HPI engine ID

[BenJammin]

Anyone able to identify this engine fitted to a newly aquired Hyper7 for me please? It has HPI castings on the block, but no displacement or markings on the heatsink.

Looks similar to the F4.6 in my Savage but not identical. K4.6 maybe?

I'm looking for a pullstart for it. I have a 14mm rotostart backplate spare but this engine has a 12mm OWB. Typical really

TIA

 

[BenJammin]

Also, while I'm here; anybody know what the score is with that reciever box? Nothing similar comes up when looking for a replacement, the HoBao ones seem to look totally different