.90 idle to full problem

[mgarciah]

Im breakin a .90 on a stand, using a 13x5 propeller, I can get a very reliable idle but when I go further than 1/2 open throttle the engine stops suddenly, according with the manual this is a rich condition for the neddle valve, but I closed from 3 turns from close to 1.5 turns from close step by step and the condition remains, I dont want to install this engine on my 90SE on that condition, I know the propeller colds the engine very good, dont know if this condition will change when the engine is mounted on the heli. any advice will be great.

[mgarciah]

Hey problem solved!!, I was using an old airplane tank that has three hole, one for the clunk, the other for filling (which I was using it for the pressure line from muffler) and the third for overfill spilling, ok this last one was open, so I have no pressure on the system, which gaves me the above condition, now I shutted that line with an screw and the engine runs great from idle to full.

So lesson learned, always keep the pressure system in good condition.

[hawkman]

Be very careful when you do fit the engine to the helicopter....the loads will be different to that of a propellor....you might need to readjust the carb settings slightly....go carefully.

Rob

[mgarciah]

Good advice, I will and keep posted

[3dee]

you will need to keep the nitro content high to start with. you may have to have the needle set out a bit more i have a raptor 90 with a full comp. spec engine with perry pump and my needle is over three and a half turns out with 20% nitro and full sinth oil so dont exspect it to run right, straight away. and make sure your carb setting are right if you start the engine up and it gos fast you will burn out the clutch right away and may damage you and the helly. have some one hold the transmiter for you with a finger on the throttle hold switch. safety first good luck. 90s are great you will never go back to a little one again.