97 txt intake valves shot and burning oil, replace rings too?

firebird_1995 · 12-25-2009, 01:23 PM

i have a 97 txt with a 295cc engine. i was having some power issues, especially going uphill. i adjusted the valves today and checked compression and im down to 125/100. it was 150/125 just a few weeks ago. i decided to pull the head to check the valves and sure enough the intake valves are so badly worn they are curled up on the ends. my question is this: should i go ahead and re-ring it while im at it? im confident that the low compression was due mostly to the intake valves BUT it has been burning oil also. you can tell that one cylinder (the one that had higher compression, less damaged intake valve, and more oily spark plug) had more oily carbon buildup than the other. im not sure if it could be an oil control ring stuck or just a bad valve stem seal. the cylinder walls look good and mic out to 2.525 (with a dial caliper, i dont have a bore gage). what are your thoughts/ experience on this? thanks a bunch. -chris

mikesmotortoys · 12-25-2009, 01:26 PM

I'd say since the engine is out and apart it couldn't hurt

firebird_1995 · 12-25-2009, 03:49 PM

thats what im leaning towards. since im about .005" over factory bore, and around .009" away from a .25mm oversize, what would you suggest i go with? im not sure what the upper wear limits on the factory bore is, but im sure by the time i hone it i'll well over the limit. do you think i could just use the hone to open the bores up to the +.25mm oversize?

edit: i just got the bore gage out and mic'd the cylinders per the repair manual. i only have .002-.003" difference between the bottom and top of the bore. the manual says to bore it after .004" difference. the engine is still in the cart, i just pulled the head today. i think i might just do a top end rebuild for now, see what the compression comes up too and if the smoke goes away. if that doesnt work i will plan on pulling the engine and going deeper. any thoughts or suggestions?

ruredy · 12-25-2009, 09:19 PM

Quote:

Originally Posted by firebird_1995

any thoughts or suggestions?

Yes, you would be much better off to pull the engine, hone and re-ring it also if it's smoking. don't try and bore it out by honing, it doesn't work that way.

firebird_1995 · 12-25-2009, 10:01 PM

i guess the chances of the oil entering the combustion chamber through the valve stem seals are less than it coming past the rings?

ruredy · 12-26-2009, 07:41 AM

Quote:

Originally Posted by firebird_1995

i guess the chances of the oil entering the combustion chamber through the valve stem seals are less than it coming past the rings?

That has been my experiences with these engines, chances are you'll re-do the head and it'll smoke just like it did before.

COURTESYCART · 12-29-2009, 09:03 AM

remember if you do a full rebuild, there will still be oil in the muffler, so the eng will still smoke for a few trips. I would just do a reman eng. they are easier to fool with, just replace, and it comes with a warranty.

i sold a reman eng to a customer and he brought it back stating that it smoked worse than the orig. i told him about the oil in muffler and he said i was crazy. Ordered him another eng and same thing. Long story short i had to refund his money back on 2 eng and he left with no eng. About 2 weeks later i ordered a muffler for the same cart thru someone else. i remembered the serial number. So i guess he was ashamed that i was correct about the muffler.

firebird_1995 · 01-02-2010, 05:09 PM

when i originally bought this cart the previous owner gave me a new intake and exhaust valve that he had. after i got into the head and found both intakes to be bad i ordered another intake and exhaust valve. the ones that i had in the head, and the ones he gave me were for the 2 piece retainer. the ones i ordered, unfortunatly, are the old style single piece retainer. my question is, will these old style valves work if i get some one-piece retainers or do i need to replace the springs too?

ruredy · 01-03-2010, 08:28 AM

Quote:

Originally Posted by firebird_1995

the ones i ordered, unfortunatly, are the old style single piece retainer. my question is, will these old style valves work if i get some one-piece retainers or do i need to replace the springs too?

I wouldn't down grade my engine just cause of 2 valves, the newer type is better. I'm surprised to even hear this question, I didn't think they made the old style anymore. I know you need to change all of it if going from old to new, I can only assume you need to do the same going the other way,

firebird_1995 · 01-03-2010, 08:59 AM

ok. i wasnt aware it was a "down grade". i'll try to return them and get the right valves. thanks

12-25-2009, 01:23 PM	#1
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5	97 txt intake valves shot and burning oil, replace rings too? i have a 97 txt with a 295cc engine. i was having some power issues, especially going uphill. i adjusted the valves today and checked compression and im down to 125/100. it was 150/125 just a few weeks ago. i decided to pull the head to check the valves and sure enough the intake valves are so badly worn they are curled up on the ends. my question is this: should i go ahead and re-ring it while im at it? im confident that the low compression was due mostly to the intake valves BUT it has been burning oil also. you can tell that one cylinder (the one that had higher compression, less damaged intake valve, and more oily spark plug) had more oily carbon buildup than the other. im not sure if it could be an oil control ring stuck or just a bad valve stem seal. the cylinder walls look good and mic out to 2.525 (with a dial caliper, i dont have a bore gage). what are your thoughts/ experience on this? thanks a bunch. -chris
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5

12-25-2009, 01:26 PM	#2
mikesmotortoys Gone Wild Join Date: Mar 2008 Location: Rockwall, Texas (Dallas / Ft. Worth) Posts: 7,077	Re: 97 txt intake valves shot and burning oil, replace rings too? I'd say since the engine is out and apart it couldn't hurt
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12-25-2009, 03:49 PM	#3
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5	Re: 97 txt intake valves shot and burning oil, replace rings too? thats what im leaning towards. since im about .005" over factory bore, and around .009" away from a .25mm oversize, what would you suggest i go with? im not sure what the upper wear limits on the factory bore is, but im sure by the time i hone it i'll well over the limit. do you think i could just use the hone to open the bores up to the +.25mm oversize? edit: i just got the bore gage out and mic'd the cylinders per the repair manual. i only have .002-.003" difference between the bottom and top of the bore. the manual says to bore it after .004" difference. the engine is still in the cart, i just pulled the head today. i think i might just do a top end rebuild for now, see what the compression comes up too and if the smoke goes away. if that doesnt work i will plan on pulling the engine and going deeper. any thoughts or suggestions?
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5

12-25-2009, 10:01 PM	#5
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5	Re: 97 txt intake valves shot and burning oil, replace rings too? i guess the chances of the oil entering the combustion chamber through the valve stem seals are less than it coming past the rings?
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5

12-29-2009, 09:03 AM	#7
COURTESYCART Gone Wild Join Date: Nov 2008 Location: Montgomery, AL Posts: 1,463	Re: 97 txt intake valves shot and burning oil, replace rings too? remember if you do a full rebuild, there will still be oil in the muffler, so the eng will still smoke for a few trips. I would just do a reman eng. they are easier to fool with, just replace, and it comes with a warranty. i sold a reman eng to a customer and he brought it back stating that it smoked worse than the orig. i told him about the oil in muffler and he said i was crazy. Ordered him another eng and same thing. Long story short i had to refund his money back on 2 eng and he left with no eng. About 2 weeks later i ordered a muffler for the same cart thru someone else. i remembered the serial number. So i guess he was ashamed that i was correct about the muffler.

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01-02-2010, 05:09 PM	#8
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5	Re: 97 txt intake valves shot and burning oil, replace rings too? when i originally bought this cart the previous owner gave me a new intake and exhaust valve that he had. after i got into the head and found both intakes to be bad i ordered another intake and exhaust valve. the ones that i had in the head, and the ones he gave me were for the 2 piece retainer. the ones i ordered, unfortunatly, are the old style single piece retainer. my question is, will these old style valves work if i get some one-piece retainers or do i need to replace the springs too?
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5

01-03-2010, 08:59 AM	#10
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5	Re: 97 txt intake valves shot and burning oil, replace rings too? ok. i wasnt aware it was a "down grade". i'll try to return them and get the right valves. thanks
firebird_1995 Not Yet Wild Join Date: Dec 2009 Posts: 5

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