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Building Tips and technical articles. => 1/2 A building. => Topic started by: Bootlegger on September 25, 2016, 07:26:52 AM

Title: edle valve spring
Post by: Bootlegger on September 25, 2016, 07:26:52 AM

   Guy's I need a needle valve spring for a Cox Medallion .049 engine. Where can I get one?   Thanks

Title: Re: edle valve spring
Post by: Tim Wescott on September 25, 2016, 10:43:32 AM

A length of silicone fuel tubing works well for me.  Pick a diameter (medium) and length (around 1/2 inch) so that it's compressed a bit at the right setting, but not riding over the shoulder on the needle valve.

Or, Cox International (http://coxengines.ca/cox-.049-needle-spring-babe-bee-3.html).

Edit: I only just now noticed that yours is a Medallion, not a reedie.  The fuel tube should still work but I don't have personal experience with that one.  If not, Cox International has needle stuff for Medallions, too.

Title: Re: edle valve spring
Post by: Fredvon4 on September 25, 2016, 11:12:30 AM

What Tim said I my method also... if you find the Needle step is to small a diameter and is sliding into the fuel line, use a small #2 washer it fits over the threads but wont pass the first step before the knob

Trick is finding the running needle setting and then cut the fuel line just barely a tad longer but not too much

seals out air, stops vibration changes of the needle

Title: Re: edle valve spring
Post by: david beazley on September 25, 2016, 05:28:00 PM

How about a spring out of a ball point pen?

Title: Re: edle valve spring
Post by: Tim Wescott on September 25, 2016, 06:02:53 PM

Quote from: david beazley on September 25, 2016, 05:28:00 PM

How about a spring out of a ball point pen?

They're too wimpy.  If anything, fuel tubing works better than stock if you're willing to fuss with it a bit.