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We consider the Diophantine equation $7x^{2} + y^{2n} = 4z^{3}$. We determineall solutions to this equation for $n = 2, 3, 4$ and $5$. We formulate a Kraustype criterion for showing that the Diophantine equation $7x^{2} + y^{2p} =4z^{3}$ has no non-trivial proper integer solutions for specific primes $p >7$. We computationally verify the criterion for all primes $7 < p < 10^9$, $p\neq 13$. We use the symplectic method and quadratic reciprocity to show thatthe Diophantine equation $7x^{2} + y^{2p} = 4z^{3}$ has no non-trivial propersolutions for a positive proportion of primes $p$. In the paper \cite{ChDS} weconsider the Diophantine equation $x^{2} +7y^{2n} = 4z^{3}$, determining allfamilies of solutions for $n=2$ and $3$, as well as giving a (mostly)conjectural description of the solutions for $n=4$ and primes $n \geq 5$.

On a class of generalized Fermat equations of signature $(2,2n,3)$