CBF125 Idle Speed Screw Location

Snop Doog · Brolly Dolly Joined: 29 Jul 2014 Karma :

~2009 Honda CBF 125

I have yet to buy a manual for this bike because I'm poor.

Anyway, nothings wrong with the bike, well there might be but it doesn't really bother me. But now that I've mentioned it I may as well explain it.

Ever since I've had the CBF its lights (dash, headlight, tail lights) dim and brighten up very quickly in the same fashion that the engine idles. Everything's fine when the bike idles after it has a cold start up as the RPMs are relatively higher but once it settles the lights do their thing. I've got two other friends with CBFs, ones a 2008 model and the other's a 2015 model. They both do the exact same thing. This leads me to believe that they all do it and it's got something to do with the fact that this bikes lights are powered by the alternator?

The main purpose of this thread was to see if there are any CBF owners who know the location of the idle screw as the only YouTube comment I found about it didn't really help me.

A picture of it would be greatly appreciated.

TL:DR: Anybody got a picture of the CBF's idle screw? - Google, YouTube and my brain haven't helped me.

ForestRunner · Nova Slayer Joined: 13 May 2014 Karma :

There isn't one.
Fuel injected. The lambda sensor is on the front of the engine near the horn.
IIRC this can cause problems with idle and feeling in general.
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Snop Doog · Brolly Dolly Joined: 29 Jul 2014 Karma :

finniee · Spanner Monkey Joined: 03 Jul 2013 Karma :

I thought something was dodgy with my cbf lights when I first got it.

I took it down to the wall when it was dark and let it idle, then I applied a little bit of throttle and the lights got brighter.
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Honda CBF125

Taught2BCauti... · World Chat Champion Joined: 12 Jan 2012 Karma :

You probably can't adjust the idle-air mixture, but there should be a throttle stop screw somewhere on the throttle body to adjust the idle speed.

Remove the right-hand cover and have a look at the throttle body, and you should be able to see a small hex-headed screw with a lock-nut that adjusts the position where the throttle valve (butterfly valve) comes to rest.

There are other things that can affect the idle speed on those though - so remove and check your spark plug to see if it running lean or rich, and check your air filter.

Valve clearances are also known to cause idle speed problems.

You might get better help from a specific forum or blog - try This One.
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The Shaggy D.A. · Super Spammer Joined: 12 Sep 2008 Karma :

Have a gander at this guy's blog - he's done a fair bit on his CBF125 :-

https://www.bikesandtravels.com/biker.aspx?ride=488
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Snop Doog · Brolly Dolly Joined: 29 Jul 2014 Karma :

Thanks for the replies!

I mean, there's nothing wrong with the way the bike idles, I just wanted to have a play around to see if I could get the lights to stop being so difficult.

It seems finniee's got the same problem (if it is a problem?) that I have.

Seeing as my bike doesn't have a tachometer, I can't tell if it's running to slowly or too quickly in the first place. I mean, I could make a sound recording of the engine if that helps.

finniee · Spanner Monkey Joined: 03 Jul 2013 Karma :

Snop Doog · Brolly Dolly Joined: 29 Jul 2014 Karma :

finniee · Spanner Monkey Joined: 03 Jul 2013 Karma :

You could go up in 10s for every gear like you do in a car to be honest.
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Honda CBF125

Snop Doog · Brolly Dolly Joined: 29 Jul 2014 Karma :

finniee · Spanner Monkey Joined: 03 Jul 2013 Karma :

Snop Doog · Brolly Dolly Joined: 29 Jul 2014 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Can I be the first to say. "If it aint broke, don't fix it.".

Doesn't sound like anything is broke to me so put the screwdriver down and step away from the vehicle.
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Snop Doog · Brolly Dolly Joined: 29 Jul 2014 Karma :