trying to work out what this pipe is

dcoffman · L Plate Warrior Joined: 15 Jun 2017 Karma :

i have been looking at a 125cc motorcycle its a 2008 cruiser problem is i had a 2000 motoroma which had a metal pipe running from the engine just next to the exhaust connection this pipe tilted forward and ran up the front of the bike not sure where it went now this 2008 cruiser has the same metal pipe problem is this 1 is snapped off the pipe goes nowhere i need to know what that pipe was and where should it go????

i am sure i have seen the same sort of pipe system on newer bikes but instead of metal they are rubber running from roughly the same location.

will attach a picture of the pipe in question

kgm · World Chat Champion Joined: 04 Jun 2015 Karma :

What is the model name?

dcoffman · L Plate Warrior Joined: 15 Jun 2017 Karma :

i didnt take much notice so the model not sure kind of took a step back after i saw a snapped tube, didnt want to go any further without investigating i have googled 125s and came accross multiple for instance the lexmoto arrow has the same tubes but in this case its rubber like most newer bikes

https://www.lexmoto.co.uk/gallery/HT125-4F/600/17.jpg
https://www.lexmoto.co.uk/HT125-4F.php

dcoffman · L Plate Warrior Joined: 15 Jun 2017 Karma :

imagine a snorkle it has the pipe that comes from ur mouth ur side of ur face so in this case a metal pipe that runs from top of engine into the tank and connects to the air valves at top of fuel tank not to sure of this tho

dcoffman · L Plate Warrior Joined: 15 Jun 2017 Karma :

another picture of an 125 engine see the 3 dots above the sparky left and right are screw holes middle is where the pipe/tube runs from

https://legacy.chinesemotorcyclepartsonline.co.uk/images/largeimages/120600043-2.jpg

kgm · World Chat Champion Joined: 04 Jun 2015 Karma :

It should probably lead to the EGR valve - an emissions device that recirculates some of the exhaust gases back into the engine to reduce nitrogen oxide emissions. That's what you see at the end of the pipe on the Lexmoto photos you posted.

It's possible the previous owner has tried to remove the EGR valve in an attempt to improve performance but if that's the case it should really be blanked off rather than just having the pipe chopped. They're not expensive on most chinese bikes if it's missing but if it was a tuning attempt I'd be wondering what else had been done.

dcoffman · L Plate Warrior Joined: 15 Jun 2017 Karma :

thanks mate well that answered my question not worth the risk in my eyes because i am now wondering what else has been messed with think i will look elsewhere thanks pal Very Happy

P. · Red Rocket Joined: 14 Feb 2008 Karma :

NJD · World Chat Champion Joined: 11 Mar 2015 Karma :

Just for visual reference as to what would have been (or along the lines of):

https://s8.postimg.org/sxk7m5ghh/image.jpg
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MarJay · But it's British! Joined: 15 Sep 2003 Karma :

My GF has a Derbi Cross City 125 with the same engine... No idea where the pipe goes, but as said it's probably some emissions thing.
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Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.