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Cox Engine of The Month
September-2023
balogh's

"Beefed up old stock 290 on my Quickie100 RC after plenty of airtime hours..."

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Older OS FS-120 parts

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Older OS FS-120 parts Empty Older OS FS-120 parts

Post  dgundling Mon Jan 24, 2022 10:40 pm

I picked up an older OS-FS-120 surpass through ebay. Tha version I have has the twin rocker covers. Newer versions have a single rocker cover, I think. Does anyone know what size metric screws were use to hold the twin rocker covers down?

Thanks.

Dave Gundling
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Post  getback Wed Jan 26, 2022 8:39 am

Dave do you have a picture of this engine? I can't find one with two valve covers .
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Post  gkamysz Wed Jan 26, 2022 9:35 am

I don't have one of the early FS-120, but it's going to be M2.6 based on all the others.
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Post  getback Wed Jan 26, 2022 9:47 am

that's what I was thinking , Thanks Greg
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Post  sosam117 Wed Jan 26, 2022 3:45 pm

gkamysz wrote:I don't have one of the early FS-120, but it's going to be M2.6 based on all the others.

If you need to get that metric screw size McMster-Carr has that size.
You just need to know the length?

Here is the web page for that metric screw:
M2.6 x 0.45 x ???? what ever the length you need?

https://www.mcmaster.com/screws/system-of-measurement~metric/thread-size~m2-6/

I have to use this size screws on the smaller Enya .09 engines (like the .09-II)
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