popping exhaust

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

Hi all i have a 125cc keeway brought 2weeks ago still running in at 240miles but my exhaust has started to pop when i change up a gear, no problems when changing down gear, Would this be due to something i am doing wrong, I ride carefully trying to keep within the boundrys of running the bike in, is this damaging the bike, Mainly happens going from 1st - 2nd cheers for any help.

Ed Case · World Chat Champion Joined: 01 Mar 2009 Karma :

A 'popping' in the exhaust on the over-run is usually caused by an air-leak in the system.

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

Thank you that could be possible because I am having an issue with when i stop at lights when i am in first with the clutch in it is around 3000-3500 instead of 2000 was told on that post it could be an air leak around the carb area would these issues be connected. Thanks again.

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

Is this a major issue my bike is two weeks old is this a manufacturers issue or would this be down to me.

biker7 · Crazy Courier Joined: 15 Feb 2012 Karma :

Best take it to the dealer as it is under warranty.
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moonzoomer · World Chat Champion Joined: 01 Jul 2012 Karma :

Ed Case · World Chat Champion Joined: 01 Mar 2009 Karma :

As Biker7 says, back to the dealer as this could result in too 'lean' a fuel/air mixture and lead to over-heating, in an extreme case a burnt-out exhaust valve or even a holed piston.

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

Would it be something i have done or is this just a fault with the being its so new thank you for your replies.

biker7 · Crazy Courier Joined: 15 Feb 2012 Karma :

When you take it back the dealer will try to see if you are at fault. You just say you rode it like the book says. They have to prove otherwise - don't put any ideas in their head! Trust me on that one - been there, done that!
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Fat Bob (2019)

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

c_dug · Super Spammer Joined: 04 Sep 2007 Karma :

Just to clarify, it sounds like you have two separate issues, the revs sticking could be several things, as mentioned it could be an air leak before the cylinder, it could be a sticking throttle, or even just a badly adjusted tick-over speed.

As for the popping from the exhaust, again it could be caused by a number of things, it seems odd that it is between gears when accelerating.

[purely speculation from here] I wonder could they both be related as the most simple explanation for the high revs would be that you are riding around with the choke on? I guess this could also cause some popping from the exhaust if it is running rich enough?
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unitynotsocri... · Banned Joined: 29 Jun 2011 Karma :

new bike,running in,even the carb and running gear,not just the engine,silly cable routing or,as on new bikes,cables that settlt in and snag each other,like clutch and throttle,revs rising when on tight lock etc....just trimming in issues,get to dealer,its due some clean oil and filter examination soon so do it now.
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redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

should i take it in for its first service now then (260 miles) or get him to adjust it all then take it in for the service at 400 miles.

biker7 · Crazy Courier Joined: 15 Feb 2012 Karma :

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

Thank you for the support will take it to them tomorrow will let you know whats said he has been good so far (but no issues yet) will see what happens.

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

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

Are you still riding it with the revs like that?

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

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

Not normal, max should be 1500. running it like high is just stupid. What garage advised you of that?!

Seriously, they sound like a nice garage Rolling Eyes

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

Sorry i am new to this so not a clue they have said it is fine they will adjust everything on my first service he has looked at it twice, first time when i went back to get my mate some gloves he looked over it while it was running said that it was looking/sounding good then today about the carb issue and he had the bike running idle (2000 revs) and he said everything was fine. I will take a before photo tonight when i get back to it before my ride home and a photo when i get home just incase i am reading it wrong. Cheers.

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

There is more than likely an idle screw, wind it out a tiny bit. If you do not know what it is, don't touch anything. Get someone to wind the idle speed screw out a turn. It should drop the revs to a usable standard.

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

Ok is it ok to get home tonight or do i need someone to sort it now i can take it back to him tomorrow its only round the corner from me. Cheer.

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

redelmo · Borekit Bruiser Joined: 26 Feb 2013 Karma :

Will do thanks again will let you know the outcome.

biker7 · Crazy Courier Joined: 15 Feb 2012 Karma :

When he adjusts it have a look where the screw is - you'll do this yourself soon no problem. The way we learn about bikes is when something needs doing. The next time we say oh yes I know what to do there and so it goes on until you know more than me which is not much really Very Happy

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Fat Bob (2019)