Not too sure if I should have posted on this forum, but it is racing I just have extra two wheels

I Still having loads of grief with the MC18 I have fitted in a superkart chassis, starts fine and tick's over well,ok right up though the rev range until it gets to 8500- 9000 then the lower/front barrel just dies, been through everything from carburation to electrics to new pistons and barrels.
I am not running a airbox just filter pods on the end of carbs. I have been told me that I need to run the airbox to get the max out of this motor. can any one confirm that this might be causing the problem I have. do I need the airbox fitted?.
kick myself if this is the case as I spent hours on this motor .
Owen

Thought someone might have been able to confirm if it is nessary to run the motor with the airbox or not?.

Airbox is not needed, I run uni pod filters on my track bike with no issues

Hi mate and thanks for the info. what is the max it will rev up to?.
Any thoughts as to what is causing my problem with my motor as I am at a loss.

Photos? What state are the reeds in?

m8nyloc wrote:Hi mate and thanks for the info. what is the max it will rev up to?.
Any thoughts as to what is causing my problem with my motor as I am at a loss.

My bike revs to I think about 11.5-12K. Sorry, but I am by no means a mechanic and unfortunately cannot help you with properly diagnosing your issue.
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1993 NSR MC21 SE 1990 NSR MC21 SP

Have you tried a new / another ignition unit on it?

Have you checked the pick ups?

Have you checked for arcing on the coil supply cables (black pitting)?

Have you checked the power jet?

What colour is the plug?