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Old 08-21-2012, 01:43 PM   #3046
gearheadE30
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Joined: Jan 2012
Location: Indiana
Oddometer: 742
Pretty much read this whole thread before/after buying my XT. Found one up in Detroit where I was working over the summer for a whopping $650. Called the owner and talked for a bit, learning that he had purchased the bike and it had developed a noise in the head. Had the valves adjusted, with no luck. Suspected the noise was the timing chain, and had too many projects, so I went to look at it. the chain was definitely rattly, but it started easily, ran well, only had 6300 mile on it (1986) and was otherwise okay. Ran it through the gears a few times and it was smoking like a mosquito fogger. I was hesitent, but eventually talked the owner down to $400 and rode it 32 miles home on dirt and gravel roads. After that, I parked it until the internship was over and then took it home, where I tore the engine down.

The timing chain guides had chunks taken out of them, the new timing chain fit comfortably inside the old one, and the tensioner was broken. There was also some scoring on the cylinder walls and the piston. After 6 oil flushes/filter cleanings/screen cleanings, I think most of the metal that the chain machined out of the head is gone.

I replaced the chain, converted the tensioner to manual, installed all new gaskets, honed the bore, cleaned up the piston, and took care of all the other little stuff that was wrong with it, along with shimming the needle on the primary and unscrewing the pilot a bit, and it ran beautifully. This is the first dirt bike or dual sport that I have ever owned, and it is awesome. I spent the last weekend at an off road park running singletrack, hill climbs, dunes, everything, and it never missed a step. Of all the bikes me and my friends had there, it was by far the most reliable, and it was just a blast.

Next steps are new fork seals, 20wt oil, 10cm of spring shimming, and maybe moving the rear shock circlip down a notch. Eventually I also need some streetable tires, too. So far I'm at $600 for everything, parts and all, so I feel like I got off pretty well. The bike runs beautifully, doesn't burn any oil, doesn't make odd noises, and really has no bad manners aside from weal forks.

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__________________
1986 Yamaha XT350
2005.5 KTM 950 Adventure
1991 BMW 318is turbo track car
1989 Chevrolet Caprice Classic Wagon sleeper tow car
3 Months Exploring the US on a 950
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Old 08-22-2012, 02:25 AM   #3047
Lenz1
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Maximum con rod small end diameter ?

Measuring up the piston etc The piston pin is 18.99mm over it's full length and the small end of the conrod is 19.03mm horizontally across the ID and maybe 19.035mm vertically. This translates to approx 1.5 thou" total clearance between pin and small end at 25deg celcius.

Does anyone have specs on the serviceable limits of the small end inside diameter ?
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Old 08-27-2012, 06:22 AM   #3048
jch
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Location: St. Louis
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Several XT350 items for sale

Rear wheel with Shinko 712R road tire - wheel is in very good shape and tire has over 50% tread - $100 plus shipping
Mounting bracket for speedo and tach - $15 plus shipping
Cylmer manual - $20 shipped

PM me for pictures or more info

jch screwed with this post 08-29-2012 at 07:00 AM
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Old 08-28-2012, 06:37 PM   #3049
Dirtdeville
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Rear Tire

Does the rear wheel fit the xt225 and if so is it beefier?
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Old 08-28-2012, 07:51 PM   #3050
jch
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No idea if it fits the xt225? Anyone??
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Old 08-28-2012, 10:18 PM   #3051
NordieBoy
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I'd be more tempted to go the other way and try an XT225 wheel in the 350.
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Old 08-29-2012, 09:30 AM   #3052
Dirtdeville
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xt225 wheel

The problem with the 225 wheels is the spoke pattern tends to cause some of the spokes to keep breaking and if you lace in thicker spokes they tend to pull through the weak aluminum hubs.Do the 350 wheels have steel hubs or maybe thicker aluminum?Are the XT350 wheels also a known weak point of the bike?
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Old 08-29-2012, 05:10 PM   #3053
gearheadE30
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I've hammered the crap out of my wheels and I've not damaged one yet. They are aluminum, but they seem to be pretty beefy.
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1986 Yamaha XT350
2005.5 KTM 950 Adventure
1991 BMW 318is turbo track car
1989 Chevrolet Caprice Classic Wagon sleeper tow car
3 Months Exploring the US on a 950
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Old 08-29-2012, 06:12 PM   #3054
Dirtdeville
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Thanks for the reply-do you know if the hub is steel or aluminum?I noticed it's black telling me it might be steel.If it is I will probably take a chance and try it.
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Old 08-29-2012, 06:42 PM   #3055
NordieBoy
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Quote:
Originally Posted by Dirtdeville View Post
Thanks for the reply-do you know if the hub is steel or aluminum?I noticed it's black telling me it might be steel.If it is I will probably take a chance and try it.
Alloy hub.
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Old 09-03-2012, 11:42 AM   #3056
ahook93
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in need of spoke and nipple

bought a 2000 xt350 the other day as my first dual sport. got it all cleaned up just need a spoke nipple for the rear wheel. the spoke might still be useable. all I can find online is entire sets which I only need one. are they universal with any other bikes? or can someone point me in the correct direction where I can buy just a few?
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Old 09-04-2012, 05:59 AM   #3057
Lenz1
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Quote:
Originally Posted by Lenz1 View Post
Measuring up the piston etc The piston pin is 18.99mm over it's full length and the small end of the conrod is 19.03mm horizontally across the ID and maybe 19.035mm vertically. This translates to approx 1.5 thou" total clearance between pin and small end at 25deg celcius.

Does anyone have specs on the serviceable limits of the small end inside diameter ?
It appears the point at which the piston pin and conrod small end show unacceptable wear is somewhat subjective according to the Yamaha TT350 manual I have. An engine builder that I have confidence in has advised me that "ovality" in the rod small end is important but a "few 10ths of a thou" like I've measured should be OK (.01mm = 0.0004" and the Mitutoyo Digital Caliper measured less than .01mm difference between horizontal and vertical ID's)

I've ordered a new piston pin anyway, the piston looks and measures OK but the rings show fine vertical scoring under magnification so new rings too. The bore has been given a light hone and should be OK. (600grit wet and dry paper on a spindle at ~ 3000rpm using kerosene as the cutting oil produces a fine sealing surface for new rings)
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Old 09-08-2012, 05:45 AM   #3058
gearheadE30
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TT350 and XT350 wheel differences

I needed a second rear rim so I could have a set of knobbies and a set of DS tires, so I bought what I thought was an xt350 rim on ebay. It wasn't, and they aren't interchangeable. The TT rim is narrower, it doesn't have cush drive, the sprocket mount has a very large diameter bolt pattern, it uses a different axle, and the bearings are different.

On that note, I have a TT350 rear wheel in mechanically awesome but cosmetically average shape for sale. PM me if you're interested. Looking for ~$100 out of it, but I'm pretty flexible on the price so don't hesitate to make an offer. I can send pics if you want.
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1986 Yamaha XT350
2005.5 KTM 950 Adventure
1991 BMW 318is turbo track car
1989 Chevrolet Caprice Classic Wagon sleeper tow car
3 Months Exploring the US on a 950
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Old 09-08-2012, 07:38 AM   #3059
Rustyslug
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Quote:
Originally Posted by tjrockit View Post
Here's a pic of my XT350.
Even though it is a little hard to start sometimes, I have been very pleased with how well it performs both on and off road. I use is as a daily communter during the week and then go off roading on Saturdays.


Hi there,
Sorry for jumping in like this.

I bought my 97 XT350 about 4 months ago and its great.
The thing is, I dont have a vinyl on, only a white kit and is desperately looking for this vinyl. The only ones i get by my local Yamaha dealer have pink in. I am not a big fan of the pink or purple, lol.

Can anybody please help me, if i can have the pic a have a friend that will print and cut it.
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Old 09-08-2012, 10:58 PM   #3060
NordieBoy
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Quote:
Originally Posted by gearheadE30 View Post
I needed a second rear rim so I could have a set of knobbies and a set of DS tires, so I bought what I thought was an xt350 rim on ebay. It wasn't, and they aren't interchangeable. The TT rim is narrower, it doesn't have cush drive, the sprocket mount has a very large diameter bolt pattern, it uses a different axle, and the bearings are different.
Both rims should be 2.15" wide.

The TT rim has the stupid "Z" spokes and 2 bearings each side.

Both my TT rims are rotting out with age.
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