CBR 1000F "Hurricane" 1987-1996 CBR 1000F

Pilot Screw Adjustment Procedure for Rough Idle

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Old Jul 2, 2013 | 05:45 AM
  #1  
Sean1000f's Avatar
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Default Pilot Screw Adjustment Procedure for Rough Idle

Hi again guys.

I am now confident I have a set of really clean carbs that are perfectly synched with a Morgan Carbtune.

I have installed a brand new set of pilot adjustment screws and set them to the default 3 turns out as described in section 5-14 of the service manual.

I still have the bike idling quite roughly similar to toecutter2503 post
https://cbrforum.com/forum/cbr-1000f...-108655/page2/

The bike sounds like his youtube video

I do not have a tacho to pick up the +- 50 RPM in the pilot screw adjustment procedure.

Any ideas on an alternative method of achieving the adjustment. The bike seems to be running quite rich. I have seen some posts about adjusting each pilot screw until the bike starts to labour but as it is running quite rough anyhow it is hard to tell.

Thanks
 
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Old Jul 2, 2013 | 06:05 AM
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By the way my bike is a 1997 (SC24) so I don't know if the default setting is still 3 turns out?
 
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Old Jul 2, 2013 | 07:20 AM
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Most guys advise 2.5 turns out.
 
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Old Jul 2, 2013 | 11:02 AM
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2 & 1/2 is the norm like Hawkwind just stated - even a hair less in cooler higher
elevations. Hope you put new orings in with each needle
 
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Old Jul 2, 2013 | 12:34 PM
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Originally Posted by Sprock
2 & 1/2 is the norm like Hawkwind just stated - even a hair less in cooler higher
elevations. Hope you put new orings in with each needle
Yes sure did. Honda UK sell the needle, o-ring, spring and washer as a single item. £15 of my hard earned because they refuse to sell the o-ring separately!!

I've tried 2.5 out and certainly the exhaust seems less 'fuely' and idling bit more stable. I'm going to post a video of what the bike sounds like to see what you guys think. Maybe I am being over critical of a 15yr old bike!!
 
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Old Jul 2, 2013 | 01:44 PM
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Idle should be 1,200 rpm. Sounds a little low.
From the video, it sounds like a slight rattle form sync being out slightly.

It should be smoother.
 
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