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Old 04-06-2009, 02:40 PM
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I Recently acquired a Novarossi S21 with a O'Donnell's cooling had.. i ran it for a little bit now For the new season id like to send the piston and sleeve off to Os-Rocket for a pinch. (now is where the problem lies)

Almost all of the engines i have worked on have HEX head screws that hold the cooling head on. The Novarossi for some reason has Flat-head screws holding the head on the block. They seem to be in their so good that i cannot get them out.. I have twisted two flat head screwdrivers. trying to get them out they just will not budge.

Is their anyway possiable getting these things out so i can send the sleeve and piston off and have a good engine by time the dirt season comes around??

any suggestions would be greatly appreciated.

Thanks in advance..
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Old 04-06-2009, 02:45 PM
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heat it up and use a good quality screwdriver
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Old 04-06-2009, 03:39 PM
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http://www.amainhobbies.com/product_...oducts_id/8382

Is what I use.

Here is a cheaper version

http://www.amainhobbies.com/product_...ducts_id/33341
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Old 04-06-2009, 03:55 PM
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Originally Posted by imjammin View Post
heat it up and use a good quality screwdriver
yup use a propane torch and a good screw driver
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Old 04-06-2009, 03:55 PM
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heat the head up and use a screwdriver that fits perfectly, you do not want a screw driver that plays in the - slot you want a snug fit and put pressure down on the head when you are unscrewing.
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Old 04-06-2009, 05:24 PM
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All screws are out and the piston and sleeve will be going out for its pinch. tomorrow.. one more question though


does anyone know the factory needle settings for the Novarossi s21 p5x

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Old 04-06-2009, 06:05 PM
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no chance of getting a screwdriver back on it? IF you can; try to put some heat on the BLOCK where the stuck screw is (the screw thread's into the block NOT the head) after you warm up the block try to tap the head of the screwdriver handle while turning it to give it a bit of a helping hand!

if you ever used an impact driver you will know what i'm reffering to
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Old 04-06-2009, 07:25 PM
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Originally Posted by big_dog1893 View Post
All screws are out and the piston and sleeve will be going out for its pinch. tomorrow.. one more question though


does anyone know the factory needle settings for the Novarossi s21 p5x
Carb settings........

http://www.novarossi.com/content_uk/...y-engines.html
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Old 04-06-2009, 07:28 PM
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oops... forgot the s21

http://www.novarossi.com/content_uk/...r/s21p3xst.htm

Carb settings on the left.
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