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Author Topic: exhaust stainless system  (Read 275 times)


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exhaust stainless system
« on: November 16, 2018, 09:37:28 AM »

I noticed my bottom part spliter exhaust is badly rusted and I think it will maybe only last a year or under and when it blows was thinking of buying stainless rather then a new stock oem downpipe system

I got carb version gt125r

does this after be upjetted if I was to buy this downpipe system to fit with stock exhaust


it says •Accepts the original silencer or any that fits the original system. No modifications required for bikes on original settings.

but not sure if that's true as the exhaust says more exhaust flow
« Last Edit: November 16, 2018, 09:40:30 AM by shane2k »

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Re: exhaust stainless system
« Reply #1 on: November 20, 2018, 12:18:34 AM »

Upjet anyway unless you care a lot about emissions.


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Re: exhaust stainless system
« Reply #2 on: December 31, 2018, 03:59:50 AM »

Generally you do not need to re-jet. You should be able to adjust the fuel/air mixture a little if needed.

The re-jet is to get more fuel flow if you are running very lean which I doubt will be the case. If you open up the airbox to increase the amount of air intake then you may have to re-jet. Of course increasing fuel use will lower your miles per gallon.


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Re: exhaust stainless system
« Reply #3 on: January 06, 2019, 12:18:55 AM »

Traditionally the GT125/R run lean as standard.

Exhaust and air filter or airbox mods require an up-jet, else throttle response is poor.

On what archaz said, yes and no. If the bike is lean, you will use more fuel and get less response than usual, so there is the chance that upjetting my actually improve fuel efficiency in the scenario where the bike has already been modified. Most definitely it will use more than a bike with a standard exhaust/air setup though.

If there was such a thing as a smiles per mile measure though, you'd be winning for sure.
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