Technical Mini max to jnr Rotax max

Dannylloyd13

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Age
34
Location
Runcorn
Name
DANIEL LLOYD
Young Driver Class
Junior Rotax
Hi all

fairly new to Karting so I’m after some advice please. We bought my son a mini max kart and although he’s 13 left the exhaust restrictor in just to build his confidence up. He’s now comfortable in the kart so I would like to remove the exhaust restrictor and fit the new junior one we already have. This is a pre Evo engine so it’s currently running a 142 main jet. With me now Fitting the new exhaust Flange could anyone point me in the right direction roughly on what I will need to do with the jetting etc. I know jetting is subject to a lot of different things etc but a ball park safe number would be great. For info it does not have any throttle restrictor in it.

thanks

Danny
 
Try 121 to 128 or settle around 124
 
Try 121 to 128 or settle around 124
It’s a pre Evo engine so I think the jetting is a lot higher then Evo due to different carb
 
It’s a pre Evo engine so I think the jetting is a lot higher then Evo due to different carb
Your right. I didn't read that bit. No idea then sorry
 
The jet labs app on apple and android will give you a good idea tbf! Always a good starting point.
 

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