10 replies to this topic

[PennsylvaniaNewt]

I just picked up the engine today from the machine shop! Don't ask how much it cost I also thought I would post some pictures of the old piston. What could have caused the REALLY heavy scoring above the rings?

The engine was punched out 10 over new exhaust valve guide and also new rod bearings etc. I hope it will be worth it I wouldn't have invested this kind of money but as you can see my machine is in pretty good shape :smile1:

Attached Thumbnails

• 
• 
• 

[PennsylvaniaNewt]

I also forgot to ask.....I want to replace the points and condensor while I have it out. Where is a good place to buy them? How do you time this engine etc. when replacing them?

[Bolens 1000]

Glad to hear you got the engine back

You can check out our site sponsors and see if they have the points or you could try ebay.

Where is the scoring your talking about :confuse:

[Bolens 1000]

Page 12 of this manual goes over how to time the engine
http://gardentractor...ine-manual-179/

[PennsylvaniaNewt]

Right above the rings there are real deep scores at the top edge of the piston (I know the picture is blury)

[OldBuzzard]

Looks like some foreign object was in there. Maybe a screw from the carb?

As for points and condenser, give NAPA a try. I got a set for my 800 from them.

[Bolens 1000]

Right above the rings there are real deep scores at the top edge of the piston (I know the picture is blury)

I agree with oldbuzzard, The only thing I can think of is something got in there

[Bolens 1000]

Looks like some foreign object was in there. Maybe a screw from the carb?

As for points and condenser, give NAPA a try. I got a set for my 800 from them.

What is the napa part number . My local napa couldnt match my points up

[Bruce Dorsi]

The part number for the points & condenser (ignition kit) for the S-12D was Wisconsin # YQ-16.

For the S-8D, TR-1oD, & TRA-10D engines, the ignition kit was Wisconsin part # YQ-12. .....Points were Wico #X14508, Condenser was Wico #X14590.

For the S-7D engine, the ignition kit was Wisconsin part # YQ-11. .....Points were Wico #X14031, Condenser was Wico #X12984.

The heavy scoring around the top of the piston is not abnormal. ....I have seen that at numerous small-engines with lots of hours. .....I believe it may be caused by overheating, corrosion from the exhaust gases, and scoring caused by chunks of hard carbon.

[Bolens 1000]

I gave my NAPA guy the YQ12 number and he couldn't find anything. :confuse:


I did not give the wico number, so I will have to try that next time I go

[OldBuzzard]

What is the napa part number . My local napa couldnt match my points up

I don't remember. I do know that I had to go back a 2nd time as they gave me the wrong points the first time.

I went back to those posts, and i didn't post the NAPA PN.

Maybe if you get a different guy at NAPA who's willing to take a closer look, he can find it. I know it took a lot more searching when I went back the 2nd time, but they DID come up with the right ones.