Fresh rings, no start

[portedmetal]

Well I took the motor apart, and changed the rings, and now it doesn't start. The timing is right, I believe the coil gap is right, but no start. I need help trying to figure it out without having to tear it apart again. I did notice the gasket between the head and plastic spacer is broken, would that have an effect?

 

[fowler]

assuming u are talking of the gasket between the engine and carby then yes it is vital this gasket is good and working

well for that matter it is vital all gaskets and good and working

the broken gasket is letting the engine suck air though the hole rater than mixture though the carby

put a tea spoon of petrol into the plug hole and try to fr it up
if u get a few fires this is your issue

as a point of future referance
if u ever break a seal or gasket or find a damaged one then just replace it
it saves alot of trouble later on

if u work on bigger equpment at some point u will find stuff that can be badly damaged by a faulty seal or gasket

 

[portedmetal]

Yea its the gasket between the engine and the black insulator.

 

[kendelrk]

air leak

 

[portedmetal]

I also had some chrome/moly pushrod installed and noticed one was slightly bent. I am using my old pair for now untill I get some more. What can cause a pushrod to bend? It's the exhaust pushrod

 

[bighead]

Does it have spark?

 

[portedmetal]

Sure does

 

[DustinWolfe]

valve lash?

 

[s10king91]

What kind of motor are you working on Is it a OHV or Flathead Briggs
If it is a Ohv Motor your Valves are out of adjustment or your timing is off and the piston smacked a valve.
If it is a flat head Maybe the length was to long maybe the lash was not right or maybe it was a defect
I think i covered most of it lol

 

[fowler]

How bout he replaces the $4 gasket before he strips the engine

Do the simplest fix first
He can't run a rooted intake gasket anyway

 

[DustinWolfe]

What kind of motor are you working on Is it a OHV or Flathead Briggs
If it is a Ohv Motor your Valves are out of adjustment or your timing is off and the piston smacked a valve.
If it is a flat head Maybe the length was to long maybe the lash was not right or maybe it was a defect
I think i covered most of it lol

it has pushrods......

i think fowler is correct though i assumed he had checked the gasket after it was mentioned

 

[fowler]

like i said if u put some petrol down the plug hole and u get some action then the gasket is the issue

u need to change it regaurdless

 

[portedmetal]

Hey sry for no replies I been busy at work. It's a gx200. I changed the broken gasket, and changed the pushrod. The timing and valve lash are both correct. I poured gas in the spark hole and got a Lil action from it. It still won't run. I also changed the head gasket its a Lil thicker. I went ahead and changed the valves also as I had a new spare set. One question I have is that I have a side cover gasket for a 4 bolt motor but I have a 5 bolt motor. Would this be an issue?

 

[r_chez_08]

Doubt the side cover gasket would make any ods.
Fuel (tick)
Spark (tick)
Compression?
Timing?

The thicker head gasket reduces compression. I expect it would still start, but you will get a performance loss.
Check the cam timing (the dots on crank and cam should line up)
Also check valve lash, and flywheel key.
Make sure the kill switch is not grounded due to a damaged wire or something.

You can try spraying easy start in the carb then cranking over as an alternative to gas down the plug hole.

 

[jamyers]

I just went through the same thing: rebuilt engine that wouldn't run, or if it did it was like carp.

Turned out to be: (1) Flywheel was shearing its key making the ignition way off, and (2) new carb-to-manifold gasket was a HAIR bigger than the old one, and with the slop in the bolt holes it was uncovering the carb vents to intake vacuum.

I fixed (1) by putting valve-grinding abrasive compound between the crank & flywheel and lapping them together, then torquing the nut down to spec (which is a lot harder than I'd guessed the first 2 times). Fixed (2) by reusing the old (not torn, just compressed) carb gasket with a thin coat of copper gasket compound.

Hope this helps!

 

[portedmetal]

With the thicker head gasket I did notice not as much compression when trying to start. I know there is a compression release on the cam but I can still tell the difference. I never would have guessed the flywheel key could be the problem, I'll have to check that out next time I am off of work. The cam is lined with the crank.

 

[fowler]

did u make sure the ring gaps where in the correct place
if u lined them up it wont work

 

[sideways]

So you poured fuel down the spark plug hole and it ran for a second?

Then you have a fuel issue, end of story.

Have you set the valve clearances correctly?

 

[portedmetal]

Ring gaps are in the correct position. It didn't really run, it just sputtered and shot a flame.

 

[sexyvicta]

check the key on flywheel then