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Honda CB1300 Juddering

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WILDECELT
Scooby Slapper



Joined: 12 Jun 2004
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PostPosted: 20:09 - 25 Oct 2016    Post subject: Honda CB1300 Juddering Reply with quote
Hi All Smile

Hope someone can help, recently purchased an 06 CB1300. The previous owner did not look after it well so the first thing was to give it a mini service, Air and oil filter, oil and spark plug change and replacement.
The Bike has an after market exhaust (Evo) and has has the flapper valve mod done.
Since the service it runs like a pig, its fine for around 15 mins then it judders and pops all over the place with the rev needle dipping below 1.
I've whipped the plugs off and they do look like its running lean, so i done a bit of research and bought and fitted a booster plug and K&N filter. The booster plug allows it to run a bit richer and attaches onto the AIT sensor (its a cheaper alternative to the power commander). Did that help ? NO...Still Juddering and popping like hell. Any ideas Sad
Thanks
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ADSrox0r
World Chat Champion



Joined: 23 Oct 2012
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PostPosted: 20:18 - 25 Oct 2016    Post subject: Reply with quote
Booster plug is just masking the problem. Sure you haven't just disturbed or damaged a vacuum line?
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Current bikes: '08 VFR 800 VTEC(yo) , '07 ZZR1400 Winter hack: '95 Aprilia 650 Pegaso Currently lusting after: RC30
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WILDECELT
Scooby Slapper



Joined: 12 Jun 2004
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PostPosted: 20:30 - 25 Oct 2016    Post subject: Reply with quote
Hi ADSrox0r

Are you referring to the fuel vacuum line?
I'm Not that savy on bike mechanics i'm afraid.

Cheers Thumbs Up
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ScaredyCat
World Chat Champion



Joined: 19 May 2012
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PostPosted: 20:33 - 25 Oct 2016    Post subject: Reply with quote
Also join the cb1300 forum lots of knowledgeable people there...
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Honda CBF125 ➝ NC700X
Honda CBF125 ↳ Speed Triple
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WILDECELT
Scooby Slapper



Joined: 12 Jun 2004
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PostPosted: 20:45 - 25 Oct 2016    Post subject: Reply with quote
Thumbs Up Smile Will do
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ADSrox0r
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Joined: 23 Oct 2012
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PostPosted: 20:54 - 25 Oct 2016    Post subject: Reply with quote
No not the fuel line. There are four vacuum pipes between the cylinders, check the connections and pipes for cracks. Vacuum leak would make it run like a pig.

Might be something simple as that, could be more complicated FI bumfuckery like a wibbly o2 sensor or an exhaust leak. Does it pop and burble on the overrun?
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Current bikes: '08 VFR 800 VTEC(yo) , '07 ZZR1400 Winter hack: '95 Aprilia 650 Pegaso Currently lusting after: RC30
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WILDECELT
Scooby Slapper



Joined: 12 Jun 2004
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PostPosted: 21:05 - 25 Oct 2016    Post subject: Reply with quote
Hi ADSrox0r

Yes it does..but more so when its coming down the revs..
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ADSrox0r
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Joined: 23 Oct 2012
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PostPosted: 21:26 - 25 Oct 2016    Post subject: Reply with quote
WILDECELT wrote:
coming down the revs..


aka 'overrun'.

Check for exhaust leaks, blown header pipe gaskets. Check you haven't kinked the fuel line when you put the tank back down. Fuel filter could also be clogged.

If the FI system is at fault the boosterplug could just be exacerbating the issue sending the ECU all over the shop. IIRC the plug just 'fools' the ECU into thinking incoming air is 20 degrees lower, thus richening up the mix (jump in and correct me anyone) so with a dicked o2 sensor who knows which way it'd jump.
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Old Thread Alert!

The last post was made 9 years, 118 days ago. Instead of replying here, would creating a new thread be more useful?
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