Twitches when starting! Help me, i'm so tired - Wrist Twisters
 
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post #1 of 18 Old 07-11-2014, 11:32 AM Thread Starter
Milites Gregarius
 
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Twitches after the beginning of the movement! Help me, i'm so tired

Hello ppl's, sorry for another thread, but I really need help.
I have no one to consult about my problem.
Noticed this about a month ago
I have a problem, when the engine is warm, there are jerks at the moment start move. Also, if I go to idle speed and fast open throttle motorcycle starts to twitch 5-6 seconds and then normally accelerates.
I thought it was FPR again, but there are no signs, all the pipes are heated identically, bike rides smoothly on low rpm (2-3k rpm), in a vacuum hose is no smell of fuel.
What was done:
I cleaned the injector, changed spark plugs, checked the ground on the frame, checked the fuel pump pressure, there is normal, did valve sync, measure the resistance spark plug wires (1 cyl 4.88, 2 cyl. 4.69, 3 cyl 4.96 4 cyl 5.16).
What else can I check? Does this sound like a clogged fuel filter?
Thanks.
Sorry for my low english.

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post #2 of 18 Old 07-11-2014, 12:39 PM
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TPS?

(Throttle position sensor)

I thought the bike stalled out completely when that started to go though, I dunno.

Do you have a power commander installed?

"A motorcycle is not just a two-wheeled car; the difference between driving a car and climbing onto a motorcycle is the difference between watching TV and actually living your life."
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post #3 of 18 Old 07-11-2014, 06:31 PM Thread Starter
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Quote:
Originally Posted by TheBeeDeeGee View Post
TPS?

(Throttle position sensor)

I thought the bike stalled out completely when that started to go though, I dunno.

Do you have a power commander installed?
No, i don't have

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post #4 of 18 Old 07-11-2014, 07:52 PM
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Don't know much about 9ers in particular but it does kinda sound like a fuel filter...

How does it run on the high end? Does it bog at all when you snap the throttle on?

:buell:
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post #5 of 18 Old 07-11-2014, 11:26 PM Thread Starter
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At middle-high speed, no problem. The problem is only when starting or fast open throttle at idle speed. But, if I ride 2-3k rpm and fast open throttle, no such problem.

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post #6 of 18 Old 07-12-2014, 12:45 AM
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Believe it or not, check your chain.

Might be too tight and/or has kinks in it.

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post #7 of 18 Old 07-12-2014, 03:14 AM Thread Starter
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Quote:
Originally Posted by Pvster View Post
Believe it or not, check your chain.

Might be too tight and/or has kinks in it.

No, I regularly maintenance it, clean and lube. I replace chain and sprockets 7000 km ago. I think my problem is related with fuel or air.
May be it's really TPS, check it tomorrow.
Also, I will try to replace wires spark plug with caps.

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post #8 of 18 Old 07-12-2014, 05:13 AM
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Quote:
Originally Posted by Pvster View Post
Believe it or not, check your chain.

Might be too tight and/or has kinks in it.
This is worth looking into.

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post #9 of 18 Old 07-12-2014, 06:32 AM
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Well I got nothing else for ya, maybe the chain thing like PV said....

My bike rattles, knocks, clinks, clacks, coughs, wheezes and sounds like a Chinese New Year on decel it took me a long time to get use to it and as long as it keeps rocketing forward as usual I just try to ignore the rest...

Do the 9's have temp sensors for the intake air? Is there any way to reset or adjust the TPS?....just wondering...

:buell:
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post #10 of 18 Old 07-12-2014, 06:39 AM
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Possibly could be a vacuum leak somewhere. Pretty sure that on low loads the ECU relies on the MAP sensor more that the TPS. If either sensor was bad you would most likely get the FI light codes, but could be a vacuum leak throwing things off.

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post #11 of 18 Old 07-12-2014, 11:55 AM
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Quote:
Originally Posted by hookups View Post
No, I regularly maintenance it, clean and lube. I replace chain and sprockets 7000 km ago. I think my problem is related with fuel or air.
May be it's really TPS, check it tomorrow.
Also, I will try to replace wires spark plug with caps.
Did you check to make sure the chain was not too tight? Its a very common mistake people make. Especially when people make the adjustment with the rear wheel off the ground.

You have to remember, this is a 919. KISS principle applies.

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post #12 of 18 Old 07-12-2014, 04:01 PM
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What is this chain thing you keep speaking of? You mean to tell me motorcycles have chains...

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post #13 of 18 Old 07-12-2014, 04:54 PM
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^^^ only the good ones.

Spoiler:

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post #14 of 18 Old 07-12-2014, 05:47 PM
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^^^ only the good ones.

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post #15 of 18 Old 07-13-2014, 10:10 AM Thread Starter
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Hello my friends, small update:
Problem seem was in spark plug wires. I cleaned my ignition coils and cut plug wires, about 5 mm, because they have been corrosion. Today I took bike for quick trip and all was fine.
Thanks all! Good luck on the road.
Best Regards,
Sergey.

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post #16 of 18 Old 07-13-2014, 10:22 AM
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Quote:
Originally Posted by hookups View Post
Hello my friends, small update:
Problem seem was in spark plug wires. I cleaned my ignition coils and cut plug wires, about 5 mm, because they have been corrosion. Today I took bike for quick trip and all was fine.
Thanks all! Good luck on the road.
Best Regards,
Sergey.
Awesome, glad you figured it out.

"A motorcycle is not just a two-wheeled car; the difference between driving a car and climbing onto a motorcycle is the difference between watching TV and actually living your life."
-2005 CBR 600 F4i
-2001 RC51 ** SOLD
-2002 VFR 800**SOLD
-2002 919 **SOLD
-2006 599 ** WRECKED
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post #17 of 18 Old 07-13-2014, 10:59 AM
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Quote:
Originally Posted by TheBeeDeeGee View Post
Awesome, glad you figured it out.
+1!

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post #18 of 18 Old 07-13-2014, 11:43 AM Thread Starter
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