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Author Topic: '71 T500  (Read 2707 times)

Offline oldrookie

  • Posts: 68
'71 T500
« on: Apr 26, 2017, 10:53:08 »
So it appears that old Suzukis seem to find me.

Been a while since I last posted because I sold my last project bike ('83 GR650) a few years ago. I had brought it to excellent running condition, but cosmetically it was still a project. Two daughters decided to get married in the space of four months and I needed money more than the bike. Didn't hurt that I picked up an '01 SV650 in excellent shape as a primary ride, so I reluctantly sold the GR.

Have been wanting another project, but had no idea what I wanted or where to find one that spoke to me.

A couple of years passed and a riding friend called to tell me his neighbor is moving and wants to sell a couple of Titans. Would I know anyone who might be interested?

"Sure, what's a Titan?" (I was into dirtbikes in the '70's and streetbikes were not even a blip on the radar.)

Did a little research and came home with two bikes. A '72 in boxes, a '71 in pretty good nick.

Sold the parts three days later and started on the carbs.









More later.
« Last Edit: Apr 27, 2017, 11:23:27 by oldrookie »

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #1 on: Apr 26, 2017, 14:48:26 »
Well, it is later, so bit more about this.

Just got back from buying the tubing, etc., to turn my blow gun into a soda blaster so I can clean the carbs better. Going to DIY an auxiliary gas tank so I can try to start the bike after I get the carbs clean too.

Want to get it started to see what I'm actually working with before I spend the $ to strip the tank. It is a bit rusty and I don't want to fill it with gas to try starting it until I'm sure it is solid.

There are two known issues with the T500--apparently--that might make it tough call about whether to continue bringing it back. One is that the crank seals can dry out and that means tearing the crankshaft apart to replace the seals, if you can even find them. The other is possible damage to third and fourth gear due to a lack of oil.

Suzuki designed it for 1200ml of oil, but later created a work around to get it to 1400ml due to owner complaints about oil starvation affecting the mentioned gears. A trashed transmission may make this a parts bike , but can't tell til it runs.

A few more pics for the starting point.




Online Sonreir

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Re: '71 T500
« Reply #2 on: Apr 26, 2017, 14:53:10 »
5th gear is the real concern.

For the crank parts, check these guys out: http://www.knalnaarpotz.nl/onderdelen/catalog/index.php?cPath=23_164_166
Sparck Moto - http://www.sparckmoto.com

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Offline JSJamboree

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Re: '71 T500
« Reply #3 on: Apr 26, 2017, 15:23:04 »
Going to have to start watching all the T500 builds with my KZ nearing complete and the MT almost done, my T500 is next on the list.

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #4 on: Apr 26, 2017, 16:39:24 »
5th gear is the real concern.

For the crank parts, check these guys out: http://www.knalnaarpotz.nl/onderdelen/catalog/index.php?cPath=23_164_166

Thanks. Still learning about the bike and where to get parts.

Offline Hurco550

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Re: '71 T500
« Reply #5 on: Apr 26, 2017, 20:32:44 »
Well, it is later, so bit more about this.

Just got back from buying the tubing, etc., to turn my blow gun into a soda blaster so I can clean the carbs better. Going to DIY an auxiliary gas tank so I can try to start the bike after I get the carbs clean too.

Want to get it started to see what I'm actually working with before I spend the $ to strip the tank. It is a bit rusty and I don't want to fill it with gas to try starting it until I'm sure it is solid.

There are two known issues with the T500--apparently--that might make it tough call about whether to continue bringing it back. One is that the crank seals can dry out and that means tearing the crankshaft apart to replace the seals, if you can even find them. The other is possible damage to third and fourth gear due to a lack of oil.

Suzuki designed it for 1200ml of oil, but later created a work around to get it to 1400ml due to owner complaints about oil starvation affecting the mentioned gears. A trashed transmission may make this a parts bike , but can't tell til it runs.

A few more pics for the starting point.





I don't know where your at mechanically speaking, but splitting the crank case to replace the seals isn't a terribly hard job on these old Suzuki smokers. they split laterally (not like some of the older dirbikes) just take your time and have a clean bench that you can organize all the stuff. Crank seals should be considered a must on a bike this age. its a maintenance item at this point. leaky seals = lean air fuel mixture which = bad things for the crank and pistons. I wouldn't let having to do crank seals deter you from this build. Often you can get by with just the outside two seals being replaced, which doesn't always warrant a full crank rebuild. I have a local old school engine guy that has inspected a few two stroke cranks for me, and usually he says to just replace the outside seals, and it hasn't done me wrong yet.

also, if your on facebook, look up the Suzuki two stroke twins page as well as the t500/ titan page, there is a ton of good info on there and people willing to help. Also, do some digging, there is an oil dam that you can put in the tranny to help with the gearbox oiling issue. while you have it apart would be the time to do it.

By the looks of the pictures, you have a very nice original bike there. I would really urge you to do what you have to do to make it ridable and right. The bike is worth it IMHO.

Thanks for sharing the build here!
« Last Edit: Apr 26, 2017, 20:35:11 by HURCO550 »
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
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1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
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Offline CrabsAndCylinders

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Re: '71 T500
« Reply #6 on: Apr 26, 2017, 20:35:55 »
Do a leak-down test before you take it apart, to test the seals but safer to just replace them.  A Suzuki guy told me that it is only the outer seals that go but I wouldn't trust that.  I hope you don't part it out, cranks and gear clusters are around if you need them.  I'll be watching this one.
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Offline CrabsAndCylinders

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Re: '71 T500
« Reply #7 on: Apr 26, 2017, 20:40:19 »
I would defer to Hurco on the outer seal thing.

http://www.ozebook.com/compendium/t500index.htm

http://gt500.org.uk/
Lighter, Quicker, Faster.
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Offline farmer92

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'71 T500
« Reply #8 on: Apr 26, 2017, 21:37:20 »
https://www.ebay.ca/itm/382047991680

Here's a kit, full crankcase seals, the fellow who rebuilt my crank (vintage sled guy) said they were as good as any.

Cheap insurance that you won't have to tear the engine apart twice IMO.

That bike is MINT, you lucky bastard, can't wait to see how you get on.

If you are used to wrenching, the engine can be pulled out and apart in under an hour if it's not to rusted and the screws aren't all stripped to shit.

If you do open the engine, close it with these

http://www.a2stainless.co.uk/Suzuki-T500-GT500-Engine-Casings-Stainless-Allen-Screw-Kit_AR2OR.aspx

They are lovely

Good luck with it

Edit:
Nova engineering in the uk make replacement gears / trans parts if you need

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #9 on: Apr 26, 2017, 22:42:44 »
Thank you all for the advice, information, and encouragement. I'm going to do everything feasible to get this old bike back on the road, so a lot of what you have posted is good news.

farmer92, The PO had taken the '72 down to parts and then bought the '71 so he'd know how to put it back together. I found a package in the parts bin of that stainless steel set you linked me too in the box, so they will be put to good use.

I have never torn an engine down, but I'm game to try.

Heading for the end of the semester, so time is going to be pretty limited until late May. I'll update as I get time to work on the bike.