1989 marathon project...

SkysTheLimit · 08-31-2015, 05:03 PM

Quote:

Originally Posted by TomStark

That cracked piston is not your problem. Don't get me wrong, it is junk and needs to be replaced, but look at the scoring on that piston. Were the rings real tight in that area, and maybe took some effort to get out of the grooves? It looks like there was not enough oil in the fuel. Of course, it could also be that there was plenty of oil, but your leaking crank seals allowed air in making the engine lean. Also, all the crud that was around the fan can't help engine cooling, and air cooled engines tend to run hot anyway. 400+ degrees is not unheard of in an air cooled engine.
Tom

Rings seemed fine it wasn't until I cleaned up that I noticed the piston crack... Basically all my focus is getting flywheel off and fan and then clutch. Cylinder wall has a burr.

SkysTheLimit · 08-31-2015, 05:05 PM

Currently hung up on fan removal

SkysTheLimit · 08-31-2015, 06:37 PM

Fan off time to pull flywheel and clutch

TomStark · 09-01-2015, 12:52 AM

Really thought the rings would be binding. Anyway, are you using the oil injector pump? Seems a lot of people don't trust them, and prefer to mix oil with the gas. It would seem to me that would be the best choice for a consistent mixture. I would also run a little fat on the oil. A friend built a cart, and set the engine to 0 deck, giving it more squeeze, and he was running 60:1 oil to fuel. that is about double what is suggested for stock. He never had an issue with fouling plugs or anything else. I would rather err on the fat side than thin. Also, make sure your seals are good. I toasted a snowmobile motor that way once. Ran real well for a few seconds, then, not at all!
tom

SkysTheLimit · 09-01-2015, 10:45 AM

I plan on premixing to just simplify it. trying to dig up threads on the flywheel pull.

SkysTheLimit · 09-01-2015, 06:12 PM

Took a break and jumped on rust and grime....

SkysTheLimit · 09-20-2015, 07:35 PM

update: case is split, new bearings, carb rebuild and crank seals were toast. clutch side dry rotted and flywheel side leaking. new cylinder,piston,rings the works. .....

That80sGuy · 11-05-2015, 01:27 PM

Gonna follow this thread..I just picked up the same cart.

racin161 · 11-05-2015, 09:37 PM

You did check the ring end gap RIGHT??? Just saying !! I've had to file fit all 3 of my engines when the parts arrived. Port in piston facing the carb not EXH.

LOU

SkysTheLimit · 12-27-2015, 08:12 PM

finally back on the project. motor is back to brand new and painted. cylinder,piston,rings,crank seals,bearings,gaskets... dropped back in cart after painting the chassis... tackling electrical at this point. painted all exhaust parts high temp black to match everything in engine are and parts. Gas tank is also black..

08-31-2015, 05:05 PM	#12
SkysTheLimit Not Yet Wild Join Date: Aug 2015 Location: CT Posts: 46	Re: 1989 marathon project... Currently hung up on fan removal

08-31-2015, 06:37 PM	#13
SkysTheLimit Not Yet Wild Join Date: Aug 2015 Location: CT Posts: 46	Re: 1989 marathon project... Fan off time to pull flywheel and clutch

09-01-2015, 12:52 AM	#14
TomStark Gone Wild Join Date: Jul 2015 Location: Metro Detroit Posts: 449	Re: 1989 marathon project... Really thought the rings would be binding. Anyway, are you using the oil injector pump? Seems a lot of people don't trust them, and prefer to mix oil with the gas. It would seem to me that would be the best choice for a consistent mixture. I would also run a little fat on the oil. A friend built a cart, and set the engine to 0 deck, giving it more squeeze, and he was running 60:1 oil to fuel. that is about double what is suggested for stock. He never had an issue with fouling plugs or anything else. I would rather err on the fat side than thin. Also, make sure your seals are good. I toasted a snowmobile motor that way once. Ran real well for a few seconds, then, not at all! tom

09-01-2015, 10:45 AM	#15
SkysTheLimit Not Yet Wild Join Date: Aug 2015 Location: CT Posts: 46	Re: 1989 marathon project... I plan on premixing to just simplify it. trying to dig up threads on the flywheel pull.

09-20-2015, 07:35 PM	#17
SkysTheLimit Not Yet Wild Join Date: Aug 2015 Location: CT Posts: 46	Re: 1989 marathon project... update: case is split, new bearings, carb rebuild and crank seals were toast. clutch side dry rotted and flywheel side leaking. new cylinder,piston,rings the works. .....

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11-05-2015, 01:27 PM	#18
That80sGuy Not Yet Wild Join Date: Nov 2015 Location: Augusta, GA Posts: 73	Re: 1989 marathon project... Gonna follow this thread..I just picked up the same cart.

11-05-2015, 09:37 PM	#19
racin161 Gone Wild Join Date: Feb 2011 Posts: 1,515	Re: 1989 marathon project... You did check the ring end gap RIGHT??? Just saying !! I've had to file fit all 3 of my engines when the parts arrived. Port in piston facing the carb not EXH. LOU
racin161 Gone Wild Join Date: Feb 2011 Posts: 1,515

12-27-2015, 08:12 PM	#20
SkysTheLimit Not Yet Wild Join Date: Aug 2015 Location: CT Posts: 46	Re: 1989 marathon project... finally back on the project. motor is back to brand new and painted. cylinder,piston,rings,crank seals,bearings,gaskets... dropped back in cart after painting the chassis... tackling electrical at this point. painted all exhaust parts high temp black to match everything in engine are and parts. Gas tank is also black..

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