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Old 09-18-2013, 09:24 AM   #3541
SkidMarx
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Quote:
Originally Posted by sjc56 View Post
From here http://www.yamaha-motor.com/assets/s...-13-18_111.pdf
I see the 1.7 figure is for a rebuilt.
I can see there you would get 1.7.
"Total Amount" is very misleading.
Thanks for the link BTW. I lost that manual 20 years ago.

I looked through some of you're earlier posts. Going by the condition/milage of that bike. I would be VERY surprised if you had any real issues.

The fact that it starts easily, and has new boots tells me that the PO (or mechanic) likely already adjusted the Pilot screw and generally knew what they were doing.

In response to your post regarding the noise from the top end, it's likely normal valve clatter. Mine had a lot of top end noise when it was new. I wouldn't worry about that either.
It doesn't have enough miles to have a stretched timing chain, and the Auto cam chain tensioner should also be fine for the same reason.
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Old 09-18-2013, 11:02 AM   #3542
Jaunty
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Hot?

Hello and thanks for having me.

This thread is huge!

Just acquired an 89 xt350. It did not run, but after a carb cleaning she fired right up and is LOUD! The cylinder starting smoking, so im wondering if its getting too hot. I used a infrared temp sensor on the outside and noticed it got up to 350'ish. Does anyone know if thats too hot? Im worried about riding it, but im also hoping its just dirt or oil built up on the outside thats burning off.

i ordered some intake boots because mine were obviously torn. is it possible that a leak at these boots could cause overheating like this or is there likely another issue (oil pump?)

Should i be worried about the cam chain tensioner at this time?
The cylinder area is quite noisy. rattling and such. It does not smoke at all out the tailpipe though.

Is it difficult to remove the valve cover and check the valve clearance? i noticed some gasket material there as if it were done recently.

advice appreciated.
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Old 09-18-2013, 12:39 PM   #3543
SkidMarx
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Quote:
Originally Posted by Jaunty View Post
i ordered some intake boots because mine were obviously torn. is it possible that a leak at these boots could cause overheating like this
Yes. Absolutely. do not run the bike with bad boots.
Quote:
Originally Posted by Jaunty View Post
Should i be worried about the cam chain tensioner at this time?
Not likely. I few people have had issues but it's still pretty rare. If the chain is loose, it's more likely that the chain guides are so warn out that the tensioner has run out of adjustment.
Pull the valve cover and check the chain tension. It should be very tight. if it is, you're good.

Quote:
Originally Posted by Jaunty View Post
The cylinder area is quite noisy. rattling and such.
This is normal to an extent. They have a noisy top ends. Lots of valve clatter at idle. it should go away once you rev it up a bit.
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It does not smoke at all out the tailpipe though.
Good
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Originally Posted by Jaunty View Post
Is it difficult to remove the valve cover and check the valve clearance? i noticed some gasket material there as if it were done recently.
.
Not really. The gasket is rubber and is reusable.
Checking is pretty easy. adjusting them...not so much.

How many miles are on the bike?
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Old 09-18-2013, 03:37 PM   #3544
Jaunty
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thanks for the response...

it has 7900 miles.. i havent ridden it so i dont know for sure if that works. the tach does not work, but im assuming the odo is still functional.

I have the clymer manual so i will be going through all the basics. Stoked!
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Old 09-18-2013, 08:16 PM   #3545
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Congratulations Jaunty! Torn intake boots will cause it to run lean and hot if it will run at all. Yes you should worry about the tensioner and the chain itself. The chains stretch and the tensioner maxes out and the chain will rattle badly and eventually skip teeth. I had to replace mine at 7000 miles.
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Old 09-19-2013, 08:04 AM   #3546
SkidMarx
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Originally Posted by oceansfiftyseven View Post
Congratulations Jaunty! Torn intake boots will cause it to run lean and hot if it will run at all. Yes you should worry about the tensioner and the chain itself. The chains stretch and the tensioner maxes out and the chain will rattle badly and eventually skip teeth. I had to replace mine at 7000 miles.
Wow, that sucks. Never heard of anyone having one go that early before. That would have been warranty work on my bike(a long time ago).

I have close to 30k miles with no issues with the chain or adjuster. I have replaced the guides though.
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Old 09-19-2013, 08:28 AM   #3547
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If you look around a little more, there are a ton of people who have had faulty tensioners that caused excessive chain stretch in 10k miles or less. Mine was one of them. I rebuilt all of the timing bits, and I've since gone to a manual tensioner and in 2k miles it hasn't needed to be adjusted.


Also, for all of you who are measuring out your oil amounts, it's better to just get the bike vertical (balanced on its two wheels) and fill it until it is in the middle of the sight glass. Start it, run it for a few minutes to fill the oil filter, stop, wait for the oil to drain back, check again, and then you're good. You'll never get all the oil out of the engine, so always go by the sight glass.
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Old 09-19-2013, 09:26 AM   #3548
Jaunty
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my oil looks clean and its in the middle of the sight glass.

i believe the previous owner lost the rubber valve cover gasket and used some type of form a gasket as its oozing out (unless that was the actual head gasket area, i'll have to look again).

thanks for the info guys
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Old 09-19-2013, 09:55 AM   #3549
SkidMarx
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Quote:
Originally Posted by gearheadE30 View Post
If you look around a little more, there are a ton of people who have had faulty tensioners that caused excessive chain stretch in 10k miles or less. Mine was one of them. I rebuilt all of the timing bits, and I've since gone to a manual tensioner and in 2k miles it hasn't needed to be adjusted.


Also, for all of you who are measuring out your oil amounts, it's better to just get the bike vertical (balanced on its two wheels) and fill it until it is in the middle of the sight glass. Start it, run it for a few minutes to fill the oil filter, stop, wait for the oil to drain back, check again, and then you're good. You'll never get all the oil out of the engine, so always go by the sight glass.
If you look around a little more and pay attention, there are very few people who have actually had the ACCT fail on the XT350. There are some, and they are very vocal, and there seems to be a general distrust of the things which I suspect is bleed-over from the DRz400 crowd where there was a real issue.
Many people have switched them out because they suspected something was wrong, but in most cases it wasn't the problem.

I'm not saying that they don't fail, but because of the way they are made, they either work or they don't. They use a flat coil spring (like in a watch) those springs don't generally wear out over time. If they get fatigued, they simply break. Depending on where they break, they can also be fixed. Look here.

BTW, The cam chain tensioner can not cause your cam chain to stretch out.
In order for that to happen the spring would suddenly have to be more powerful, the chain guides would have to be made of something that doesn't wear out, and the chain would have to be built like the one in a XR200.
The Cam chains in these bikes are not weak. It's a proper multi-plate design, and won't stretch easily.

What a bad ACCT can do if it fails is cause the chain to jump which can be catastrophic. This is the reason that the people who have had them fail are so vocal. To them, the ACCT is the devil. Can't say that I blame them.

Some people choose to use a MCCT because they are worried about this possibility. I'm fine with that, to each their own.
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Old 09-19-2013, 10:06 AM   #3550
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Originally Posted by Jaunty View Post
my oil looks clean and its in the middle of the sight glass.

i believe the previous owner lost the rubber valve cover gasket and used some type of form a gasket as its oozing out (unless that was the actual head gasket area, i'll have to look again).

thanks for the info guys
A lot of people put a bunch of silicon gasket sealer on the gasket and it makes a mess. It also ends up in the oil screen which sucks. The rubber gasket includes the 2 half circle plugs you can see on the left side of the head so it isn't likely missing. It fit's in a slot in the cover and I'm pretty sure it doesn't actually require any sealant. You will want to look that up though. It is reusable.
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Old 09-19-2013, 01:12 PM   #3551
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Put in 1300 cc oil, did about 10 miles, still smoking, bike runs good though. I'll do a compression and a leak down, just need to borrow some gages.
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Old 09-19-2013, 01:57 PM   #3552
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Good Advice

These guys are giving you a lot of very good advice. These engines are pretty bulletproof. I put 35,000 miles on my first one (38,000 miles total) before I checked the valves and they were still spot-on. The entire valve train still looked like new. I ran Castrol 10w40 and changed it as soon as it appeared dirty which was often as the engine had only a metal screen for an oil filter. Definitely invest in new intake boots. These are the weak point of this engine.
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Old 09-19-2013, 07:21 PM   #3553
oceansfiftyseven
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Hey sjc56, I would also suspect the muffler for the smoking. Before I replaced mine on my XT and repaired the top end, mine would smoke when warmed up. Sometimes badly. Carbon and unburnt fuel from my at the time crappy running XT, had built up in the exhaust. Saturating the packing. The harder I ran it the hotter it got and the worse it smoked. If it smokes at start up when cold, nevermind.
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Old 09-20-2013, 11:17 AM   #3554
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Hey sjc56, I would also suspect the muffler for the smoking
This was going to be my next suggestion.
Is it just a little smoke, or are you fogging the countryside?
To be honest, if it's just a little, keep an eye on the oil level and ride it. The thing is 25 years old. I'ts allowed to smoke and leak a little.
The compression and leak down will be good to know regardless.

If it is smoking at start up, and then quits, you have leaky valve seals. Not a big deal to fix if you're handy.
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Old 09-20-2013, 05:24 PM   #3555
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It's smoking when it's cold it's smoking when it's hot, birds are falling out of trees, the EPA has banned be from starting it, my town wants me to do mosquito fogging. Yup it smokes. I'll ride through the fall for short trips,and keep an eye on the oil, it seemed to have burned a quart in 50 miles. I'll just pretend it's a 2 stroke.
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sjc56 screwed with this post 09-21-2013 at 05:10 AM
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