second of hitting the start switch. I think maybe these stock batteries are a bit weak and sitting in the heat drains them just enough to make starting harder.
2011 DT300i
2009 SYM HD200 (sold)
2009 Kawasaki Brute Force 750i
2023 Kymco AK550
A couple really nice shiny helmets

"I`m a man, but I can change. If I have to.
.....I guess....."

BettinANDlosing

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Re: Warm starting issue
« Reply #9 on: August 27, 2014, 03:02:11 PM »
Did you tri pulling out that hazard control unit?
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

An Orange Crush

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Re: Warm starting issue
« Reply #10 on: August 27, 2014, 09:43:06 PM »
No I havent pulled the hazard control unit, where is it at and whats it for? Cant find it in the service manual.....
Pulled the spark plug and it looks alright but I`m replacing it anyways.
2011 DT300i
2009 SYM HD200 (sold)
2009 Kawasaki Brute Force 750i
2023 Kymco AK550
A couple really nice shiny helmets

"I`m a man, but I can change. If I have to.
.....I guess....."

BettinANDlosing

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Re: Warm starting issue
« Reply #11 on: August 27, 2014, 11:59:32 PM »
No I havent pulled the hazard control unit, where is it at and whats it for? Cant find it in the service manual.....
Pulled the spark plug and it looks alright but I`m replacing it anyways.
Under seat bucket, RH side of the bike by the RH seat latch, redish brown box with 11 wires and two connectors coming out of it.
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

An Orange Crush

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Re: Warm starting issue
« Reply #12 on: August 28, 2014, 01:46:35 AM »
Ok, should I pull it out and discontinue its use, or replace it with a new one?
2011 DT300i
2009 SYM HD200 (sold)
2009 Kawasaki Brute Force 750i
2023 Kymco AK550
A couple really nice shiny helmets

"I`m a man, but I can change. If I have to.
.....I guess....."

BettinANDlosing

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Re: Warm starting issue
« Reply #13 on: August 28, 2014, 02:13:02 AM »
Just pull it out and see if it solves your warm starting issue
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

CROSSBOLT

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Re: Warm starting issue
« Reply #14 on: August 28, 2014, 08:57:11 PM »
That hazard control unit really puzzled me. I checked the DT300i wiring diagram yesterday and there it was! The DT has 4-way flasher lights which are the turn signal lights all flashing at the same time. The "hazard control unit" is in between the turn signals and the "hazard switch" on the right handle bar. Now, what it would have to do with warm starting problems, I have not a clue. But, if it solves the warm start issue, so what? We will figure out that later.

Karl
Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

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