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Model Forum / Radio Controlled / Air Models / June 20044 stroke advice please
Just been trying to set up a new SC120 4 stroke for my son in a P51. Had a few tanks through it now and it seems OK but I'm a bit worried about the needle valve setting? It will only run OK with the needle about 1 turn open. Is this right? I always thought it should be about 2 to 2.5 turns. We ran it in at about a 5 turn setting and have slowly closed this down as it ran in. Idle is fine and it seems to go to full throttle fine but changing the needle valve doesn't seem to do much at all. I've only ever set up 2 strokes before and I know on them that setting the needle valve changes the engine speed quite a bit. TIA cheers, Len It is OK to run the engine at the setting where the engine runs the best. The number of turns out is completely irrelavent unless it changes drastically. -- Paul McIntosh http://www.rc-bearings.com > Just been trying to set up a new SC120 4 stroke for my son in a P51. > Had a few tanks through it now and it seems OK but I'm a bit worried [quoted text clipped - 10 lines] > cheers, > Len >It is OK to run the engine at the setting where the engine runs the best. >The number of turns out is completely irrelavent unless it changes >drastically. Paul, Thanks for the info. I've just put another tank of fuel through it and it runs perfectly, tickover, full bore with the neddle vale about 3/4 out! Gonna leave it like that as it seems to run just fine. Thanks cheers, Len Wouldn't suprise me in the least - about normal for them ~(but whatever you do make SURE you are running rich).  SignatureRay Fisher > Just been trying to set up a new SC120 4 stroke for my son in a P51. > Had a few tanks through it now and it seems OK but I'm a bit worried [quoted text clipped - 10 lines] > cheers, > Len >Wouldn't suprise me in the least - about normal for them ~(but whatever you >do make SURE you are running rich). I agree competely. you should see a nice smoke trail- at least I do down here in South Florida. Recommend that you set your RPMs with a tach or temp gun, not your ear. Good luck with it. Andy We can make a box of wood.....FLY!! |
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