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Cox Engine of The Month
January-2022
Mark Boesen's

Twin Needle Thermal Hopper with a Cage Mount.



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Thermal Hopper twin needle Empty

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Thermal Hopper twin needle Empty Thermal Hopper twin needle

Post  Cescoturbo Thu Feb 13, 2020 4:44 am

Hi all, i'm Francesco, from Italy, i'm collecting cox engines after found a medallion 0.9 in a box sleeping by 25yrs
i just bought this beauty thermal hopper, good conditions, good compression, probably polished by seller or prev owner, i try to start it, but it does few fires and not runs...i opened it to clean and i didn't found any gasket between cranckcase and rear plate and reed valve not close good.
- someone knows as disassembly reed valve? it is locked
- someone can do a picture of it in good condition?i would check if mine is damaged or flexed or other
- someone has a wrench / prop/ rear bid cage or other parts unuseful to sell?
thanks in advance for all your helps and sorry for my poor english


Thermal Hopper twin needle Img_2012
Thermal Hopper twin needle Img_2011
Thermal Hopper twin needle Img_2010
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Post  getback Thu Feb 13, 2020 6:02 am

Hello Francesco! Welcome to the Forum !! The reeds you speak of are no longer available , bee very careful not to fold these .. but the gaskets are https://coxengines.ca/cox-.049-thermal-hopper-space-bug-jr.-crankcase-gasket-2.html  You have a bad air leak with out them and is most likly your problem .. From the instructions sheets to the left <<<< https://dbabd7f0-a-62cb3a1a-s-sites.googlegroups.com/site/nitroengine/Thermal%20Hopper.pdf?attachauth=ANoY7cr9l4U-vptMXMD4HNZXZ0vulbgYtF4VXL0VC3HVqfOcL8rwTsmW_7bcv4kVgkMl3nSFsPOlUVia8-vHvgd66ZkFdUzGR6n1UAORib8hcVwqD6hf3fqqv6Qc57EEPB4blK03UQXMfl_wcQjjoaBh_MnITWLgqGsDlYRoz_LGaw3K-XtfnmbGg2-zMchfpncHlGEDR8TqQW3HcENDFf-yfe01SZogIw%3D%3D&attredirects=0  There is more info here i will see if i can find it in a few min.s
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Post  getback Thu Feb 13, 2020 6:48 am

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Post  Cescoturbo Thu Feb 13, 2020 6:55 am


wow thanks, i tought in was a monolitic part with reedle retained by a locked plate..
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Post  Cescoturbo Thu Feb 13, 2020 7:07 am

Thermal Hopper twin needle Img_2013
It was so easy... Dirty... I'll order gasket and finger crossed, I want hear his voice
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Post  getback Thu Feb 13, 2020 7:44 am

Wow that is pretty dirty looking , but not stuck ! The thin reed goes in First then second reed , Top retainer (note slot ) MAKE SURE THE RETAINER FITS SNUG if not when running it will come off and destroy it Very Happy Beer Cheers
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Post  Cescoturbo Thu Feb 13, 2020 7:55 am

@getback wrote:Wow that is pretty dirty looking , but not stuck ! The thin reed goes in First then second reed , Top retainer (note slot ) MAKE SURE THE RETAINER FITS SNUG  if not when running it will come off and destroy it  Very Happy Beer Cheers
yep, i have a doubt about shape retainer, i hope nobody mod it before, blowing inside inlet with my mouth not easy to flow, reversing it close.

another quick info...how set twin needle?? and why twin lool, better spray? inside they are the same
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Post  getback Thu Feb 13, 2020 8:14 am

The Bird Cage are found now and then for sale but U have to bee patience https://www.ebay.com/itm/NEW-IN-BOX-COX-049-THERMAL-HOPPER-MOUNT-MODEL-AIRPLANE-ENGINE-THIMBLE-DROME/383417419829?hash=item5945758835:g:VFwAAOSwUrxeQ15m Usaually 20-25 US dollar New
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Post  Cescoturbo Thu Feb 13, 2020 8:26 am

@getback wrote:The Bird Cage are found now and then for sale but U have to bee patience https://www.ebay.com/itm/NEW-IN-BOX-COX-049-THERMAL-HOPPER-MOUNT-MODEL-AIRPLANE-ENGINE-THIMBLE-DROME/383417419829?hash=item5945758835:g:VFwAAOSwUrxeQ15m  Usaually 20-25 US dollar New

are you the ebay seller you link?... wow td 0,010 in bid from 96dollars.... here +200dollar for new one... Mad Mad
i'm following also space hopper <3
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Post  Cescoturbo Tue Feb 25, 2020 9:39 am

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