What would cause this

[Stygian]

Ok im looking at my xb that doesn't want to start to try and figure out why, it has a bunch of oil and what not all around the engine it's self, I have removed the carb and exhaust and took a few pics to show. Anyone know what would cause this and what I should look into first and if it could be the head gasket, anyone have a link to a diagram on how it comes apart, because I have never taken one of these engines apart before. Just a few notes, this XB is only about one month old and has only had one tank of gas ran through it.

 

[Ryneito]

Looks like an exhaust leak

 

[Guest]

To me it looks like the oil is above the head gasket and the gasket area looks clean. To me it looks more like an exhaust leak. An exhaust leak would not cause your starting issue.

 

[Stygian]

Looks like an exhaust leak

That's what I was thinking, I pulled off the exhaust and the gasket for the exhaust was so damn caroted (spelled wrong) that I just threw it away, need to order another one. If it is from an exhaust leak that would cause it not to start and possibly keep flooding the engine right?

 

[Stygian]

To me it looks like the oil is above the head gasket and the gasket area looks clean. To me it looks more like an exhaust leak. An exhaust leak would not cause your starting issue.

Aahh ok, where should I start looking to solve the starting issue, I have already reset the H and L to factory got it unflooded but it keeps reflooding after like 5 pulls.

 

[Guest]

Are you getting spark?

 

[Stygian]

Are you getting spark?

Yep, I tested it on the head and on the exhaust pipe and saw a nice spark.

 

[rampagemt]

Changed plug? I would even try a new coil

 

[Guest]

You might need to lean out the L needle. Try only one turn out. Try starting with no choke also. The factory carb is hit and miss. I've had one that had to be really lean to run.

Air leaks behind the carb and or insulator (manifold) can also make it very hard to start.

 

[Stygian]

Changed plug? I would even try a new coil

I haven't tried that yet, I did buy 2 new plugs though so I should try that, does the exhaust have to be on for it to fire up or can it be left off as I need to replace the gasket?

 

[Guest]

You need to have the exhaust on. You need to have a little back pressure.

 

[Stygian]

You might need to lean out the L needle. Try only one turn out. Try starting with no choke also. The factory carb is hit and miss. I've had one that had to be really lean to run.Air leaks behind the carb and or insulator (manifold) can also make it very hard to start.

Yeah I have been using no choke. When I took the carb off the gasket that was by the carb and black piece it mounts too was pretty carotid and so where the gaskets, will clean them all off and put the carb back on and put in a new plug and see what happens and will have to wait to get a new gasket for the exhaust blah

 

[Stygian]

RCDad would an exhaust leak cause oil to be carotid on both sides of the engine where the exhaust is and where the carb is, because both sides of the engine was carotid with oil like it was leaking all over.

 

[Guest]

Yes the flywheel has the fan blades. Even a small exhaust leak will cause oil to be everywhere.

 

[Stygian]

Aahh OK putting it all back together now hopefully it will fire up

Sent from my Nexus 4 using Tapatalk 2

 

[rampagemt]

Good luck let us know how it goes

 

[Stygian]

Will do I have everything back together and the new air filter on it and unfortunately do to the time it will have to wait until tomorrow to see if it will start

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[rampagemt]

Start it up I'm sure your neighbors will like it

 

[Stygian]

Start it up I'm sure your neighbors will like it

Oh its hard to hold back. I don't need the cops called on me lol

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[Ted Hartman]

Xb will not start

I just went thru all this with a new Dune Runner. If I were to hold the throttle open and pull 20 to 30 times it would start. Talked to,redcat tech support and they wanted me to send them the engine. Instead, I called DDM and bought a new carb from them. Problem solved. Cheaper than shipping an engine. Some times warranties don't always work.

I had an oil leak on my now 20 day old XB and found the leak to be the exhaust flange to pipe joint. Redcat is in the process of shipping me a new pipe under warranty.

I know my solution is to buy a new 668 from DDM but it is the best thing to do with any redcat. Put a real carb on it, then go play, leave the knock-offs in china.

Hope this helps in some way

Ted