Occasional misfire - Yamaha Star Stryker Motorcycle Forum
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Old 06-18-2017, 06:48 PM   #1 (permalink)
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Default Occasional misfire

Hi,

I have a brand new 2014 Stryker, about 350 miles total, bone stock, no mods yet. At a stop light (warm engine, very warm day) I went to blip the throttle to take off and it misfired and stalled. It didn't stall because of dumping the clutch, it stalled because of the misfire e.g. (detonation or pre-ignition way before TDC).


I had an old 82 Virago 920 that would do that too, and thought it was specific to the Virago (like the meat-grinder starter it had). I was pretty surprised the Stryker did this too. It does this about once every other ride, so it is rare, but usually when quite warm.

Before I write this off as typical of V-Twins, and / or possible crappy gas I thought I would float these questions to the group.

1. Do they all do this under all conditions with any grade of gas? (e.g. yep it's a v-twin...its not a bug its a feature)

2. Does this only happen when the grade of gas is too low and the ECU stock firmware cannot compensate for it?

3. Something other than gas like spark plug gap or ???


Input and ideas appreciated.

Mike
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Old 06-18-2017, 11:20 PM   #2 (permalink)
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Happened one time on my Stryker .... But that was it. Happens often on my buddies vstar but that's carbureted. My guess is it gets caught up somewhere with timing and a fuel dump while there is no load on the bike. The bike calls for 87 grade and that's all I ever put in it. Anything else is a waste of money imo.

Also...i know it sounds cool but there really isn't a reason to blip the throttle so if it becomes an issue personally I'd just stop doing it. I keep telling my friend that and he continues to stall at traffic lights. ��
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Old 06-18-2017, 11:52 PM   #3 (permalink)
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For what I heard or read (I can't remember) Blipping the throttle on fuel injected bike is actually not good for the bike and here is what they say about it.

When you blip the throttle the ECU reads your RPM and throttle position and activate the injector and ignition timing accordingly. Since the engine has no load into it the ECU is fooled into thinking that your load is too light so adjust the timing to best serve your engine. Then on the second time you twist the accelerator you let go of the clutch and the full actual load is sent to the engine. The ECU, in turn, is trying to play catch up with the sudden change of load and sometimes failed which resulted in a stall and/or misfire.

Now I don't know if this is true or not but my personal experience is that misfire do happen when the engine is hot and I blip the throttle on a stop. So just take Gerdawg advice and not do it and blip only when downshifting. Since our bike is too fast for any man-made brakes to contain
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Old 06-19-2017, 07:17 AM   #4 (permalink)
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Thanks! Good explanations, makes sense. Old habits die hard. Blipping the throttle is more about fear of stalling it than anything really functional. I will try to roll it on smooth.
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Old 06-19-2017, 01:38 PM   #5 (permalink)
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I thought their was only two throttle positions. Closed and Wide open.
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Old 06-19-2017, 01:52 PM   #6 (permalink)
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Quote:
Originally Posted by bigredah View Post
I thought their was only two throttle positions. Closed and Wide open.
Ha! Good one. Usually true but I am trying to follow the break-in rules. Gotta wait till 600 miles on it before replacing the throttle control with a switch
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Old 06-19-2017, 03:14 PM   #7 (permalink)
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Yeah all that blipping is a Hardley thing. Guy did that next to me at an intersection the other day on his Hardley and I let a few bellows with my Chevy R10 w/383 and glasspacks back at him and scarred the ship outta him LOL.
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Old 06-19-2017, 04:27 PM   #8 (permalink)
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Quote:
Originally Posted by 11Stryker View Post
Yeah all that blipping is a Hardley thing.

It's because they are afraid if the bike dies it won't start again

I actually rented an ultra glide the other day in SC...that was a really comfy bike. Too bad it's like 30K
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