350 Rancher Engine problems

[JsheII3]

I saw the mark. I didn't think it was a crack. I'm wondering if there were metal shavings sitting on the ring though.

Yes, it comes with tools. One of them is a 45 degree mirror. It did me no good.

Hold please. Lol

 

[JsheII3]

I managed to do some voodoo and get the camera pointed back to the top. I can see valves. And the top of the nasty scar.

I wish I could have back away some, but your right @PistonHonda that 45• mirror is crap.

 

[Deleted member 3748]

I managed to do some voodoo and get the camera pointed back to the top. I can see valves. And the top of the nasty scar.

I wish I could have back away some, but your right @PistonHonda that 45• mirror is crap.

Actually, that's pretty good! I think your rings are gone. It looks like the piston is rubbing on the cylinder all the way to the top. I'm curious to see if a valve opens if you give it another crank turn. Sorry for assigning so much homework!

 

[Deleted member 3748]

I managed to do some voodoo and get the camera pointed back to the top. I can see valves. And the top of the nasty scar.

I wish I could have back away some, but your right @PistonHonda that 45• mirror is crap.

Oh, you didn't use the mirror?? You got the camera turned upside down?

 

[JsheII3]

Actually, that's pretty good! I think your rings are gone. It looks like the piston is rubbing on the cylinder all the way to the top. I'm curious to see if a valve opens if you give it another crank turn. Sorry for assigning so much homework!

That pull rope makes the piston move hella quick. And for me to get the camera down, around, and back up requires me to feed a lot of camera cord into the cylinder.

So I’m concerned that working the pull cord, to see the valve movements, might spell the end of my bore scope. Crunch.

 

[Deleted member 3748]

That pull rope makes the piston move hella quick. And for me to get the camera down, around, and back up requires me to feed a lot of camera cord into the cylinder.

So I’m concerned that working the pull cord, to see the valve movements, might spell the end of my bore scope. Crunch.

Yeah, don't do it with the camera in there. Is there a cap in the valve cover that shows us if the valves are moving? That's all I'm wondering about.

 

[Deleted member 3748]

That pull rope makes the piston move hella quick. And for me to get the camera down, around, and back up requires me to feed a lot of camera cord into the cylinder.

So I’m concerned that working the pull cord, to see the valve movements, might spell the end of my bore scope. Crunch.

I was also thinking you give it a pull, then put the camera down there and see if a valve is open. Odds are better that a valve would be open than both closed.

 

[GPR1500SC]

It looks like you need to bore out the cylinder and put in a over sized Piston in.

Cam and rocker arm's unknown?

 

[Deleted member 3748]

It looks like you need to bore out the cylinder and put in a over sized Piston in.

Cam and rocker arm's unknown?

Why are we bringing my weight into this?

 

[GPR1500SC]

Why are we bringing my weight into this?

Probably because you are a easy target

 

[Deleted member 3748]

Probably because you are a easy target

I'm really not. But you can try it out and see how it goes.

 

[GPR1500SC]

I'm really not. But you can try it out and see how it goes.

I really need to make it too the take over to meet some of you guys.

 

[HondaTech]

That cylinder is Fubar!

I'd go ahead a tear it down, you'll probbaly find the piston and rings welded together.

FYI, I've never seen a 350 Rancher with a worn cam, theyll melt and scar the cylinder and stop running before he cam gets harmed since it's in the block, not he head.

You can also see part of the top of the piston is chipping, it's been super hot. Notice the lack of black combustion residue on the piston. This thing has been lean and was melting down.

 

[snuffnwhisky]

Yep, the cylinder does not look good. Almost looks like the wrist pin and or rod bearing might have seized/spun and was trying to rock the piston in the bore. Definitely going to have to pull the top end at least.

 

[JsheII3]

That cylinder is Fubar!

I'd go ahead a tear it down, you'll probbaly find the piston and rings welded together.

FYI, I've never seen a 350 Rancher with a worn cam, theyll melt and scar the cylinder and stop running before he cam gets harmed since it's in the block, not he head.

You can also see part of the top of the piston is chipping, it's been super hot. Notice the lack of black combustion residue on the piston. This thing has been lean and was melting down.

Well. It won’t run. That’s for sure...
So do y’all like my new bore camera? $40. We should thank Piston Honda for that.

I found a parts rancher w newly rebuilt motor (top end), but a bad rear end.

My dad and I plan on swapping the whole motor.
Asking $700 for the ATV.

That’s the (new) plan anyways.

 

[JsheII3]

Also, thank you, everyone who’s chimed in and offered advice.
Oddly enough, these type of set backs make for great education.

Like I’ve learned 3 quarts of oil (or lack of) can make a big difference to your wallet and your weekend.

Seriously, I meant what I said, post #1... I knew if I posted here, I’d get the answers. Y’all good folk.

 

[Deleted member 3748]

Well. It won’t run. That’s for sure...
So do y’all like my new bore camera? $40. We should thank Piston Honda for that.

I found a parts rancher w newly rebuilt motor (top end), but a bad rear end.

My dad and I plan on swapping the whole motor.
Asking $700 for the ATV.

That’s the (new) plan anyways.

View attachment 143488 View attachment 143486 View attachment 143487

Perfect!

 

[JsheII3]

I’ll have to start a new help thread about motor swap.

We are picking up the parts bike today.
If No surprises.

$700 is less than $1,500 for just the engine, alone. Plus, with parts bike, I got battery, another set of tires, some plastics, and various cables, carbs, and more! Only 15+ years old. Lol

 

[Deleted member 3748]

I’ll have to start a new help thread about motor swap.

We are picking up the parts bike today.
If No surprises.

$700 is less than $1,500 for just the engine, alone. Plus, with parts bike, I got battery, another set of tires, some plastics, and various cables, carbs, and more! Only 15+ years old. Lol

Looking forward to it!

 

[GPR1500SC]

I’ll have to start a new help thread about motor swap.

We are picking up the parts bike today.
If No surprises.

$700 is less than $1,500 for just the engine, alone. Plus, with parts bike, I got battery, another set of tires, some plastics, and various cables, carbs, and more! Only 15+ years old. Lol

It will also be a good mechanical course for your boy's education.

Education is never cheap