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Old 10-17-13, 12:02 PM   #1
Dan Shackell
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New to the site, but in dire need of a motorbike expert to help me.

Desperate for someone to help. I own a yamaha aerox 50cc. Pretty standard bike, it does 50-55 generally. However, its not running great recently, acceleration is very poor, and inconsistant. I have a stage 6 replica exhaust which i bought, but then discovered, the bike needs to be upjetted to match the exhaust or something? With this exhaust on the bike wouldnt go over 30 mph. So i put my old standard exhaust back on. I dont know alot about bikes, but i need to sell it in a month or two as im getting a ktm duke 125. Could anyone tell me, how i would be able to match the carb to the exhaust so that it ran great and performed alot better? Any advice welcome!!
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Old 10-17-13, 12:13 PM   #2
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Any advice welcome!!
I advise you to check out a motorcycle forum.
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Old 10-17-13, 12:15 PM   #3
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Old 10-17-13, 12:53 PM   #4
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Old 10-17-13, 12:59 PM   #5
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Desperate for someone to help. I own a yamaha aerox 50cc. Pretty standard bike, it does 50-55 generally. However, its not running great recently, acceleration is very poor, and inconsistant. I have a stage 6 replica exhaust which i bought, but then discovered, the bike needs to be upjetted to match the exhaust or something? With this exhaust on the bike wouldnt go over 30 mph. So i put my old standard exhaust back on. I dont know alot about bikes, but i need to sell it in a month or two as im getting a ktm duke 125. Could anyone tell me, how i would be able to match the carb to the exhaust so that it ran great and performed alot better? Any advice welcome!!

The decline in performance you noted is to be expected when one changes the exhaust but does not make any changes to the carb. You will need to rejet your carb for the increased airflow of your aftermarket exhaust. You will need to do some research on which size pilot jet is needed for the exhaust you have (assuming you are still using the stock airfilter). Usually the jet comes as part of a kit, you will have to research which one you need as I ride a 1300cc honda vtx with cobra longs and have dyna-jet kit in my carb. Once the correct jet is in place you will then need to screw the air-fuel mixture screw in and slowly back it out while the bike is idling until you get good performance at idle. The next step will be to roll on the throttle to see if you get any backfire or hesitation and trim the air-fuel mixture screw to work that out. A few throttle chops and spark plug checks after that to ensure you are not running too lean or too rich and the appropriate adjustments for either condition and you should be good to go. Oh yeah, you may need to change the needle in the carb too along with the jet...whatever kit you buy should have all the necessary stuff in it.

The questions I have for you are why are you changing out your exhaust if you are going to sell the bike? And did putting your old exhaust back on bring the performance back to what it was before you swapped it with the aftermarket exhaust?

Do some research on a motorcycle forum...this one is for bicycles.

Keep the shiny side up.
-j
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Old 10-17-13, 01:09 PM   #6
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People modding motorcycles for performance usually also add a lower-flowing filter on the other end with an aftermarket airbox filter or individual carb filters. Any info you glean regarding jetting for your particular exhaust mod, make sure that you check to see if there's an accompanying air filter mod you'll need to do to match the rest of the system.

Without re-jetting, with only the aftermarket exhaust, your bike was probably running too lean.
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Old 10-17-13, 01:51 PM   #7
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If you don't have flow testing equipment, you have to do it by ear and feel. Change a jet, ride it, chaenge it again. Repeat until desired results apply. Put it back to stock and sell it with the stag 6 pipe as a bonus.
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Old 10-17-13, 01:59 PM   #8
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Put it back to stock and sell it with the stag 6 pipe as a bonus.
This.
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Old 10-17-13, 02:11 PM   #9
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It's value is enhanced, in stock form..................
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