CY 29CC no start

[Minnesota RC]

Fellas, I am not getting fuel to the cylinder head and instead of being sucked in, the fuel is being pushed out from the carburetor. I am at a lost for why this is happening.

 

[Seandonato73]

That's a bit odd. I mean it's normal for a two stroke to spit some fuel out the carb, but not to the point where its dripping out. You sure you got good fuel going to the carb? Kinda odd for crank seals to give up the ghost. Check for intake leaks and such?

 

[Phill2]

Fuel lines on the right way?
Inlet to the bottom - outlet to the top.

 

[Minnesota RC]

Fuel lines on the right way?
Inlet to the bottom - outlet to the top.

Yep. The fuel lines are in the correct locations. All gaskets were tight.

 

[cbaker65]

Yep. The fuel lines are in the correct locations. All gaskets were tight.

Did you have this engine completely tore down with piston off?

 

[Minnesota RC]

Yes, the head was leaking and a gasket needed to be replaced.
Made my own gasket from a gasket sheet.

 

[cbaker65]

Yes, the head was leaking and a gasket needed to be replaced.
Made my own gasket from a gasket sheet.

I asked because if the piston was put on backwards ,could that make the pressure out of the intake?
I wouldnt know ,I never had put one on backwards ,so I don't know if it actually could!...

 

[Seandonato73]

Should have an arrow that points to the exhaust side.

 

[Minnesota RC]

The piston didn't move and couldn't rotate. The cylinder head can only go in the same way it came out otherwise the exhaust would be on the opposite side. I didn't remove the piston from the rod.

 

[Seandonato73]

Did you use about the same thickness gasket?

 

[Minnesota RC]

It might be a mm thicker but believe its very close.

 

[Seandonato73]

Hmm, that shouldn't be it then. At least not enough I don't think. Yeah rightly stumped mate. Feel like it has good compression?

 

[Minnesota RC]

Similar to the losi
It has spark, that I can confirm.

 

[Minnesota RC]

Instead of getting a new engine, and knowing that there is something wrong with the cylinder head/crank case, could I just buy a long block and transfer parts from the old to the new? If its a CY 29 CC is that the same as a CY29RC?

Or should I get a brand new engine? Could I get a larger CC long block?

 

[Z.hb71]

Is pulse hole blocked? Have you tried dumping a bit of gas down the intake or plug hole to see if it will light off at all?

Instead of getting a new engine, and knowing that there is something wrong with the cylinder head/crank case, could I just buy a long block and transfer parts from the old to the new? If its a CY 29 CC is that the same as a CY29RC?

Or should I get a brand new engine? Could I get a larger CC long block?

Cy 29 and cy29rc are likely the same thing . And if they are not the parts will still transfer just fine.

 

[Minnesota RC]

CY29 is a two bolt, I'd need a four bolt which would be the G290RC

 

[Z.hb71]

CY29 is a two bolt, I'd need a four bolt which would be the G290RC

All your stuff will transfer, the front bolt on the shroud ain't Gunna line up tho
Clutch housing might be different but my rovan cy rip off housing fit my zen

 

[Minnesota RC]

But regardless, the Zenoah 31.8 long block would work fine, including fly wheel, clutch housing, etc?
I'd want everything to line up though.

 

[Z.hb71]

But regardless, the Zenoah 31.8 long block would work fine, including fly wheel, clutch housing, etc?

No, the 320 is different. You need different clutch housing, shroud, and intake manifold (i think). Rest is the same as far as I know

I'd want everything to line up though.

Buy a zen Shroud then, they are like 10 bucks

 

[Minnesota RC]

No, the 320 is different. You need different clutch housing, shroud, and intake manifold (i think). Rest is the same as far as I know

Buy a zen Shroud then, they are like 10 bucks

Right. And to answer your question about putting fuel into the cylinder itself, I did do that as well and nothing happened. Not even a pop.