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Old 01-08-2013, 01:43 PM   #571
TheLorax
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OK I'll play

Can't say that I have a dedicated obsession for the 2 valve Yamahas, But I've certainly built and abused a few over the years.

......some more rocks in the middle.

Should never have let this bike go. What it lacked for ugly, it more than made up for in with sheer will.

When the human race is past and the cockroaches and trillobytes are finally gone, the XT will remain.

Had some others over the years......

A bygone era of lightweight superbike. The fun remains.

Made a few mistakes...

Then again there were bad days.

before you judge.....that was a very cool hairstyle at one time.

Bad hair decade.
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Old 01-08-2013, 02:24 PM   #572
captain awesome
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Quote:
Originally Posted by motomike14 View Post
Just make sure you put your cam in the right way. Last time I had a motor rebuilt, we screwed up and put the cam in 180 out. Luckily, rotating the points plate 180 alleviated that issue.
There is an easy fix that doesn't require the points plate being set reversed or pulling the top end. I don't think you can get the points cover back on, or at least easily otherwise if you flip the plate 180.

When you place the points cam gear and line it up with the dots originally, make sure it is on the proper stroke or the timing will be out 180. It may have not been the cam that was installed improperly, but the points gear itself. I know it is super easy to mix it up as I recently did this myself. Just pop the clutch side cover off, and rotate the gear to the proper stroke if you run into the issue.

It's the gear in the bottom right of the pic.

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Old 01-24-2013, 04:18 PM   #573
dsilver1007
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I had a 78 xt500. Couldnt ever get it to run perfect tho. had a 38 mikuni, 540 kit, 81 xt head, bassani pipe and other stuff. My old man has one similar in the garage he never has parted ways with. xt500's have some of the best exhaust notes ive heard.
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Old 01-24-2013, 04:31 PM   #574
pabloxt500
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38mm Carb is to big even for a 540CC.
a 36mm would have been better.
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Bikes in hand:
1978 Yamaha SR500 #119!
1977 Yamaha XT500
1977 Yamaha XS650
1978 Yamaha XS400
1978 Honda CB550K
1970 Honda CT90
1965 Ducati Monza 250

Sold off:
1992 Yamaha FZR600
1978 Yamaha SR500- I miss it so much.
1981 Yamaha Seca 550
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Old 02-28-2013, 11:35 AM   #575
Off-Road-Adventures
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Question Large Tank for XT500 wanted

Hi Guys

Please help me.

Does anyone know where I can get a really big tank for my XT500? around 30 LITRES? Does a XT600 Tenere tank fit a XT500?

Thanks
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Old 02-28-2013, 11:54 AM   #576
pabloxt500
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you might have better luck making one, or modifying a stock tank.
the larger clarke tank isn't even close to that.
http://clarkemfg.com/yz-250400-7879-...sal-p-261.html

if you do find one, please let me know, the VJLA death valley ride is is 2 weeks.
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Bikes in hand:
1978 Yamaha SR500 #119!
1977 Yamaha XT500
1977 Yamaha XS650
1978 Yamaha XS400
1978 Honda CB550K
1970 Honda CT90
1965 Ducati Monza 250

Sold off:
1992 Yamaha FZR600
1978 Yamaha SR500- I miss it so much.
1981 Yamaha Seca 550
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Old 03-03-2013, 08:08 AM   #577
Mr Puffin
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Quote:
Originally Posted by Off-Road-Adventures View Post
Hi Guys

Please help me.

Does anyone know where I can get a really big tank for my XT500? around 30 LITRES? Does a XT600 Tenere tank fit a XT500?





Thanks




Hi Allen, for a large tank try ebay germany or put a wanted add on the XT500 Forum http://www.xt500.co
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Old 03-04-2013, 03:20 AM   #578
edgy
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I found a beaut at last a week ago!
Now i cant post a pic??
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Old 03-04-2013, 01:59 PM   #579
Pigford
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Talking

Just done a deal for this gorgeous beasty......









A good mate of mine had a TT500 from new back in the early 80's. He emigrated to OZ in mid 1980's and left me with his bike - to sell & send him the cash. I regretted not buying it off him - only got 350 back then as although it was road registered, he had lost the reg docs, etc!

Anyhow, it looks ace - apart from the naff front muddy - this one should be in my garage on Friday

Pigford screwed with this post 03-05-2013 at 09:51 AM
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Old 03-18-2013, 12:42 PM   #580
Sidecar Jockey
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I just now got around to going through my motor. When i got it it smoked like a train. It puffed at idle, but give it any gas at all and it would make a HUGE smoke screen. So, I tore it down:

I cleaned up the head, lapped in the valves, and replaced the valve stem seals. The guides seemed to be good, the valves didnt have any 'wobble' in them, but I didnt have a bore gauge small enough to measure the guides...

Th piston looks brand new and is .5 mm over. On my micrometer, it measured 87.51 mm. I measured several different points. My cylinder measures 87.56 mm. I got the same reading at the top, middle, and bottom using a bore gauge. I'm comfortable with my tools, and with measuring cylinders and pistons, so I'm pretty confident in my readings.

The piston, rings, and cylinder hone looked brand new. There was no carbon, scoring, or heat discoloration anywhere to be found. There was nice even cross hatch all over the cylinder, no glazing or scratches.

I also measured the ring end gaps, and they are all within spec.

I did find that all of the rings (both top compression rings and the oil ring) had their gaps lined up when I took the motor apart, with gaps facing forward. I assumed this was causing my extreme smoking. I staggered the gaps 120 degrees during the re-install.

I put the motor and bike back together, and started it up. IT STILL SMOKES!!! I rode it about 25 miles, and it never stopped. It smokes 50% LESS than before, but it still smokes a lot and makes a big cloud.

So, it smokes a little from idle to 3000-ish rpm, but hardly any at all (the very little amount it smokes at idle through 3000-ish rpm is acceptable to me). It does not smoke more at start up, and does not seem dependent on engine temp. Above 3000 RPM it smokes like a steam train. The smoke looks white, and has very little smell.

Ok guys, I'm stumped. Its NOT wet sumping... my oil level doesnt change after sitting... and the smoking never stops, even after the bike is warmed up.

Any suggestions from the Xt500 gurus?


also, I could not find any markings on the rings to indicate a top or bottom side... they looked like they were the same on both sides. Is this true?

Sidecar Jockey screwed with this post 03-18-2013 at 01:02 PM
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Old 03-18-2013, 01:11 PM   #581
dsilver1007
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Quote:
Originally Posted by pabloxt500 View Post
38mm Carb is to big even for a 540CC.
a 36mm would have been better.
there is a 38mm on the 1980(1981ish) xt500 in the garage that has had the same set up for 20+ years and it runs flawlessly
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Old 03-18-2013, 01:24 PM   #582
Pigford
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SJ - it could well be the engine was not run-in right & the bores have "glazed".

If a quality synthetic oil is used for the running-in period, this can effect the rings bedding in and the ring/cylinder seal does not happen

A fresh light hone may help if this is the problem - then run-in for a few hundred miles using a cheapo/basic mineral oil
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Old 03-18-2013, 01:34 PM   #583
pabloxt500
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Quote:
Originally Posted by Pigford View Post
Just done a deal for this gorgeous beasty......









A good mate of mine had a TT500 from new back in the early 80's. He emigrated to OZ in mid 1980's and left me with his bike - to sell & send him the cash. I regretted not buying it off him - only got 350 back then as although it was road registered, he had lost the reg docs, etc!

Anyhow, it looks ace - apart from the naff front muddy - this one should be in my garage on Friday
you'll be happy to know you can get a new correct front mud guard for your bike.
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Bikes in hand:
1978 Yamaha SR500 #119!
1977 Yamaha XT500
1977 Yamaha XS650
1978 Yamaha XS400
1978 Honda CB550K
1970 Honda CT90
1965 Ducati Monza 250

Sold off:
1992 Yamaha FZR600
1978 Yamaha SR500- I miss it so much.
1981 Yamaha Seca 550
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Old 03-25-2013, 06:22 PM   #584
xt500nz
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Thumb

Quote:
Originally Posted by dsilver1007 View Post
there is a 38mm on the 1980(1981ish) xt500 in the garage that has had the same set up for 20+ years and it runs flawlessly
a detuned 38mm will run well enough on a stock bike, but a 34mm oem with a proper tune will do the same. pumper carbs over two stroke 38mm when tuned by the right person!
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Old 03-25-2013, 08:20 PM   #585
Rd650
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Quote:
a detuned 38mm will run well enough on a stock bike, but a 34mm oem with a proper tune will do the same. pumper carbs over two stroke 38mm when tuned by the right person
I agree with what you are saying, but the bike he refers to with the the 38carb has a 540 Arias piston, White Brothers WB1 cam and a full exhaust.
It would smoke most of the XT/TT500s I have come across in the last 30 years. DSilver is correct we never got his runnung to its full potiental.
Broke in on GTX 20w50
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