Cold header on #3 and #4? - Wrist Twisters
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post #1 of 4 Old 02-07-2017, 04:37 PM Thread Starter
Join Date: Feb 2017
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Question Cold header on #3 and #4?

Hi everyone, I am new to Hornet 919
I have recently change my FPR since my bike was having issue on gas smell and very rough riding on lower rpm (<3000rpm) and header #3 remain cold on cold start (other headers are doing fine).

After changing fpr and new spark plugs, the gas smell has gone and seems running better on lower rpm but still a bit jerky on 1st gear (<2000rpm) and a light surge while rpm past around 3500rpm, is it normal?

Also, I test my header on cold start, header #3 and #4 seems heating slower than #1 and #2,
#3 and #4 may have 3~5secs delay before getting any heat where #3 is heating the slowest,
I can still hold #3 while #1,2 and 4 are too hot to hold
but they all get very hot after a while by idling,
what problem could it be?

Sorry for my bad English since it is not my first language,

Thank you in advance.

(P.S After sending my bike to fix the FPR and valves cleaning etc, my HISS light is not blinking anymore after switch off the bike, anyway to bring it back on?)

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post #2 of 4 Old 02-24-2017, 10:29 AM
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Have you checked for fuel in the vacuum hose coming off of you FPR? How clean do you feel your injectors are?

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post #3 of 4 Old 02-24-2017, 10:45 AM
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Mine has had a surge at 3500 rpm since day one, tried everything to get rid of it, after 36k miles I've learned to live with it

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post #4 of 4 Old 02-25-2017, 09:24 AM
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Originally Posted by voodooridr View Post
Mine has had a surge at 3500 rpm since day one, tried everything to get rid of it, after 36k miles I've learned to live with it

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+1, until I had a custom tune done, it was amazing! Could walk the bike down to 800-900 rpms before it would start lurching. Smooth as butter. Plus that on/off throttle was largely mitigated. Just the way it should have come from the factory. That crude fuel injection system is an embarrassment.

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