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Offline Ranger25

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clunky first gear
« on: 08 June, 2019, 08:21:41 AM »
hello.....i have a 2013 cbf with 11000 kilos on the clock,,  when i select 1st gear from neutral the box clunks and bike jumps a little ...otherwise there is no dragging of clutch and box works fine in all gears...just going from neutral to 1st.....anyone else experience this...thankyou9

Offline Admin

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Re: clunky first gear
« Reply #1 on: 08 June, 2019, 09:43:12 AM »
This engine does clunk into first, Fireblades are the same.

Offline Art

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Re: clunky first gear
« Reply #2 on: 08 June, 2019, 04:57:38 PM »
Check the drive chain, if the drive chain becomes too slack you get a clunk as the chain whips when selecting gear.

Offline tonywing

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Re: clunky first gear
« Reply #3 on: 08 June, 2019, 05:55:09 PM »
Mines the same, it's just how they are. I find if I hold the clutch lever in for 5 seconds first then select 1st gear it don't clunk.
« Last Edit: 08 June, 2019, 05:58:43 PM by tonywing »
Growing old is inevitable, growing up is optional

Offline Ranger25

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Re: clunky first gear
« Reply #4 on: 09 June, 2019, 05:31:38 AM »
thanks ... after numerous adventure bikes, i am back on a road bike, the best thing i have done in a long time😁😁, so a clunky first gear is nothing compared to the absolute pleasure of riding a 'biffer'.

Offline pedro

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Re: clunky first gear
« Reply #5 on: 09 June, 2019, 07:22:26 PM »
Yeah, it is a case of "they all do that sir". Especially when initially selecting first after start-up. Unless it's very pronounced, nothing to worry about.

Offline iNCORRIGIBLE

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Re: clunky first gear
« Reply #6 on: 09 June, 2019, 07:52:09 PM »
*Originally Posted by tonywing [+]
Mines the same, it's just how they are. I find if I hold the clutch lever in for 5 seconds first then select 1st gear it don't clunk.

Hi,Tonywing.Have tried your "5 second" idea & it really does make a big difference!.Would love to know why it works if anyone knows please?Ed. :015:

Offline Art

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Re: clunky first gear
« Reply #7 on: 09 June, 2019, 08:36:10 PM »
The clunk is a combination of a harsh gear change and chain whip, it gets worse with too much slack in the chain because the chain has more movement and rebound.

Harsh gear changes are caused when the clutch plates do not completely disengage this is more noticeable on cold starts because the engine oil is cold and doesn't flow between the plates so well. Holding the clutch in for 5 seconds before selecting gear allows more time for the oil to flow between the clutch plates and completely disengage which results in a smoother clutch action, smoother gear change and less chain whip.

Offline tonywing

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Re: clunky first gear
« Reply #8 on: 09 June, 2019, 09:08:26 PM »
Glad it works for you Ed  :028:

I always does the 5 second rule especially first thing in the morning. I try to do this at traffic lights also, it's just a case of watching the other lights and timing it right. Hopefully my gearbox will last a bit longer  :001:
Growing old is inevitable, growing up is optional

Offline Tommo2

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Re: clunky first gear
« Reply #9 on: 10 June, 2019, 01:06:50 PM »
All Hondas I have owned or ridden do it/ did it. It seems to me the best Japanese bike gearboxes are Suzuki, then Kawasaki and/or Yamaha. Hondas are the worst for clunky gearboxes for some reason.

 


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