Os 21j carb on hyper .21 8 port

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Old 05-11-2019, 03:12 PM
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Default Os 21j carb on hyper .21 8 port

Hi,
I've been experimenting with the OS 21j carb on my Hyper .21 8 port as the hyper carb struggled to keep a tune. I know the OS 20e carb has been used to get a reliable tune by others but as i couldnt find one cheap i thought I'd try the 21j. I tried the factory settings for the os carb but the engine wouldn't start. After some tuning I have it starting & idling but can't get it past half throttle without it bogging then stalling.

Anyone ever tried doing a similar swap or able to offer any advice?
Thanks in advance.
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