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General Category >> Rubber Side Down! >> Even worth trying to fix?
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Message started by HillSavage on 07/23/17 at 18:45:21

Title: Even worth trying to fix?
Post by HillSavage on 07/23/17 at 18:45:21

Hey all,
Finally got into my motor, things do not look good. As you can see the melted valve on the piston. Any advice here? I don't have much money and the motors that I am seeing are like 6-800 bucks. Obi Wan Kenobi, you're my only hope. Any thoughts?

Title: Re: Even worth trying to fix?
Post by justin_o_guy2 on 07/23/17 at 18:59:03

Cylinder and head condition is what you need to consider.
And Why did it do that?

You might be able to buy a whole top end, head, jug, piston.

Title: Re: Even worth trying to fix?
Post by Gary_in_NJ on 07/23/17 at 19:09:08

Looks like a new top end for this engine. Dave has a head for sale in the marketplace. From there you'll need a new cylinder and piston kit. A big bore kit would be the way to go because it is less expensive then an OEM kit.

A used replacement engine is probably less of an initial investment, but you don't know what problems you are buying until things start to go wrong.

Title: Re: Even worth trying to fix?
Post by justin_o_guy2 on 07/23/17 at 19:20:22

The budget may make the call.

Year model can be a problem.
Not insurmountable, but not having to swap parts to get it to spark is nice.

Title: Re: Even worth trying to fix?
Post by LANCER on 07/24/17 at 02:03:16

Get some good clear photos of the head, both the chamber and the cam bearing surfaces.
Your piston is toast but I might like to take a look at it.
Check your cylinder closely after you have wiped it out really well and do it out in the sun light...you get a much better look that way.

How many miles were on the engine ?
Did your cam chain crap out on you ?

I believe I have all the parts you need, not new but good used ones if you want to save a LOT of money.

PM me and we can talk about reviving your engine.

Title: Re: Even worth trying to fix?
Post by Savageman on 07/26/17 at 12:16:58

In the picture is the piston all the way to TDC on it's stroke. If it is your rod is also bent therefore you would need a bottom end also.

See if the piston goes all the way up to top of bore. :o

Title: Re: Even worth trying to fix?
Post by Ruttly on 07/26/17 at 12:33:01

Can you say: LEAN

Or: 10,000 rpms in 7,000 rpm engine then missed a shift

Or: BOTH

:(

Title: Re: Even worth trying to fix?
Post by Ruttly on 07/26/17 at 12:36:09

Check warranty and/or bank balance !

Read that in a trouble shooting section in a old BSA manual.

Title: Re: Even worth trying to fix?
Post by justin_o_guy2 on 07/26/17 at 12:40:12

Get the crap off the piston before you move it.
Don't despair. A calm assessment of the situation is in order.

Title: Re: Even worth trying to fix?
Post by Savageman on 07/26/17 at 12:53:48

Post some better pictures of the cylinder and head. I want to see the top of the piston after you chisel all that scrap metal off. Did it run out of oil and swallow the valves?

Title: Re: Even worth trying to fix?
Post by Fast 650 on 09/04/17 at 10:33:30

4B6D62666D466968650C0 wrote:

That looks almost as bad as what I am dealing with. P.O. got carried away with gasket goo and blocked all oil to the top end. But I found an engine from a low mileage wreck with a busted case. Low enough miles to have only had its first oil change before the accident. Swapped the cases and when finished I will have an essentially new engine.