Thanks for your imput
It your getting a little smoke from the pipe you should be fine but you might richen a little if it slows down on top end then put it back where you had it. If you can find someone with a temp gauge you can borrow check to see if its hitting up around 300 degrees thats to hot.

IS this your engine
NOTES FROM OUR TECH DEPARTMENT
This is the DTX .18 Engine with Rotary Carburetor and Recoil.
It has the same mounting and muffler dimensions as the OS Max .12CV
2 Year Warranty

FEATURES: ABC construction, Aluminum piston with Chrome plated Brass
cylinder liner.
Rotary carb
Recoil starter
Ball bearing-supported crankshaft
Heavy duty con rod
Side exhaust
Duratrax Silver Sport glow plug, available separately (DTXG3001)
Natural aluminum (powder coat) 7-fin cylinder head

INCLUDES: One assembled DTX .18 engine with rotary carb and recoil starter
One set of instructions with parts list

REQUIRES: Muffler (exhaust system) depending on vehicle
Air filter
Fuel filter
Starting equipment
Fuel: 5% - 20% nitromethane content

SPECS: Displacement: 0.18 cu in (3.0cc)
Weight: 8.64oz (245g)
Bore: n/a
Stroke: n/a
Power Output: n/a
Practical RPM: n/a
Crankshaft Thread: 5mm x 14mm
On-Center Mounting Holes, Front to Rear: 0.43" (11mm)
On-Center Mounting Holes, Side to Side: 1.24" (31.4mm)
On-Center Exhaust Mounting Holes: 1.08" (27.5mm)
Back of engine to front of drive washer: 2.23" (56mm) Excluding Recoil
Height: 3.25" (83.7mm)
High speed needle: 2 1/2 turns out from closed position
Low speed needle: Screw in until flush with outside of carb body,
then screw it in 1/2 turn.
COMMENTS: The HGIC9301 yank eliminator fits onto this engine, but the modeler
is on their own to make it work properly.
[link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXCLU2&P=7[/link]