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24 Jun 2012
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Join Date: Feb 2012
Location: South Africa,Gauteng
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Quote:
Originally Posted by Mezo
Whilst you have the barrel off take a peek down inside at the gears for any chipped teeth, at that mileage id say your going to see some? unless its already been done?
And pop out your valves & check the seats & faces of the valves as well, may need to get them re cut.
Mezo.
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Mezo....now you are starting to give me the creeps about rebuilding my bike's engine. I'm scared I start finding other little problems while at it and then won't be able to fix it because of low cash flow or no part availability.
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25 Jun 2012
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R.I.P. 25 November 2021
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Parts are not the problem, cash can be.
Its common for the 5th gear to be chipped, sometimes others.
You will normally get away with big end bearing & stuff like that but whilst the motor is in bit you may as well fix the knackered parts.
Nine times out of ten it just needs a new piston/rings & often replace the 5th gear, then there's tens of thousands of happy riding kilometers afterwards.
Yamaha made a pretty reliable pushbike in the XT600, look after it & it will reward you with many years of riding.
Mezo.
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25 Jun 2012
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Thanks Mezo,
I'll check that fifth gear - it does make a funny whining noise when the bike is running in that gear....
Just as a matter curiosity - Can I just replace rings without doing anything about the cylinder bore? Purely asking as I think that just engineering the cylinder will cost me quite a few bucks.
What is the standard size for the rings, because I don't completely understand the Clymer manual's measurements (Something like 94.00-97.00,95.00 - can't remember exactly). If the diameter of the cylinder is standard what size rings should I be looking for?
I really just want to sort out the high oil usage issue and replace the gaskets.
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25 Jun 2012
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R.I.P. 25 November 2021
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Join Date: Feb 2010
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Yes if its not to worn you can just hone the barrel with a honing brush & fit new rings.
Mezo.
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25 Jun 2012
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R.I.P. 25 November 2021
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Join Date: Feb 2010
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And im guessing your next question will be can i fit new rings without honing?
No, your barrel will have a glaze on there & fitting new rings will need a hone to allow the rings to bed in to the freshly de-glazed/honed barrel.
You cannot simply put new rings in, your initial problem will still be there (smoke trail for miles pissing every motorist off behind you)
Mezo.
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25 Jun 2012
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I figured that you would need to let the new rings create their own grooves/seating within the cylinder, so I knew that honing would be needed and obviously the engine would need to be run in again once the job is done.
Just trying to see how I can resolve the issue with minimal cost - I do however know you can't always get away from spending money if you want it done properly.
Also trying to make sure I don't F*** anything up in the process. Need to learn as much as I can before attempting this task.
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