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Tech Information => General Help => Topic started by: Lloyd (ljm) on March 08, 2013, 05:49:55 PM

Title: Hole in PTO piston
Post by: Lloyd (ljm) on March 08, 2013, 05:49:55 PM

 

 This is the engine that is in my Sportfire. It is the engine that was originally in my 80 440 Drifter.

 I sealed it all up. passd pressure test. Put it in sled, Drove about 1 mile and burned a hole in the piston.

 Any ideas why it burned?

Title: Re: Hole in PTO piston
Post by: mswyka on March 09, 2013, 06:55:39 AM

Ouch!  Did it run really, really, nice right up until the point where it quit?

I have seen that piston a few times on our 440 Invader and always just after it seems to fly like a jet.  And, each time we found an air leak on the inlet that allowed the engine to run lean.

Title: Re: Hole in PTO piston
Post by: kawhead on March 09, 2013, 08:46:46 AM

i say lean also.....what carb are you running?

Title: Re: Hole in PTO piston
Post by: gixxer6 on March 09, 2013, 08:49:50 AM

Looks like it ran lean.  A lean condition is one of two things, too much air, or not enough fuel.  You did a pressure test, I would look at your fuel supply.  A plugged jet maybe?  Or a pinched fuel line? 

Title: Re: Hole in PTO piston
Post by: Lloyd (ljm) on March 09, 2013, 06:05:46 PM

Actually Mark it ran like crap before it burned.

 I know usually they never run better than just before they pop.

 Would you believe after it burned I still drove the sled home.(about 1500 feet)

Lloyd

Title: Re: Hole in PTO piston
Post by: mswyka on March 10, 2013, 02:36:07 PM

Glad you made it home.  I always had to get towed.  Very embarrassing.

Title: Re: Hole in PTO piston
Post by: Lloyd (ljm) on March 10, 2013, 04:29:20 PM

Back together and running much better today. Short run on probably our last sledding day