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Dennisg

1989 suzuki lt-250 4wd

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I recently rebuilt the top end of the motor and rebuild of the carb. It was smoking real bad and hard to start. Now it starts right up and shoots out white smoke and oil out of the tailpipe. It also idles fast with no adjustment on the idle screw . What can be my problem?

Thanks

dennisg

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I had the piston replaced and the cylinder fitted to a new one and the head finished by a service shop and

I bought a carb rebuild kit from e-bay and cleaned it and put it all back together.

Vacum? Which hoses would that be?

Thanks Dennisg

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I had the piston replaced and the cylinder fitted to a new one and the head finished by a service shop and

I bought a carb rebuild kit from e-bay and cleaned it and put it all back together.

Vacum? Which hoses would that be?

Thanks Dennisg

check your boots on the carb:yes: check your head pipe connection to the head Check your carb again ! Blowing white smoke ? check your head gasket JMO

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I have checked the head and the pipe and it is tight with no leaks. The carb boots , it seems that it does not make any difference weather the boot is connected or not, just runs fast at idle with no adjustment. I assume that you are talking about the boot that goes to the airbox.

Thanks

dennisg

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I have checked the head and the pipe and it is tight with no leaks. The carb boots , it seems that it does not make any difference weather the boot is connected or not, just runs fast at idle with no adjustment. I assume that you are talking about the boot that goes to the airbox.

Thanks

dennisg

No I was thinkin the one that connecets the carb to the motor If you checked all that stuff then I would go back in to the carb The white smoke is puzzling to me !! Dou have any pics of the quad ?

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Isnt white smoke usually coolant? Dont know if car physics apply here

Sent from my SGH-T959V using Tapatalk

Caused by a blown head gasket most of the time !!

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I thought that I may have overfilled the oil, so I let some out and then ran the engine for a few minutes. Oil and white smoke still shooting out and still idling too fast. Any Ideas?

Thanks

Dennisg

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It is a 4 stroke. It is like it is possessed or something. The carb screws should work and the overhaul should have stopped it from smoking. It is just the same as before all of the work.

People say that it needs and overhaul and the carb needs to be rebuilt, but both of those have been done. All of the hoses and boots are in good condition. It runs too fast and the engine spews out white smoke.

Thanks

Dennisg

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I'm racking my brain here what little I have left. I hope you don't get tired of the question I should do a search on your quad . But here it is. Is it water cooled. How long ago was the rebuild. was it a total motor rebuild.

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It is air cooled. The rebuild was two months ago, that is how long I have been trying to get it running right. The rebuild was just the top end, with new piston and rings and head with the valves reground. Keep the questions coming maybe we can figure something out.

Thanks

Dennisg

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Yes I used the old cylinder, but it was bored .050 over and a new piston was fitted to it. I put it all together and it still smokes like it did before the overhaul.

dennisg

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I went and did an internet search all I found was 1 site saying the head gasket would cause this but it only smoked at idle. White smoke is always been moisture. I give up sorry I'm lost on this one. I hope you find the problem & if you do post it please.

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Do you know if you put the rings on the piston in the right order.For the high idle Double check your throttle cable to see if their is an binding sometimes where it goes into the carb can be a little tricky. Does your throttle work smoothley. Even if your head is tight does not mean the gasket did not get damaged when you put it back togather Did you torque everything to specs and with a head you tighten head bolt alittle at a time lets say the specs say 25ft. pounds torque you would set your torque wrench at 10ft. pounds and tighten each head bolt in a cross pattern or x pattern and continue these steps till your at 25ft. pounds. Did you do it this away?

Edited by hangingon

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I didn't give up yet. My advice on the head is from my auto background. And that is how you install a head on a car. I feel it should be the same for a quad other wise it is easy to damage the gasket.

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I would agree with hangingon I would check the throttle cable, I had the same issue with my 89 quadrunner 250. as for the white smoke part I would check the valve seals.

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