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Honda CG 125 2004 - Air Suction Valve Delete and Air Filter

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rpsmith79
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Joined: 31 Jan 2017
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PostPosted: 07:37 - 02 Feb 2017    Post subject: Honda CG 125 2004 - Air Suction Valve Delete and Air Filter Reply with quote
Hi again, whilst in the process of stripping my bike down to get the engine out to do the head gasket, i came across the Air Suction Valve, now being predominantly a car guy, this is all a bit new to me, but seems like a similar concept to a car EGR valve

And whilst stripping the bike, i was trying to get rid of any unnecessary clutter, so my question is can i get rid of the Air Suction Valve, any issues in doing so, and if i can is there anything special i need to take into consideration

Also, while i'm at it, i would like to remove the air box and fit an open filter, partly for ease and simplicity, but also an open filter can be bought for pretty much the same price as a replacement drop in filter
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jaffa90
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PostPosted: 12:15 - 02 Feb 2017    Post subject: Reply with quote
My bike has a P.A.I.R. valve which will be disconnected some time because of a slight fault .
https://hondacg125.awardspace.com/basic_fault_finding.htm
Be carefull not to run on a weak mixture with freeflow air filter, air cooled engine as well.
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rpsmith79
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PostPosted: 14:48 - 02 Feb 2017    Post subject: Reply with quote
jaffa90 wrote:

Be carefull not to run on a weak mixture with freeflow air filter, air cooled engine as well.


Do you mind if i ask why (genuinely want to learn about bike etc) as having never owned an aircooled engine i'm not sure of its quirks just yet

Very new to Bikes, and not worked on a carbs since i passed my car test 20 odd years ago, and even then i didn't have much to do with them

I figured that the free flow filter will just replace the stock airbox and filter, would not replacing a blocked filter with a clean filter change the air flow anyway, like it would replacing an airbox with a free flow filter

I'm assuming i could just get the carb re-tuned after replacing the filter either way (new clean filter or free flow filter)

Probably advisable anyway as it is running a bit rough, what with it having a head gasket failure and all
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chris-red
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PostPosted: 14:55 - 02 Feb 2017    Post subject: Reply with quote
A big open filter will have far more of an affect on a small carbed engine, than on a car engine 10X the size. It's a simple bike it doesn't have the sensors cars have to adjust the fuelling.

Keeping the stock airbox and filter will have you a lot of hassle. Even if you do get the bike set up right you'll gain bugger all.
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rpsmith79
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PostPosted: 15:31 - 02 Feb 2017    Post subject: Reply with quote
chris-red wrote:
A big open filter will have far more of an affect on a small carbed engine, than on a car engine 10X the size. It's a simple bike it doesn't have the sensors cars have to adjust the fuelling.

Keeping the stock airbox and filter will have you a lot of hassle. Even if you do get the bike set up right you'll gain bugger all.


Fair enough, i was just trying to simplify things, as the stock airbox to carb clip is jammed solid, so i'm going to have to carefully cut it off without damaging the airbox

My thinking was just fitting an open filter from an earlier CG 125 (that didn't have the airbox design), so in effect replacing the 2004 airbox with a 2003 open filter, so not an uprated filter as such

Something like this

https://www.motorcycleproducts.co.uk/air-filter-honda-cg125-k1-1977-80-power-off-set-p-85564.html?gclid=Cj0KEQiAzsvEBRDEluzk96e4rqABEiQAezEOoJx7Tvicz1s2hAuc3_q3hhTnb7JTSqYOx0aRq_NLbSEaAjqd8P8HAQ
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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 15:33 - 02 Feb 2017    Post subject: Reply with quote
rpsmith79 wrote:
chris-red wrote:
A big open filter will have far more of an affect on a small carbed engine, than on a car engine 10X the size. It's a simple bike it doesn't have the sensors cars have to adjust the fuelling.

Keeping the stock airbox and filter will have you a lot of hassle. Even if you do get the bike set up right you'll gain bugger all.


Fair enough, i was just trying to simplify things, as the stock airbox to carb clip is jammed solid, so i'm going to have to carefully cut it off without damaging the airbox

My thinking was just fitting an open filter from an earlier CG 125 (that didn't have the airbox design), so in effect replacing the 2004 airbox with a 2003 open filter, so not an uprated filter as such

Something like this

https://www.motorcycleproducts.co.uk/air-filter-honda-cg125-k1-1977-80-power-off-set-p-85564.html?gclid=Cj0KEQiAzsvEBRDEluzk96e4rqABEiQAezEOoJx7Tvicz1s2hAuc3_q3hhTnb7JTSqYOx0aRq_NLbSEaAjqd8P8HAQ


That's not a standard filter, All Cg's had airboxes AFAIK.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.
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TUG
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Joined: 12 May 2007
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PostPosted: 15:35 - 02 Feb 2017    Post subject: Reply with quote
Unless you're doing a cafe racer build like my for shits and giggles, I wouldn't fit an open filter for a CG, you won't gain anything but headaches and frustration.
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rpsmith79
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PostPosted: 15:43 - 02 Feb 2017    Post subject: Reply with quote
Cheers guys, thanks for that

Learning all the time Wink
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jaffa90
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Joined: 06 Apr 2016
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PostPosted: 16:20 - 02 Feb 2017    Post subject: Reply with quote
rpsmith79 wrote:
jaffa90 wrote:

Be carefull not to run on a weak mixture with freeflow air filter, air cooled engine as well.


Do you mind if i ask why (genuinely want to learn about bike etc) as having never owned an aircooled engine i'm not sure of its quirks just yet

Very new to Bikes, and not worked on a carbs since i passed my car test 20 odd years ago, and even then i didn't have much to do with them

I figured that the free flow filter will just replace the stock airbox and filter, would not replacing a blocked filter with a clean filter change the air flow anyway, like it would replacing an airbox with a free flow filter

I'm assuming i could just get the carb re-tuned after replacing the filter either way (new clean filter or free flow filter)

Probably advisable anyway as it is running a bit rough, what with it having a head gasket failure and all


A weak mixture can overheat the engine and cause damage, that`s why modern bikes are water cooled to handle weak mixtures for E.U. regulations emissions crap.
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neptune8
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Joined: 22 Nov 2016
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PostPosted: 17:47 - 02 Feb 2017    Post subject: Reply with quote
https://hondacg125.awardspace.com/ follow this link to a site that gives allsorts of info about your bike, including anwers to queatins about air/fuel mixture and air suction valve.
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TheInternet
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Joined: 14 Dec 2010
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PostPosted: 20:15 - 02 Feb 2017    Post subject: Reply with quote
neptune8 wrote:
https://hondacg125.awardspace.com/ follow this link to a site that gives allsorts of info about your bike, including anwers to queatins about air/fuel mixture and air suction valve and a whole load of mental nonsense.

EFA
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rpsmith79
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PostPosted: 21:41 - 02 Feb 2017    Post subject: Reply with quote
Nice one, cheers guys
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