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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 17 Jan 2007
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very interesting gavin, i will try this test this weekend as my engine is already dismantled! where can i get those rings you mentioned?
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  #2  
Old 17 Jan 2007
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deves rings....
www.deves.com

I order them from a local agent.

Gavin
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  #3  
Old 22 Jan 2007
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Aussie dan: Have you ever bothered to measure the diameter of the bore properly ?

High milers or over zelous honing can take too much off the bore and original sized rings just wont have the spring in them to cope. Oversized rings will be necessary and available from Yamaha. Manually prizing open rings is a bad bodge and they will only close up again or cause even wear.

If oversized rings dont help (measure the bore first before fitting) then you may need a new bore fitted into the barrel.

A pool of oil on the piston means either your rings are leaking, valve seals are mush or cylinder head gasket is toast or not sealing properly.

You might want to get your hands on a cylinder leakage tester too.
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Old 25 Jan 2007
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[quote=tedmagnum]Aussie dan: Have you ever bothered to measure the diameter of the bore properly ?
quote]
Gday Ted.
No, i haven't measured the bore up yet.
I bought the bike brand new in 2003 and its only done 15000kms, so i wouldn't consider it high mileage yet. I do suspect the rings have issues though (even though a compression test came up fine) because even after an oil change, the new oil becomes filthy from what looks to be carbon very quickly...
I got it out of the shed and started it last weekend after it had been sitting unused for nearly 3 months and to my surprise, it only blew a tiny amount of smoke when i gave the throttle a quick twist.
I'm going to put plain mineral oil in it and run it around for a few weeks to see if it makes any difference. If nothing changes and it continues to blow smoke, i will take the engine apart and get the barrel honed (hopefully it wont need to be bored to the first oversize) and replace the rings.
Wish me luck!
Cheers, Dan.
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  #5  
Old 25 Jan 2007
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2003 ! Whats the mileage ?

If a compression test is good then the rings will more than likely be fine.

You could try doing a compression test after letting the bike sit, and then drop a spoon of oil into the bore and then try.

If the rings arnt sealing properly, the second test will give a higher figure.
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  #6  
Old 25 Jan 2007
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Quote:
Originally Posted by tedmagnum
2003 ! Whats the mileage ?

If a compression test is good then the rings will more than likely be fine.

You could try doing a compression test after letting the bike sit, and then drop a spoon of oil into the bore and then try.

If the rings arnt sealing properly, the second test will give a higher figure.
You sound surprised Ted!! Yes it's a 2002 model (I bought it brand new in the beginning of 2003) and its only done 15000km which equates to less than 9500 miles......
Might have to try the oil in the bore compression test like you have said.
The filthy oil does tend to make me think the rings are knackered though, or perhaps that the semi-synth oil that the bike has been running since new has stopped the bore and rings from wearing in properly....
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  #7  
Old 29 Jan 2007
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Smoking XT
Dan

When I checked compression on my newly assembled "smoker" it checked out fine. Thats because the problem was with the oil ring which contributes nothing to compression. I would carefully measure the bore and piston bore clearances for all dimensional specs and do the Mike test on the oil ring. Also measure all rings before installing them. Just because they come out of a sealed box doesnt mean they are right! I have had a number of thumper motors use oil after a rebuild (altho they didnt smoke at startup or otherwise). They just needed a good run to get the rings to bed in even after having covered a few thousand KM's. The assembly procedure that I now use is to assemble the barrell, pistons and rings starting with all components dry and oil free. I wash the bore with hot soapy water first. I put about five drops of oil on my hands and assemble the rings on the piston, piston onto rod and finally stick the barrell on. No lashings of oil. When its all buttoned up I start the motor put on my lid and immediatly leave for a short ride. Come back and check for oil leaks etc. My moneys on a bad set of oil rings! ;>) I'll revisit my smoking XT once I finish my latest project which will have me worried if it doesnt smoke everytime at startup....a two stroke Suzuki GT750.

Gavin
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