very high revs on cold start - Honda Motorcycles - FireBlades.org
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post #1 of 39 Old 04-13-2010, 2:18 AM Thread Starter
 
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very high revs on cold start

hello folks....my 929 blade has started to rev up to 4500rpm on startup. It has always started and stayed at 2500rpm or so for a few mins then slowly reached temperature and ticked over at 1200rpm. It hasnt done this in the past even during the ice and snow we have had the last few months. 4500rpm sounds so loud at 5.30 am (when I set out to work). I have checked the obvious cables and checked for air leaks but all seems fine. It doesnt do it every time but maybe 7 out of 10 starts it revs very high....any ideas????

dave h
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post #2 of 39 Old 04-13-2010, 4:09 PM
 
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Re: very high revs on cold start

sound like the choke?
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post #3 of 39 Old 04-13-2010, 4:54 PM Thread Starter
 
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Re: very high revs on cold start

yeah. its fuel injection so the choke is automatic. I wonder if it could be failing somehow...I will have to check at the weekend (unless someone has any info meanwhile)
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post #4 of 39 Old 04-13-2010, 11:46 PM
 
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Re: very high revs on cold start

if you revv it while its warming up..that will happen..i think when its revved the starter valves move to far in and increase the cold start speed...i know if i do it to mine it does the same thing
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post #5 of 39 Old 04-14-2010, 12:07 AM
 
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Re: very high revs on cold start

Quote:
Originally Posted by ZeroKool929 View Post
if you revv it while its warming up..that will happen..i think when its revved the starter valves move to far in and increase the cold start speed...i know if i do it to mine it does the same thing
ohh ohh
sounds like you guys have the same issue

A FIed bike can be revved while warming up, and it will return to its ~2500 rpm accelerated warm up.
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post #6 of 39 Old 04-14-2010, 12:18 AM
 
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Re: very high revs on cold start

it is pissed that it has to be up at 5:30am to go to work....I don't blame it for getting loud with you!!

maybe the stepper motor/auto choke is acting up???
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post #7 of 39 Old 04-14-2010, 1:54 AM Thread Starter
 
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Re: very high revs on cold start

lol....yeah getting started at 5.30 isnt very sociable. Thanks for the answers everyone....Zerokool...mine starts ok, ticks over at the normal 2500rpm warm up speed for maybe 20-30 seconds then shoots up to 4500-5000rpm without me touching the throttle at all...then settles again about 30 seconds later????
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post #8 of 39 Old 04-14-2010, 5:07 AM
 
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Re: very high revs on cold start

Something must be wrong with the fast idle control. There is a wax pellet that expands and contracts to control air bypassing the throttle plates that must be allowing too much air. Time to check a manual and I think it can be adjusted somewhat. It may need replacing. Strange because usually they don't allow the engine to come to proper hot idle when they are bad. They hang open.
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post #9 of 39 Old 04-15-2010, 10:19 PM
 
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Re: very high revs on cold start

Ya mine idle will only hang if i crack the throttle..it seems to be different that what your describing.. I know there is a warning in the manuel that states not to open the butterflys fully then shut them with out the cables attached..not 100% sure why..but maybe it hits the fast idle was unit and causes it to be out of wack..also you can remove the actual starter valves and clean them..theres a procedre to do so..and you def not want to use carb cleaner b/c of the inner coating..they recommend compressed air for the bores..maybe they are sticking.. but its wierd how your idle jumps back up without actually giving throttle..your sure you didnt damage the coating with in the tbis? around the butterflys? its black and looks just like carbon build up..it goes slightly above and below the butterflys..
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post #10 of 39 Old 04-16-2010, 3:07 PM Thread Starter
 
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Re: very high revs on cold start

I will check the throttle/butterflies tommorrow (saturday)..It hasnt done it the last couple of times that I,ve started it which is typical when you are ready to strip it down and sort it LOL....thanks for the replies ZeroKool
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post #11 of 39 Old 04-16-2010, 11:11 PM
 
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Re: very high revs on cold start

no prob! let us know what you find
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post #12 of 39 Old 01-02-2019, 12:57 PM
 
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Re: very high revs on cold start

hi did you ever get this sorted on your bike mines does the same never used to start from cold starts as normal after 20 seconds or so goes up to 45000-5000 then after 30 seconds ish drops back to normal
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post #13 of 39 Old 01-02-2019, 1:30 PM
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Re: very high revs on cold start

Nearly 9 years ago that post Gav, what is your problem in detail
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post #14 of 39 Old 01-02-2019, 2:54 PM
 
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Re: very high revs on cold start

yes mate did see that it was old i have a 929 first of fi ones road it all summer no problems now when you start from cold it starts as normal goes to about 2500rpm as should cos of choke after 20 seconds or so it pops upto 5000rpm stays there for 30 seconds or so then drops back down to 2500 after couple mins goes to normal idel when starting to warm. i donot touch throttle ust key in turn on hit button and leave
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post #15 of 39 Old 01-02-2019, 3:01 PM
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Re: very high revs on cold start

Is it spitting out any codes? can you check out the 4 sensors for proper working, MAP , ECT, TPS and IAT as these work with the ECU for a good start up, and have you changed the coolant lately?

Last edited by MrPickwick; 01-03-2019 at 9:14 AM.
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