Author Topic: Surging engine  (Read 4310 times)

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Offline think.bike

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Surging engine
on: 02 July, 2010, 08:20:29 AM
Just become the proud owner of a CBF1000 (06), having traded in my 04 CFB600 which I have had from new. (cracking all round bike)

Happy with the 1000 so far, it pulls like a train! just what I wanted for two up touring.

Only snag is, it's surging! no problem whilst accelerating/decelerating but it does not like constant speed, I've built up the revs (in nuteral) to 3k rpm hold the throttle dead still and the revs fluctuate up and down by as much as 500rpm.

It's going back to the dealer (70 miles away and a day off work) who said he will sort it

Any advice would be most welcome, so far I've just put some injector cleaner through the system, no change!

Any clues?

#1

Offline daesimps

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Re: Surging engine
Reply #1 on: 02 July, 2010, 09:36:33 AM
I have an 07 Biffer with 13,000 miles on the clock and have a similar problem that it's done since new - dealers have always reported "no fault found".

It's very hard to maintain 30 mph in built up areas.  It seems to "chug", like your rapidly turning the throttle on and off (like when you watch a learner driver kangaroo).

If it ain't broken - fix it 'til it is!

#2

Offline Bifferman

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Re: Surging engine
Reply #2 on: 02 July, 2010, 10:27:19 AM
The surging definitely needs the dealer to look at it but first check how much slack there is in the throttle twistgrip, too much can cause this symptom.  If you bought from a dealer then it is worth having them get to the bottom of without helping them in the first instance as if it should turn out to be something to do with  a faulty engine management sensor and there are a few you will want the dealer to pick up the tab.

Worth doing a search as this has cropped up before though not that often.

Andy

 :149:

#3

Offline RhondaK

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Re: Surging engine
Reply #3 on: 02 July, 2010, 09:30:38 PM
*Originally Posted by Bifferman [+]
The surging definitely needs the dealer to look at it but first check how much slack there is in the throttle twistgrip, too much can cause this symptom.  If you bought from a dealer then it is worth having them get to the bottom of without helping them in the first instance as if it should turn out to be something to do with  a faulty engine management sensor and there are a few you will want the dealer to pick up the tab.

Worth doing a search as this has cropped up before though not that often.

Andy

 :149:

 :0461: There were several posts in the early days of the forum (and yours is an early bike) about poor running on light throttle openings and the general advice was to check slack in throttle cables and/or get the dealer to check/adjust the throttle potentiometer.

If you want to see these posts, put "slack" and "potentiometer" in the search box near top of page.

RK

#4

Offline think.bike

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Re: Surging engine
Reply #4 on: 02 July, 2010, 11:44:16 PM
Thanks for the advice guys, it's booked in to a performance specialist next week on my suppliers say so, so should get sorted.

I'll give the throttle a check before that as there seems to be a flat spot, it could be me just getting to know the bike, I've had six years of trouble free biking with my previous CBF 600 so may have been spoilt.

Thanks Again

#5

Offline Bifferman

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Re: Surging engine
Reply #5 on: 03 July, 2010, 11:17:05 AM
Not spoilt at all, as good as the CBF600 its larger brother is in a higher league altogether - and runs smoothly without surging.

Andy

 :149:

#6

Offline Piper

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Re: Surging engine
Reply #6 on: 03 July, 2010, 12:04:54 PM
In my and many other folks experience the CBF1000 engine can run a tad erratic around 2750rpm.  It has been reported when the bikes are fairly new and normally smooths out with mileage. Every now and again if I get stuck at those revs I can feel it very slightly so just change gear to avoid.  I hardly ever notice it these days at almost 9000miles and when it was a problem adjusting the slack out of the throttle helped.
Also another trick that used to be talked about a lot here at one time was disconnecting the flapper valve.
https://www.cbf1000.com/index.php/topic,2151.0


 Not tried it myself but some say it helps.

Pete

Last Edit: 03 July, 2010, 12:06:44 PM by Piper

#7

Offline think.bike

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Re: Surging engine
Reply #7 on: 04 July, 2010, 08:47:36 AM
Thanks for the advice guys

We all want to know a new bike is ''right'' and I'm sure this one is.

I went out for a play last night and the bike deffo seemed better, the surging was still there although not as noticable, I have put some injector cleaner through the system, (max concentration) and treated the bike to some ''posh'' pertol

 I notice the flat spot on a cold engine (can live with that)

Also binned the Givi touring screen (which was giving me a headache) for the std Honda one on low setting, much better for me, although I'm waiting to see
feedback on how the laminar flow brackets work

http://www.laminar-flow-windscreen-adjuster.webs.com/

Now all I need to do is try and keep my licence, Biffers are FUN!

#8

Offline Bifferman

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Re: Surging engine
Reply #8 on: 04 July, 2010, 10:17:05 AM
*Originally Posted by Piper [+]
In my and many other folks experience the CBF1000 engine can run a tad erratic around 2750rpm

Also another trick that used to be talked about a lot here at one time was disconnecting the flapper valve.
https://www.cbf1000.com/index.php/topic,2151.0

 Not tried it myself but some say it helps.

Pete

Probably explains why I have not noticed - I don't ride at c.2,750rpm :110:

Finding Badapples post from way back was a gem though, shows the search button works.

Andy

 :149:
Last Edit: 04 July, 2010, 11:03:14 AM by Bifferman

#9

Offline RogerG

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Re: Surging engine
Reply #9 on: 04 July, 2010, 10:42:17 AM
I have just done the ‘Flapper Valve’ mod and it has made a big difference to my Biffer.

The three problems it seems to have cured are…

1> Clunky gear changes in traffic because I couldn’t drop the revs just a little when changing up a gear – it was either same revs or tickover revs, and nothing in between. (tried removing slack in the Throttle cable but it didn’t help)

2> When decelerating in gear, there was always a ‘sudden’ engine drag, and you could hear the chain objecting.

3> When at Motorway speeds and on slight downhill runs, the engine would never just go along - it seemed like it was always trying to decide whether to slightly accelerate or not.

All these problems are gone now. I did notice that they all got worse when the hot weather came, so when the Summer ends (probably next week  :001: ) it may be different.

To make sure I had not upset the high (rather high’ish) revs, I left a small roundabout under a Motorway and proceeded up the steep uphill ‘on-ramp’ – at around 5,000 revs in third gave the Throttle a good twist (never done that before, still getting used to the Bike)  and the beast accelerated beyond my wildest dreams (or worse nightmare) – I said two words to myself and the second one was ‘Ada’.

I still find that the Throttle is over sensitive at the bottom end and if anyone knows a way of spreading out the Throttle control so full Throttle takes around a 120 degree turn please let me know.

Every mistake begins with a choice

 


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