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Walbro WT 903 replacement

Old 03-23-2024, 01:53 PM
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Default Walbro WT 903 replacement

What would be a good carb replacement for a Walbro Wt 903. Carb is stock on a CRRC 55 twin.
Thanks
Old 03-23-2024, 02:17 PM
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Does the original carb use internal pressure pulse or is there an external pressure line?

You should find a number of carb choices at Valley View RC, Mile High RC, etc. Any modern carb for that size engine should work as long as it has the proper pressure configuration.

Last edited by Truckracer; 03-23-2024 at 02:20 PM.
Old 03-23-2024, 04:29 PM
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external pressure
34 / 64 ( 0.531 ) venturi
ball bearing detent choke

these are the same features as my DLE 55 and DA 50
Can't find my walbro list right now, I will look again
Old 03-24-2024, 06:05 AM
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extra info:
I have a ( at best ) 53cc CRRC twin, it is made using 2 of there 26cc pro jugs and pistons so how they got to 55 I would like to know
unless the carb has been damaged, clean and replace the regulator diaphragm will fix wt type carbs 98% of the time ( how to vibs ).
Walbro WT carbs have the venturi size cast in 64th on the venturi itself, in this case 34.
Still can't find my reference chart for walbro.

Last edited by kmeyers; 03-24-2024 at 06:24 AM.
Old 03-24-2024, 06:15 AM
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pic from somewhere
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CRRC 55cc twin.pdf (47.6 KB, 28 views)

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