Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


Avoiding stuck reed Cox_ba12




Avoiding stuck reed Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
July-2021
Kim's

"Rusty's RR-1 runs up on the Q-Tee on a beautiful Summer S.M.A.L.L. Day."




PAST WINNERS
CEF Traveling Engine

Win This Engine!
Forum Store
CEF Ear Savers
Gallery


Avoiding stuck reed Empty

Avoiding stuck reed

Go down

Avoiding stuck reed Empty Avoiding stuck reed

Post  dirk gently Wed May 15, 2019 2:34 pm

Hello friends,

I'm sure this is nitro engines 101 and bread and butter for most of you, but I haven't been able to find a definitive solution for this problem I'm facing.

Each time I buy a used reedie, or try to start one that has been sitting for a few weeks, the engine will only run on prime for a second or so, but will not draw any fuel from the tank. I'm fairly sure that the issue is that the reed gets gummed up with oil, as disassembling the engine cleaning the reed valve resolves the issue every time. Problem is, removing the engine from the model to take it apart and clean it is a major pain, and I find myself having to do it more often than not.

Is there any after-run engine care procedure that would help me avoid this? I am draining the tank, of course after run, burning off any fuel left over in the fuel line, and I wipe the outside of engine with a paper towel. I use a commercially available nitro fuel with 10% oil, which is, according to the manufacturer "a mixture of synthetic and castor oil" (proportions not given), plus I add enough castor to make it 20% oil overall.
dirk gently
dirk gently
Gold Member
Gold Member

Posts : 429
Join date : 2012-02-03
Age : 38
Location : Poznań

Back to top Go down

Avoiding stuck reed Empty Re: Avoiding stuck reed

Post  aspeed Wed May 15, 2019 3:05 pm

I am going to run one soon after many years. I will just dribble a bit of fuel into the backplate with it upside down, flip it a few times and repeat till it gives the right "sound". I will maybe have to take it apart, probably not.
aspeed
aspeed
Platinum Member
Platinum Member

Posts : 577
Join date : 2013-01-18
Location : Leamington Ont. Can.

Back to top Go down

Avoiding stuck reed Empty Re: Avoiding stuck reed

Post  Ken Cook Wed May 15, 2019 3:19 pm

I've found removing the plug and putting about 5-10 drops of air tool oil or trans fluid into the cylinder. Make it run into the port and not out the exhaust cutouts. The problem is not only related to the reed. The pickup tube itself can get congealed and the orifice for the needle valve. Therefore removing the needle and putting a few drops in there can help. Screwing the needle in forces the oil to go into the venturi and can also prevent clogging.
Ken Cook
Ken Cook
Top Poster
Top Poster

Posts : 4406
Join date : 2012-03-27
Location : pennsylvania

Back to top Go down

Avoiding stuck reed Empty Re: Avoiding stuck reed

Post  pkrankow Fri May 17, 2019 10:44 pm

Spraying fuel into the reed via overfilling the tank with the vents closed and the needle open, or down the choke tube on surestarts or dribbiling up the bottom nose down with horseshoes will do a treat on engines acting gummy. Let them sit 20 or 30 minutes then flip some, top them up and try to start.

Basicly deliberately flooding, then letting evaporation clear it. This has saved many an outing.

Phil
pkrankow
pkrankow
Top Poster
Top Poster

Posts : 3025
Join date : 2012-10-02
Location : Ohio

Back to top Go down

Avoiding stuck reed Empty Re: Avoiding stuck reed

Post  Cox International Mon May 27, 2019 3:16 pm

This product should prevent gumming up, even after many years of sitting idle: https://coxengines.ca/coxlube-after-run-oil.html

The not-so-subtle advertising aside, this part makes us cringe: (fuel with 10% oil, which is, according to the manufacturer "a mixture of synthetic and castor oil").

Unless you want to contribute to our parts sales, we don't recommend running a Cox engine with so little oil in the fuel mixture. Somewhere in the 18% - 22% range is recommended. Also "mixture" can be as little as 10% castor and 90% synthetic and, under that scenario, especially in conjunction with a low oil content in general, will most likely lead to premature engine failure.
Cox International
Cox International
Top Poster
Top Poster

Official Cox Dealer
Posts : 3093
Join date : 2011-08-08
Age : 63
Location : Williams Lake, BC, Canada

http://www.coxengines.com

Back to top Go down

Avoiding stuck reed Empty Re: Avoiding stuck reed

Post  dirk gently Fri Jun 14, 2019 2:31 pm

@pkrankow wrote:Spraying fuel into the reed via overfilling the tank with the vents closed and the needle open

I just tried this today and can confirm it works. The small downside is that the engine is completely flooded afterwards, but it sure beats having to take the engine out and disassemble it. Thank you for this tip.
dirk gently
dirk gently
Gold Member
Gold Member

Posts : 429
Join date : 2012-02-03
Age : 38
Location : Poznań

Back to top Go down

Avoiding stuck reed Empty Re: Avoiding stuck reed

Post  ticomareado Sat Jun 15, 2019 9:05 am

Just be sure to dirk her gently when you squeeze the fuel bulb. Otherwise you might loosen up something you'd rather not.
ticomareado
ticomareado
Account Under Review

Posts : 1089
Join date : 2013-10-03
Location : NC

Back to top Go down

Avoiding stuck reed Empty Re: Avoiding stuck reed

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum