350x seized engine diagnostics

[dman10]

Im really interested in what you find wrong in this thing.

I am too lol.
I've got the motor completely unhooked minus 3 of the motor mounts. Waiting for a second set of hands to pull it out. Those suckers are heavy.

[6spdls1z28]

I am too lol.
I've got the motor completely unhooked minus 3 of the motor mounts. Waiting for a second set of hands to pull it out. Those suckers are heavy.

They are very. Reminds me of picking up a bare iron block v8 haha.

[dman10]

Finally got it tore down, as suspected, piston was stuck, full of rust, not surprised with the mystery fluid in the exhaust pipe and the surface rust in the shifter side cover.

But also found all the cool markings on the motor:




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[yaegerb]

what in the hell happened to that sleeve. You better call John Tice.

[dman10]

what in the hell happened to that sleeve. You better call John Tice.

Our good friend H2O lol.
Guess I'm gonna need his info lol


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[3 Wheel Drive]

Im dealing with a similar problem but on a smaller scale:

http://www.3wheelerworld.com/showthr...My-first-Honda!

My odometer shows around 1200 miles, and was last tabbed in 1990. The valves were both closed but there was a lot of crap in the cylinder from a rusted out exhaust.

[barnett468]

Did you get the cylinder off yet?


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[3 Wheel Drive]

Kroil is the #1 rusty nut buster for the oilfield worker in louisiana. With that being said, this advice sounds like a page out of the mechanical engineers bible. Barnett 3:68 "Thou shalt use only Kroil oil" (even as cologne) I'm glad it worked out for you Mil.

Tell them Barn.... Preach the good word!

[dman10]

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[dman10]

We also have a couple blued spots on the crank, everything seems smooth and tight though.
I'd take a picture, but I couldn't get a good one in that bad barn lighting.


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[yaegerb]

If you are correct, and it did in fact hydro lock, there is no way the rod bearings are still good IMO. For s and g's grab he rod and pull up and down against the big end bearing. Should be zero up/down play. For a piece of mind I would get the crank rebuilt and get a new sleeve.

[dman10]

I'd love to rebuild it, but I don't have the place or knowledge to split the case.
Here's the piston:



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[barnett468]

Unless I missed something, imo there is nothing that suggests it needs a new sleeve unless it is pitted too deep to clean up at 1 mm over . I would first remove the rust to get a better idea of just how bad the cylinder is pitted and then go from there . If it is beyond repair, you can get a used cylinder and bore that if it is much more cost effective than getting a new sleeve installed and you are on a budget.

Here's a standard bore one for only $52.00 with the promotional discount plus free shipping and a 30 day return policy if you don't like it.

http://www.ebay.com/itm/HONDA-350X-A...dYqlc1&vxp=mtr

Here's one here for $80.00 plus shipping that looks like it should clean up with a bore with a 30 day return policy.

http://www.ebay.com/itm/86-Honda-ATC...-/321160008894

Here's several more.

http://www.ebay.com/sch/i.html?_from...inder&_sacat=0


If you want to go to a big bore kit you could call TC Racing and ask them what is available as well.

http://www.tcracingengines.com/




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[dman10]

I've actually got a 85' parts motor, with a cylinder and piston I think that'll work, need to pull it out.


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[yaegerb]

Unless I missed something, imo there is nothing that suggests it needs a new sleeve unless it is pitted too deep to clean up at 1 mm over . I would first remove the rust to get a better idea of just how bad the cylinder is pitted and then go from there . If it is beyond repair, you can get a used cylinder and bore that if it is much more cost effective than getting a new sleeve installed and you are on a budget.

Here's a standard bore one for only $52.00 with the promotional discount plus free shipping and a 30 day return policy if you don't like it.

http://www.ebay.com/itm/HONDA-350X-A...dYqlc1&vxp=mtr

Here's one here for $80.00 plus shipping that looks like it should clean up with a bore with a 30 day return policy.

http://www.ebay.com/itm/86-Honda-ATC...-/321160008894

Here's several more.

http://www.ebay.com/sch/i.html?_from...inder&_sacat=0


If you want to go to a big bore kit you could call TC Racing and ask them what is available as well.

http://www.tcracingengines.com/




PREVIOUS KAWASAKI INTERNATIONAL R & D PROJECT ENGINEER AND ATV DEPARTMENT SUPERVISOR

You must not be looking at the same pictures I am. The sleeve is actually mushroomed in four corners unless its an optical illusion. That is toast.