I am trying to decide which engine to mount on my GP Dazzler. Do they come out nose heavy or tail heavy? I am thinking about an OS .46 AX.

I have one with a OS48FS in it ...it needed a 1/2oz of lead in the tail to balance out on zero.... the 46ax is lighter then the four stroker......so you may not need to add weight.......JW

I flew mine with both a GMS .47 (weight is similar to OS .46 AX ) and later a Tiger Shark .52 without adding any weight to balance it and it flew great. It is very maneuverable so use expo on your transmitter to make it fly nice. I hated the landing gear on our grass field - it bends way too easily causing a propstrike - and I beefed it up but suggest that you use different gear such as aluminum. I also modified the tailwheel to protect the rudder servo. Its a fun plane. The TS .52 is a hot motor for it.

I will try to get a pic uploaded.

Tailwheel.

Tiger Shark .52 engine

have you tried the GP durel landing gear ? they have them at tower....JW...P.S nice mod's

The GP gear could work. The modified gear on my plane works well too.

Yup nice job..JW

If you have not spent your engine dollars yet, you should also look at the new series ASP .52 engines. This is now my engine of choice for a hot 40 size plane. It's essentially an OS clone with more displacement and quite a bit more power. We have several of them running around here, they are very nice. Have a look at this site for more info: www.justengines.unseen.org/ASP52S.htm. The engine works best on 5% nitro fuel (cheap fuel). The pic shows this engine installed in my GP Ultra Sport. With a 10x8 prop the plane is fast and has unlimited vertical. I suspect the OS engine will be easier to get tuned when new, but if you follow the guidelines below you should not have any trouble. Using the search function on these RCU forums will also give you an idea of what others think of these new engines. The info below here is from my review in the RCU product guide post (overview section) on this engine :
"The new ASP Super Series "S" .52 two stroke engine is an awesome little powerhouse. This new line of engines from ASP must not be confused with earlier ASP products which were sometimes temperamental or hard to tune. These new engines resemble the OS FX engines in appearance, size and weight but costs a lot less. I now have experience with three of these ASP .52 engines and highly recommend them to any RC flyer who wants more power for his .40 sized model. The engine starts easily and is easy to tune. Once it is run in and the high and low end needle valves are correctly set, you can expect it to idle slowly and reliably, have a silky smooth transition and develop exceptional top end power. This .52 has a MAJOR power advantage over all my .46 engines and this power increase makes a distinct difference in flight performance when you use it to replace a .46 engine. The increase in vertical performance is significant. The engine seems to like 5% (at the most 10 %) nitro fuel. The ASP .52 has the same mounting dimensions (including muffler mount) as the OS .46 FX and is about the same size - it is fractionally taller. It can be directly swapped and can use the same aftermarket pitts mufflers etc. I like these engines so much that I am replacing all my .46 engines with them. In North America the engines are available from www.goldscallop.com for approx US$80.00 and in Europe from "Just Engines" in the UK. Goldscallop also provides parts if you need them. Be sure to check out the RCM&E engine review and comparison test results on the "Just Engines" website - this ASP .52 outperforms even the mighty Irvine .53 ! Here are some tips on this engine: The supplied muffler gasket is no good - it will blow out in one of the first flights resulting in a loose muffler. The engine works fine without a gasket or you can use any gasket that fits the OS .46 / GMS .47 / Thunder Tiger .46 engines. I make my own by using the thin aluminum from disposable pie baking pans. Take the new muffler apart and seal the different sections with "Loctite Sleeve Retainer" when you reassemble it before running the engine. Super strong and leak proof - helps to keep your airplane clean. After adjusting the high end needle valve, close the throttle completely and carefully turn the low end needle all the way in. Now back it out approx half a turn. From here use the fuel line pinch technique to fine tune it. The manual recommend 2.5 turns - this did not work for me. The three engines I have dealt with all worked best with the low end needle backed out less than .75 of a turn. Then the transition is very smooth. After adjusting the low end needle be sure to recheck your high end needle. The engine can be supplied with a normal or a "super quiet" muffler. After testing both I found no major difference in the sound level or performance. If you want more oomph for your 40 sized plane and wish to fly rings around the better known and more expensive opposition, then give one of these new engines from ASP a try."

Thanks for all the comments. I will definitely replace the stock landing gear. Looks flimsy.