Spinning but not catching?

[00.warrior350]

I recently purchased a 1991 yamaha warrior. I replaced the timing chain and timing chain tensioner. Once I started it, it ran fine for about 30 seconds then it cut off. When I tried starting it again the crank just spins and spins almost like it's not catching. Does anyone know what might be causing this? The one way seemed fine when put back on. Thank you in advance for the help.
View attachment 20241031_151139.mp4

 

[beastlywarrior228]

Sounds like no compression.

 

[00.warrior350]

Sounds like no compression.

Could that be from a bad top end? It was smoking quite a bit when I had it running

 

[beastlywarrior228]

Yeah or you bent a valve

 

[00.warrior350]

Yeah or you bent a valve

I adjusted the valves before I started it and they looked fine. And what sucks is that the guy who sold ot to me said that he just put a new top end in it. Anyways thanks for the help

 

[PineyPower]

Check your flywheel keyway didbt break or strip, the timing marks will look ok but the marks won't be clocked to the crank correctly

 

[00.warrior350]

Check your flywheel keyway didbt break or strip, the timing marks will look ok but the marks won't be clocked to the crank correctly

Ill check the flywheel key. Thank you

 

[00.warrior350]

Found the problem. The bolt that holds the cam sprocket to the cam was loose. But now it's making a ticking/knocking noise. Any ideas on what it might be?

 

[00.warrior350]

Found the problem. The bolt that holds the cam sprocket to the cam was loose. But now it's making a ticking/knocking noise. Any ideas on what itight be

There's a chip in the cylinder head causing the exhaust leak. I'm buying a new top end and cylinder head so hopefully that fixes the noise and smoke.

 

[beastlywarrior228]

That's not good. Typically when the cam bolt loosens up it shears the pin and ruins the cam.

If buying a new head do not buy the Chinese ones.

 

[00.warrior350]

That's not good. Typically when the cam bolt loosens up it shears the pin and ruins the cam.

If buying a new head do not buy the Chinese ones.

The pin looked perfectly fine. What's wrong with the Chinese heads? I might have to cancel my order

 

[beastlywarrior228]

The pin looked perfectly fine. What's wrong with the Chinese heads? I might have to cancel my order

Cheap material, smaller ports, cam and rockers made out of cheap material so they trash themselves right away. Trust me cancel the order. I've seen it too often.

 

[beastlywarrior228]

Post pics of what's wrong with your head. It could probably be fixed for a reasonable price.

 

[00.warrior350]

Cheap material, smaller ports, cam and rockers made out of cheap material so they trash themselves right away. Trust me cancel the order. I've seen it too often.

Alright thank you. I'll go for a used oem then

 

[00.warrior350]

Post pics of what's wrong with your head. It could probably be fixed for a reasonable price.

I can't get a pic right now but where the exhaust stud screws in at chipped/broke so there's only one bolt holding the exhaust one. It's a decent sized chunk missing

 

[The_Mistress $$$]

I can't get a pic right now but where the exhaust stud screws in at chipped/broke so there's only one bolt holding the exhaust one. It's a decent sized chunk missing

Should just send the head too dune recer weston drw performance and see if he can just fix your head and set it up properly that's your best bet

 

[beastlywarrior228]

Should just send the head too dune recer weston drw performance and see if he can just fix your head and set it up properly that's your best bet

Yes he can fix that easily.

 

[00.warrior350]

Should just send the head too dune recer weston drw performance and see if he can just fix your head and set it up properly that's your best bet

There's a guy not to far from me who can do this I think so I'll give him a call and see how much it'll be.