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kevb



Joined: 08 Aug 2012
Posts: 13
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PostPosted: Mon Apr 22, 2013 6:57 pm    Post subject: Carburetta settings Reply with quote

Hi:

I have just purchased a db125-9 which is supposed to have an auto-choke but when I look at the carb. it has a choke lever. If I set it to fully up, figuring that this is off then set the intake screw 2.5 turns out. It seems to idle at 5000. Just turned the screw out another .5 turns and it idles ok but if I take it for a ride will idle at 5000 for about 5-10 secs before settling. Is it just bedding in? I have never experienced this. Plus when it's cold on a warm morning it's very difficult to start. Anyone got any ideas?

Kevin


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blito



Joined: 20 Apr 2011
Posts: 287
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Location: Lincoln, UK

PostPosted: Thu Apr 25, 2013 5:56 am    Post subject: Re: Carburetta settings Reply with quote

kevb wrote:
Hi:

I have just purchased a db125-9 which is supposed to have an auto-choke but when I look at the carb. it has a choke lever. If I set it to fully up, figuring that this is off then set the intake screw 2.5 turns out. It seems to idle at 5000. Just turned the screw out another .5 turns and it idles ok but if I take it for a ride will idle at 5000 for about 5-10 secs before settling. Is it just bedding in? I have never experienced this. Plus when it's cold on a warm morning it's very difficult to start. Anyone got any ideas?

Kevin


I would have thought fully up would be fully choked....
As you say, very strange as the 129-9 is advertised as having auto choke and all the carbs listed for this model on CMPO feature auto choke...
[/I]


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rob63



Joined: 16 Feb 2011
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PostPosted: Thu Apr 25, 2013 4:51 pm    Post subject: Reply with quote

Is this the db125-9 which is a motorbike, or the db125t-9 which is a scooter ?


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kevb



Joined: 08 Aug 2012
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PostPosted: Wed May 01, 2013 9:49 am    Post subject: Reply with quote

Hi:

Thanks for the reply it's the motorbike. I got in touch with db but they just said 5 000 rpm is normal. Icon_lol5.

Kevin


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chaz



Joined: 30 Jun 2012
Posts: 547
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Location: melksham wilts

PostPosted: Wed May 01, 2013 11:16 am    Post subject: Reply with quote

are you altering the mixture screw or the tickover one


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kevb



Joined: 08 Aug 2012
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PostPosted: Wed May 01, 2013 9:23 pm    Post subject: Reply with quote

Its the pilot air mixture screw on the side that I have to have approximately 5 turns out and the choke 1/2 on. Even when warm, if I turn the choke off it stalls out. The idle screw, well the only thing that I can see that can be adjusted on top of the carb is all the way down but have tried setting the pilot to 2 1/2 turns and then adjusting that but only changes by about 1000 rpm.


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kevb



Joined: 08 Aug 2012
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PostPosted: Fri May 03, 2013 10:59 am    Post subject: Reply with quote

I've played with this enough now!! All I can come up with is the float is set at the wrong level and that's what's causing all these issues. As it's a brand new bike taking it into the bike shop and let them fix it for me.

Thanks for your help to everyone that even tried to think about what the issue might be.

Kevin


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rob63



Joined: 16 Feb 2011
Posts: 111
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PostPosted: Fri May 03, 2013 6:00 pm    Post subject: Reply with quote

kevb wrote:
Hi:

Thanks for the reply it's the motorbike. I got in touch with db but they just said 5 000 rpm is normal. Icon_lol5.

Kevin

If I remember correctly the bike has a copy of the old Honda cg125 motor and carb. The choke lever is deceptive, it`s in the off position when you push the lever down, pulling it up brings the choke on. The idle screw should be on the opposite side of the carb to the choke lever about 1/3 or half way up the slide body.


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kevb



Joined: 08 Aug 2012
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PostPosted: Tue May 07, 2013 8:08 pm    Post subject: Reply with quote

Thanks, even in that position with the idle screw (the one on the opposite side with a spring on it, which is the only screw that can be adjusted other than the drain screw), 2.5 turns out like the manual says causes the high idle. When I reduce it and ride the bike on the highway going up hill it chokes and spits. I've got it booked in for a service on Thursday and hope that the service mechanic can fix it because I'm really getting irritated with this bike. The gear shift broke off today and I had to get it welded so more expense. I'm wondering if this bike is a second or something!!!

Kevin


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geoffh



Joined: 08 Aug 2011
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Location: Wigan,England

PostPosted: Fri Sep 26, 2014 8:09 pm    Post subject: Reply with quote

A quick cry for help with my 139QMB rebuild,can anyone define how much a "turn" is on the mixturescrew I,ve got the right screw etc, is a turn defined as the head moving 180 degrees or 90,probably very basic but your help is required Very Happy

cheers geoff


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chaz



Joined: 30 Jun 2012
Posts: 547
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Location: melksham wilts

PostPosted: Fri Sep 26, 2014 8:30 pm    Post subject: Reply with quote

Geoff, a turn is 360 degrees therefore as normal carbs are set around 1& 1/4 turns out .
screw the correct screw in until it just bottoms out. don't do tight as there is a spring and o ring at the bottom so don't damage them. from the bottom I usually turn 1/2 a turn at a time as easier to turn than a complete turn at a time. this is usually the base setting then 1/4 turn either way


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geoffh



Joined: 08 Aug 2011
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Location: Wigan,England

PostPosted: Fri Sep 26, 2014 8:41 pm    Post subject: Reply with quote

Thanks chaz my manuals quote 2.5 turns as a guide I,ll go with your advice,thanks.

geoff Very Happy


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chaz



Joined: 30 Jun 2012
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Location: melksham wilts

PostPosted: Sat Sep 27, 2014 8:56 pm    Post subject: Reply with quote

Geoff, get it running and go for a ride, remove the spark plug after a good run around full throttle and check colour, too sooty/black its too rich, too white and its too lean. oh, clean the plug first


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