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Author Topic: Keihn stock settings  (Read 13585 times)
sutty86
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« on: January 05, 2017, 23:58:58 »

Finally got pulley situation sorted, that's thread locked on there like a good one

Recently pulled carb out to have a nosey and clean presumed it would be gunky due to it standing so long ,
Was pleasantly surprised it was very clean.
Managed to put back together now bike will not start easy , after holding starter for 5 seconds it will rough idle and any touch (1mm) will cut out engine.
I've checked all wires,pipes etc for leaks , checked air box

Only think I can think of is the screw on the side of the carburettor not sure exactly what it does .
Idle screw is separate and is acting funny turning in both directions cuts engine and after restarting it's hesitant to start also when cutting out when touching the throttle it's also again hesitant to start.

After pulling carb out to check all pipes etc are good there is white smoke coming out of the engine inlet (normal?)
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The Bern
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« Reply #1 on: January 06, 2017, 09:38:46 »

You could try looking in the manual I linked in one of your previous threads (here or on MM) which will doubtless contain this information.
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Virago 535
Innova 125
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Mike H
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« Reply #2 on: January 06, 2017, 11:15:33 »

"screw on the side" might be throttle stop screw. This is what the throttle slide rests on when 'closed', but actually of course there needs to be a small gap, which may now be wrong.


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sutty86
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« Reply #3 on: January 06, 2017, 11:50:31 »

Believe it's air fuel mixture
« Last Edit: January 06, 2017, 12:12:26 by sutty86 » Logged
The Bern
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« Reply #4 on: January 06, 2017, 13:38:18 »

If you don't want to look at the manual, Google ..... keihin carb tuning .... & read the page by ... Shiney-Red
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Virago 535
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sutty86
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« Reply #5 on: January 06, 2017, 23:48:03 »

Cheers gents
Think I've realised my error going to come out with it, I think i may have put the needle in the wrong way as in spring first than needle so it wasn't sitting allway through carb,

I reckon that might be the problem, be playing about with the bike after work today (finished at five) bike is stuck there and managed to get it started but rough idle and bogging out.
Brought carb home tonight to have a look and I reckon that was my error
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Mike H
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« Reply #6 on: January 07, 2017, 11:30:41 »

That wouldn't help! Hope that's what it was. 
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The Bern
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« Reply #7 on: January 07, 2017, 11:53:06 »

Fingers crossed for an easy fix bud, I've not seen it so don't know how good it is, but there is a Haynes manual that covers several Piaggio 125's & your model is on the list .... http://www.ebay.co.uk/itm/Piaggio-Vespa-50-125-200-Scooter-1991-09-Haynes-Manual-FREE-P-P-READ-DESCRIPTION/191921538140?_trksid=p2141725.c100338.m3726&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20150313114020%26meid%3D5154afb37bbc4465a769ec5d03b72f23%26pid%3D100338%26rk%3D1%26rkt%3D8%26sd%3D400962739660
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Virago 535
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sutty86
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« Reply #8 on: January 07, 2017, 21:44:24 »

Starts perfect now , idles sweetly but again new problem.
Think it's the carb manifold which leads to the engine.
It's not sitting flush on the inlet valve I can see, slight gap which when sprayed with WD40 gives it power.
Basically when I blip the throttle now the bike doesn't power down, keeps same revs or even higher.
Ordered the Haynes cheers
https://youtu.be/OeJHf1Xdo4M
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Mike H
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« Reply #9 on: January 08, 2017, 12:38:01 »

Yes inlet leak could do that, is it the carburettor joint or inlet stub to cylinder head?

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Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.
Dave Milnes
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« Reply #10 on: January 08, 2017, 20:20:58 »

Sometimes the manifolds get a crack in them. They perish with age being made out of a sort of hard rubber, especially if you flex them while undoing the carb bolts. I guess all 125 motors will use the same part so they should be easily obtainable, but I'd avoid buying used ones as the crack is not always visible.
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2004 X9 500 Evo in YELLOW - 2016 Maxsym 600i Sport
Anderton 2004, Pen-y-cae 2005, Matlock 2006, Hay on Wye 2007, Minehead 2008, St Florence 2010, Newent 2011, North Kyme 2012, Betsw-y-coed 2013, Hardraw 2014, Parkend 2015, Whitby 2016, Mundesley 2017, Derby 2018, Telford 2019, Loch Doon 2020, Cumbria 2021.
sutty86
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« Reply #11 on: January 08, 2017, 22:04:20 »

Okay another little update with this carb,
Made sure they were no leaks fitted everything tight,
X8 still revved.
I removed the autochoke and voila bike runs great,
Autochoke still works , was warm and extends,
The hole where the choke goes if you put your finger over it , it runs high again, sucking air in)

Now I don't have a clue what's going on there.
So now the bike is at home did 20miles of dual carriageway,hills etc ran like a dream, with no choke.
Any ideas gents
https://youtu.be/BHSkC49wz4I

Also been offered a carb I believe walboro off an x9 125
Will it fit ( I know some x8s use this carb)
£20 for it , might sort out all these issues, if it's plug and play
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Dave Milnes
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« Reply #12 on: January 09, 2017, 12:00:19 »

The choke also uncovers, or blocks off an air bore that bypasses the butterfly to add a touch of fast idle when the choke is on. If the choke unit isn't correctly inserted, square and in fully and the right orientation the air duct may not be covered properly. Check to see if there are any alignment markings and also that the o-ring is sealing properly.
The carbs used on the various 125 motors are basically the same but later ones had some small changes in design and jetting to comply with emissions regs presumably.
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2004 X9 500 Evo in YELLOW - 2016 Maxsym 600i Sport
Anderton 2004, Pen-y-cae 2005, Matlock 2006, Hay on Wye 2007, Minehead 2008, St Florence 2010, Newent 2011, North Kyme 2012, Betsw-y-coed 2013, Hardraw 2014, Parkend 2015, Whitby 2016, Mundesley 2017, Derby 2018, Telford 2019, Loch Doon 2020, Cumbria 2021.
sutty86
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« Reply #13 on: January 09, 2017, 14:54:44 »

Figured it out, idle was set too tight, put choke back on and loosen idle.
Get in
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Mike H
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« Reply #14 on: January 09, 2017, 17:15:31 »

Easy once you know. 
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Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.
Dave Milnes
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« Reply #15 on: January 10, 2017, 08:49:34 »

True, you will possibly be the forum foremost expert on 125 carbs and transmission, certainly one with the most recent knowledge.
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2004 X9 500 Evo in YELLOW - 2016 Maxsym 600i Sport
Anderton 2004, Pen-y-cae 2005, Matlock 2006, Hay on Wye 2007, Minehead 2008, St Florence 2010, Newent 2011, North Kyme 2012, Betsw-y-coed 2013, Hardraw 2014, Parkend 2015, Whitby 2016, Mundesley 2017, Derby 2018, Telford 2019, Loch Doon 2020, Cumbria 2021.
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