siezed motor 250r

[poohbee1]

I was thinking about going to the badlands tomorrow took my wheeler out this afternoon and was pushing it really hard and seized it up tight. The filter was clean ,running it 32 to 1 927 maxima , jetted a little on the rich side ,running perfect ,no noises. The cylinder is stuck so bad I don't know how im going to get it apart to see how bad it is . any suggestions

[Yamaha_Rules69]

Take the head off and bang the piston down with a block of wood and a mallet. Pull the flywheel cover off and see if there is gas in there (tell tale sign of a really bad crank seal.)

[poohbee1]

thanks ill give that a try

[rg97]

Good thing that you didnt try and keep starting it, or bump start it or anything. There was this guy on bansheehq that TRASHED his engine. i got some of the pics from it.
His piston
http://i1362.photobucket.com/albums/r696/rg97/image2apu_zps92d5fd99.jpg (http://s1362.photobucket.com/user/rg97/media/image2apu_zps92d5fd99.jpg.html)
His crankcase. he had a picture of the cylinder, but he deleted it. It was pretty much all melted :D
http://i1362.photobucket.com/albums/r696/rg97/image1vo_zps5cbe5719.jpg (http://s1362.photobucket.com/user/rg97/media/image1vo_zps5cbe5719.jpg.html)

[christph]

Perhaps it was a cold seize. Did you let it warm up? Cold seizure was more common on the first water cooled 2 strokes. Because the piston warms up and expands more quickly than the cylinder sleeve, if you run it without letting the entire engine warm up it can seize. The tell-tale sign is scoring on four opposing sides of the piston.

[Dirtcrasher]

There was certainly some serous detonation gong on there....

[poohbee1]

it was warmed up .I was going to take it apart but decided to just wait and leave it in until I get a new one. I don't want to have this thing in pieces all over my garage for a month. sad thing is I had a fresh ported cylinder ready to go on it but the bottom end has to be trashed. I was thinking about buying one of those 85 take out motors that come up on ebay all the time but I am kind of worried about a motor that's been sitting on a shelf for so long they usually sell for 1000$ not sure what im going to do yet.

[Dirtcrasher]

No, now they run 2K plus. They are just fine I have run 2 without even a clutch or oil seal failure.

Last 85R motor I saw was 2500.00$ BIN.

[poohbee1]

people ask 2000 $ but they usually sell for around 1000$ http://www.ebay.com/itm/Honda-250R-TRX250R-ATC250R-OEM-TRX-NEW-Bike-take-off-Running-Engine-1985-1989-/251298348003?pt=LH_DefaultDomain_0&hash=item3a828c7be3 asking and selling are 2 very deferent things and if I cant find one I will have one built

[Dirtcrasher]

You can rebuild one but it won't be new. Just as stated in the sellers ad.

If I saw it at 1K, I would have bought it. Just like the discontinued parts, everything is on the rise......

[poohbee1]

175095 im going to dig into this afternoon hope it doesn't look like the one adove

[poohbee1]

175099175100175101 I cant believe this a nut has welded itself to the crank where did that come from:wondering I didn't put it there. the motor is not seized the nut is hitting the case

[Yamaha_Rules69]

WOW, do you think someone may have dropped it in the sparkplug hole or put it in your intake manifold to ruin your day?

[poohbee1]

no ones ever been around it but me . the cylinder has never been taken off, the reeds have never been taken off by me anyway. the spark plug has been in it for 2 years the pipe has a good 6 hours of use on it . the only thing I have done to it in a long time is switch the gas tank from black to red

[Marty]

WOW i thought I have seen it all!!!!!

[poohbee1]

I don't no what to do with it I removed the nut from the tins ,crank is free and the bearings seem tight but the piston smacked the nut so there is little pieces in the bottom end . the cases are not damaged ,the tins are fine . I think im just going to send the bottom end off and have it split to check the crank and bearings and clean it out before putting a good cylinder on it 175107

[82 250r]

I wonder if the nut was in the new pipe?

[Jason Hall]

Did the nut go all the way around while it was welded to the crank?? If it did, you better look at the cases on the bottom. I hope the cases are not broke on the bottom where they seam together with the case gasket. I lost some Tiny little reed a s rews from my 310 a few years ago, and 1 little screw got stuck between the big end of the rod and the case and split the case wide open..

[JasonB]

thats hardcore! never seen that before. I cant tell for sure in the pics, but is that a lock nut style nut? I have no idea where it would have come from.

[poohbee1]

finally got it done this morning its on its second heat cycle177652 that sucked

[Dirtcrasher]

Looking great buddy!!

[JasonB]

damn dude! nice R! Love the pipe, the fenders, and the entire set up! congrats on getting it back together