I have the old style ASP 61 two stroke and it was running fine 6 months ago, oiled and put up, now it is hard to adjust the settings... I do not have the manual or instructions and can not remember how to adjust the two needles...Any recommendations? Also there is a screw adjustment on the carburator near the main needle arm adjustment ...what is its purpose and how to adjust... Considering a new carburator so what would you recommend as this was a powerful good running engine ... Thanks

Richard,

It wouldn't hurt to try a new glow plug. Don't throw the old one away, just stick it in your flight box. Your fuel could have gone bad also?

The screw near the throttle arm on the older ASP's holds the barrel inside the carb. On the new ones, The screw is not adjustable. You just tighten it down all the way. But on the old ones, you had to back off the jam nut and adjust the screw inwards until the barrel began to jam and then back it out until just where the barrel was free again. Then while holding the screw from moving, tighten the jam nut.

As far as I'm concerned there's nothing wrong with the new ASP carbs. You can get a brand new one from Horizon Hobbies or your local hobby shop. A friend just ordered one for his 61 this week. If you live in a counntry other than the US, you might want to buy your carb from Just Engines in England. BTW, the Magnum, ASP, & SC engines are all common if you stay within the same age engine. You can get magnum parts for your ASP from Hobby People.

On a few of the older carbs,the spring that holds the carb barrel towards the throttle arm was weak and the barrel would flop back and forth. I always got a stronger spring from the hardware store and no more trouble.

Enjoy,

Jim

Jim, there are two screws on the top of the carb...the one on the left facing the engine is there to hold the barrel in the carb and maybe to make adjustments...there is another screw on the right side of the carb near the main needle valve...that is one I am not sure about for adjustments...I appreciate your info and will try a new glow plug this weekend...Richard

The one one the back side by the high speed needle valve is the idle speed adjustment. It will control how far closed the throttle will go. Now days, when the engine is mounted on the airplane, people just back it out to where the throttle will go completely closed. This screw is on both the new and old style carbs.

Enjoy,

Jim

Thanks again Jim....I have had a problem with getting the idle slow enough for the engine to stop and all of my throttle adjustments are maxed out in the direction of closing the throttle, can I correct that by backing that screw out? ...I have a new can of gas and a new plug for this weekend...thanks.. Richard

Yes. Adjust the screw out some to where you can push the carb all the way closed with your finger.

Then you may have to adjust the center position of your servo to get your end points correct?

Enjoy,

Jim

That is good info Jim and I will do...take care and thanks.. Richard