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Post  SuperDave on Tue Sep 13, 2011 9:19 am

GermanBeez wrote:yep. i will delete this topic in maybe 4 days or so. if he hasn't taken a look again, tough luck.
just trying to keep the number of "engine won't work"- topics at bay a little. just a housekeeping procedure. Smile

The speculations offered here might be useful to draw in some of the "lurkers into joining the forum.

As to speculations, I would offer the matter of the venturi gasket which is so often overlooked in such problems.

SD
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Post  SuperDave on Tue Sep 13, 2011 9:57 am

beez:

A bad or missing venturi gasket will most surely cause fuel-starvation problems as described here.

BTW, the Sure-Start does NOT have a carburetor.

You might note the two types of Cox fuel induction systems: reed and rotary valve as found on the Cox TEE DEE series.

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Post  nitroairplane on Tue Sep 13, 2011 11:36 am

And rear rotary or drum valve found on the rr1.
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Post  GermanBeez on Tue Sep 13, 2011 1:29 pm

SuperDave wrote:

As to speculations, I would offer the matter of the venturi gasket which is so often overlooked in such problems.

SD
i thought you were referring to the tee dee 020... Very Happy
and yes, i do know that the engine series differed mainly in their intake system. i'm not that new to the hobby
as everyone appearently thinks. Smile
ok, i will leave this topic open for reference, but i would ask everyone to only post something if it has something
to do with the sure start issue, as the discussion on top is running off topic. thank you for your consideration.
Dave
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Post  RknRusty on Tue Sep 13, 2011 4:07 pm

A Surestart has no venturi gasket.
But a leaky crankcase gasket could cause a similar problem.

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Post  GermanBeez on Tue Sep 13, 2011 4:20 pm

sigh....are we finished with the darn gaskets already! Rolling Eyes
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Post  SuperDave on Tue Sep 13, 2011 4:29 pm

GermanBeez wrote:sigh....are we finished with the darn gaskets already! Rolling Eyes

beez:

Your impatience is quite evident. Most two-strokers rely on crankcase pressure to induce fuel into the cylinder.

sleep " Ya snooze, ya loose"

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Post  microflitedude on Tue Sep 13, 2011 4:47 pm

RknRusty wrote:A Surestart has no venturi gasket.
But a leaky crankcase gasket could cause a similar problem.

Isn't it only tanked engines that have those?
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Post  nitroairplane on Tue Sep 13, 2011 5:04 pm

Yes only engines that have metal to metal contact.
Not tee dee .010 or .020.
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Post  SuperDave on Wed Sep 14, 2011 9:04 am

HOLY SOCKS, BATMAN!

Considering the age related-deterioration potential of Cox gaskets, I make it a standard practice to replace all of them when "refreshening" any COX. So doing is an assurance they are actually present and not the cause of any run problem.

In the Surestart "no start" discussion the poster reported that the head gasket was missing and the engine wouldn't start. Well DUH?

Most often the most elementary of considerations are overlooked in the diagnosis of mechanical problems. A good diagnostician is very thoughtful in this regard.

Robin (aka: SD)

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Post  GermanBeez on Wed Sep 14, 2011 9:14 am

SuperDave wrote:HOLY SOCKS, BATMAN!

In the Surestart "no start" discussion the poster reported that the head gasket was missing and the engine wouldn't start. Well DUH?

Robin (aka: SD)

ehm, i just looked over what the topic's poster said about the engine. he did not say his gasket was missing...
but that could most certainly be a reason. my golden bee came without one, i have no idea how the guy who had it before
got it to run, because the compression was WAY too high. good thing that Matt has stocked me up with all the essential
parts which can wear out ( venturi gaskets, crank case gaskets, cylinder head gaskets, reeds, etc...)
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Post  SuperDave on Wed Sep 14, 2011 9:44 am

beez:

OK, I refenced the incorrect engine problem post yet my comments are no less valid.

SD





GermanBeez wrote:
SuperDave wrote:HOLY SOCKS, BATMAN!

In the Surestart "no start" discussion the poster reported that the head gasket was missing and the engine wouldn't start. Well DUH?

Robin (aka: SD)

ehm, i just looked over what the topic's poster said about the engine. he did not say his gasket was missing...
but that could most certainly be a reason. my golden bee came without one, i have no idea how the guy who had it before
got it to run, because the compression was WAY too high. good thing that Matt has stocked me up with all the essential
parts which can wear out ( venturi gaskets, crank case gaskets, cylinder head gaskets, reeds, etc...)
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Post  GermanBeez on Wed Sep 14, 2011 10:00 am

hmmm, you might just want to add your solution about the missing head gaskets to the sure start topic, so
people who visit the site have everything that could be wrong with their engine on one site! i think its amazing how
a piece of copper the thickness of a human hair can alter the compression of an engine that much.
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Post  nitroairplane on Wed Sep 14, 2011 10:14 am

I find it amazing that a piston as thin as a wire can make power.
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Post  SuperDave on Wed Sep 14, 2011 10:20 am

nitroairplane wrote:I find it amazing that a piston as thin as a wire can make power.

The theoretical and the practical often don't mesh even on a grander scale. Ask any engineer.

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Post  nitroairplane on Wed Sep 14, 2011 10:31 am

SuperDave wrote:
nitroairplane wrote:I find it amazing that a piston as thin as a wire can make power.

The theoretical and the practical often don't mesh even on a grander scale. Ask any engineer.

SD

the ronald valentine nano bee is 0.006cc or 0.00039 cuin imagine that piston.
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Post  RknRusty on Wed Sep 14, 2011 12:29 pm

GermanBeez wrote:sigh....are we finished with the darn gaskets already! Rolling Eyes
Now we are. Before my post there were two references to the nonexistent venturi Gasket and no mention of the Crankcase gasket. So I made one correction and one suggestion. tongue

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Post  GermanBeez on Wed Sep 14, 2011 12:33 pm

and split up the previous topic so we could talk gaskets all night and day long! Very Happy Very Happy Very Happy
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Post  SuperDave on Wed Sep 14, 2011 12:40 pm

[quote="RknRusty"]
GermanBeez wrote: "the nonexistent venturi Gasket "

On which Cox engine? I repectfully ask.

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Post  RknRusty on Wed Sep 14, 2011 12:44 pm

[quote="SuperDave"]
RknRusty wrote:
GermanBeez wrote: "the nonexistent venturi Gasket "

On which Cox engine? I repectfully ask.

SD
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The Surestart has no venturi gasket. That's the engine the guy was asking about iirc. Air goes in the back past the spraybar and right into the reed valve.
Maybe I'm mixed up about which engine we're talking about.

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