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O.S. .90 tuning.. only one needle?

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O.S. .90 tuning.. only one needle?

Old 04-21-2005, 09:22 PM
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Default O.S. .90 tuning.. only one needle?

While tring to run my 54" dumas w/O.S. 90 it would always die if I gave it over 1/4 throttle. It would rev up like it was running out of gas...The exhaust pressure hose is hooked up ... I screwwed the main needle out several times but nothing really changed. I'm looking for another adjustment needle but can't find one on the 0S .90 ...don't all nitros have a high and low adjustment? one near the fuel line inlet and one near the throttle lever? It seems to run good out of the water with no load on the prop. Please help...! Thanks...........
Old 04-21-2005, 09:28 PM
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Default RE: O.S. .90 tuning.. only one needle?

There might be a low speed int the part where the servo linkage hooks up. (in the middle of it)

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