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O ring leaking.

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Robert Putley 121/09/2019 03:23:42
183 forum posts

I purchsed an MDS 18 r/c some years ago. I recently built a Mini Super for this and it flies well.

The motor is powerfuland nicely balanced. Problem is it does not run consistently .Yesterday I noticed after starting up, fuel flowing around the N/V O ring.

Question...Is this a general problem, and is it possible to obtain a replacement?

Tom Sharp 221/09/2019 03:59:33
3512 forum posts
18 photos

Ripmax, the importers, did provide a free replacement O ring set years ago. It was a common problem.

Engine Doctor21/09/2019 09:50:33
2295 forum posts
27 photos

Look up a local bearing factor as they also supply "o" rings and take the old ring to them for measuring . Failing that it's just luck trying the classifieds etc. I have been looking for a piston for the MDS 148 for months now but no luck but things like "O" rings and bearings are generic parts so you should be in luck.

ken anderson.21/09/2019 11:03:56
8432 forum posts
772 photos

hello Robert, will a small bit of fuel tube fit over to keep you going...

ken tube dept.

GONZO21/09/2019 14:53:35
1263 forum posts
14 photos

Got several of these.

point 1/ make sure the NV ratchet spring is not pushing too hard on the needle and displacing it sideways.

point 2/ try modelfixings for 'o' ring Modelfixings (and lots of other useful items)

point 3/ measure distance between needle knurled inner shoulder to outer face of NV body when needle is in running position. Cut, ends to be square, a slightly longer piece of fuel tubing and install in this gap to act as a secondary seal(needs to be slightly squashed).

Phil Olson - Model Technics23/09/2019 11:04:21
31 forum posts

my fav' bodge is to put a bit of heatshrink tube under the 'o' ring

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