Question about 2000 Yamaha DT 125 R

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Rebuilt my dt125 engine and now there is water ontop of my piston, anyone know why

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Head gasket is faulty or not tight enough .

Posted on Jul 15, 2010

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I have a 1987 kx 125 just put topend gasket set in with piston and rings and coolent is getting in the case bottom end anyone know why plz help me

It sounds as if you have rebuilt the engine without torqueing the head bolts. Although, it could be that the cylinder base gasket has been torn during the rebuild. Try to re-tighten the head bolts to the correct settings first. Good luck.

May 23, 2012 | 2003 kawasaki KX 125

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80 hp steaming from engine exhaust wont plaine out carbs just rebuilt

Sounds like the water pump impeller needs changed. How is the stream of water coming out of the weep hole? It should be a good strong flow and only warm not hot. Ther could be debris logged in the intake at the bottom of your motor so check and make sure it is clean and clear. Be very careful of using the motor till this is remidied or you will ruin the power head on the motor. Try flushing the motor out withy a garden hose and intake boot that you cover the intake with and it hooks to the hose, use lots of clean water and watch the discharge fromt he weep hole. Hopefully you just had dirt or mud in the intake and you can flush it out, if not then replace the water pump impeller, I use the 5 blade type vs the 3 blade type for better water flow.
If the engine senses an overheat condition it will not run at full power, this is a safety to keep the motor from failing. You may also have a burned piston which would cause a low power condition. The carbs were rebuilt but are they running too lean? if so this would cause the motor to overheat as well. Take the plugs out and look inside the cylinders with a flash light to see if you have a damaged piston that could be causing the overheating condition. If your using the oild injected motor, you could have a plugged oil line and that will cause damage to a piston as well. It won't hurt to run the motor rich on the oil, so if you wish you can even add oil to the exsisting gas to make sure your getting oil to all pistons. I have seen this in the past when one cylinder was not getting oil but there was enough going to the other pistons that never allowed the oil warning light to come on. When you get rid of the oil injection these problems go away. Let me know what you find and how your motor is set up so I can help get this diagnosed. Thanks

Jul 02, 2011 | Yamaha Boating

1 Answer

My dt125 01 plate has blown a ring on 2 pistons in the same place, the remains of the ring goes out the exhaust but it hit the power valve on the way out scoring the piston, the crank area is now making a...

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Yamaha DT 125 2000

Apr 16, 2011 | 2001 Yamaha DT 125 R

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I have a 2004 Gallardo (24,000) and one of the pistons has just gone and the one next to it is scored and has no compression. The rest of the engine appears ok, I live in south of England. Does anyone know...

Your engine would need to be disassembled and inspected to first make sure that your engine block is viable to be rebuilt and second to discern the actual damage that occured and to try and figure out what caused this in the first place to hopefully stop it from reoccuring in the future. If you have a cylider that has lost compression it is usually one of these things: a crack in the cylinder wall, a blown piston (usually the head) or the piston rings have blown out. I would suggest checking the cylinder walls to assess the damage ( they can be honed if they are not gouged) also check your main and connecting rod bearings (specifically if they are seized or show signs of excessive wear as this will tell that you may have a problem with oil circulating through your engine and that could have caused your engine failure. As to the cost it will be expensive as to a referral contact the manufacturer directly for there input to that matter. good luck

Mar 30, 2011 | 2004 Lamborghini Gallardo

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I sank my 91 toyota 4runner and have a knocking in the engine.

If by "sank" you mean submerged in water while the engine was running you probably bent a conecting rod or broke a piston. Water does not compress and if the engine ingested water you have done some major internal damage. No quick fix for this, the engine has to be rebuilt.

Jan 18, 2011 | Toyota 4Runner Cars & Trucks

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2000 Jeep Wrangler has the pistol broken according to a mechanic estimate. Car is shaking very much. I like to know how to repair this issue. Thanks

Pistol? No such animal in an engine. If you mean piston I can't see how they could tell you that without tearing the engine down. If a piston has broken usually it will damage a cylinder wall. Unless the engine is completely torn down and the cylinders are re-machined and fitted with new oversize ones, no repair is going to work.(not correctly)
If you have a bad set of rings or a bad wrist-pin, that can be done but generally that is still expensive.
Likely your best solution would be a good scrapyard engine or a rebuilt one.
Before going further though you should get a second opinion from another good shop. Since being online prevents anyone from looking at or doing the appropriate tests, that is something you need to have done.

Oct 14, 2010 | 2000 Jeep Wrangler

1 Answer

Hi . fully rebuilt over heating 2005 dt125 engine

it wouldn't be the thermostat unless you have it installed backwards. you can gain a **** load more power by putting in a performance camshaft and a full pipe.

Apr 12, 2010 | 2005 Yamaha DT 125 X

1 Answer

2005 CRF250R motor rebuilt but smokes blue

You know what they always say about the color of smoke... blue is oil, white is water and black is  i don't know lol.   Anyhow, if it was just recently rebuilt and you're getting blue smoke then oil is making it into your pistons OR you are burning off oil somewhere when it gets hot.  If you are seeing the smoke from the exhaust only, then think about piston rings, head gaskets, all the typical stuff that gets replaced on a rebuild.  It's near impossible to say exactly where to look so that's the best I can tell you.  I would lean more toward the piston rings.
Good Luck

Jun 10, 2009 | 2005 Honda CRF 250 R

2 Answers

2004 Dodge Ram Srt 10 problem

What is the sending unit on the bottom left (as you face the motor) that goes into the flywheel case? 1189ae2d-36c6-4103-99bf-4de462260711.jpg

Sep 23, 2008 | 2005 Dodge Ram Srt 10 Pickup

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