CBF1000

CBF1000 => General Maintenance, Servicing, and Mechanical => Topic started by: Ranger25 on 08 June, 2019, 08:21:41 AM

Title: clunky first gear
Post by: Ranger25 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
Title: Re: clunky first gear
Post by: Admin on 08 June, 2019, 09:43:12 AM
This engine does clunk into first, Fireblades are the same.
Title: Re: clunky first gear
Post by: Art 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.
Title: Re: clunky first gear
Post by: tonywing 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.
Title: Re: clunky first gear
Post by: Ranger25 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'.
Title: Re: clunky first gear
Post by: pedro 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.
Title: Re: clunky first gear
Post by: iNCORRIGIBLE 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:
Title: Re: clunky first gear
Post by: Art 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.
Title: Re: clunky first gear
Post by: tonywing 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:
Title: Re: clunky first gear
Post by: Tommo2 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.
Title: Re: clunky first gear
Post by: Ranger25 on 11 June, 2019, 08:14:12 AM
i have tried the 5 second rule,,, certainly helps, also cleaned and adjusted chain😁😁   interestingly my  transalp 700 does not do it at all..
Title: Re: clunky first gear
Post by: Tommo2 on 11 June, 2019, 11:26:36 AM
Ranger,
Bit off topic, I am interested why you prefer the road bike to the adventure bikes you had?
Tommo2
Title: Re: clunky first gear
Post by: Ranger25 on 12 June, 2019, 05:11:38 AM
i rode superbikes many years ago....couple of years ago started riding again, single cylinder, twins, v-twins.....the 4 cylinder is so much smoother, handles better and accelerates in any gear to over 200, ......nothing wrong with adventure bikes, i will get one soon as a weekend play bike, but this honda is such a pleasure to ride
Title: Re: clunky first gear
Post by: jm2 on 16 June, 2019, 10:35:32 AM
.. accelerates in any gear to over 200, ...
:005:

Oh, k's ....
Title: Re: clunky first gear
Post by: Victorthou on 19 June, 2019, 09:41:46 PM
As a recent owner of a Biffer i've noticed the clunky 1st gear. I'm interested to try the 5 second rule. I'll give that a go.
Title: Re: clunky first gear
Post by: Kamboskid on 06 August, 2019, 09:38:00 PM
Hi, dunno what others think of this, I generally leave the bike in gear before I put it to bed, start it up in gear and pull away, the next day, no clunking into gear, I actually pulled away in 5th gear with a cold engine!
Title: Re: clunky first gear
Post by: raYzerman on 07 August, 2019, 01:43:54 PM
What is happening is most likely a little clutch drag, moreso before the engine oil warms up.  Three possible causes for the "kerchunk" some bikes have.... brass bushing in the clutch lever is worn (replace it, use silicone grease on it), clutch system not optimal in that an annual flush and bleed will keep it optimal, and clutch plates insufficiently lubed with oil.  To fix the latter, do a clutch soak... remove and clean as necessary the clutch plates, soak in oil for a few minutes, reinstall.  You most likely will only have to do this once.  5 second rule helps also, but may not be necessary after all the above is addressed.
Title: Re: clunky first gear
Post by: silentblock on 08 August, 2019, 11:24:38 PM
This is normal years ago when we rode old bikes with kick starts it was the practice to kick the engine with the clutch leaver pulled in to free the clutch plates before starting the engine then it did not crunch when gears were selected. modern bikes with push button starters this is not possible shows 5 second rule is much the same idea.