If you are going with the OS 46 and you are going with a new 46AX (the .46FX I beleve is long gone in new production) I would recommend you make sure you are buying the .46AX series 11 not the older version with the rear needle valve. The Original 46AX was a design orphan and its carburation set up was vastly different from all the other AX's in the series.

The Fx was an excellent engine but the AX's are superb.

Having said that and if you are buying new (excellent) my engine recomendation For that airplane would be either the OS .55AX or even the .65AX agine both superb in many ways as well as probally the best user friendliness avalible.

I tested a Tiger two last year for a fellow that was a retractable and he had a Bar Stock Jett .90 installed great fun and an airplane I would have liked to own. Don,t say that to much anymore about other folks stuff


John