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Author Topic: '71 T500  (Read 2699 times)

Offline Hurco550

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Re: '71 T500
« Reply #10 on: Apr 26, 2017, 23:06:38 »
I have never torn an engine down, but I'm game to try.

Good on ya. Take pictures during disassembly, lots of them, and if you get stuck on anything and have questions just ask them here. There are tons of people willing to help, and lots who have seen the inside of a t500 motor a good number of times. You got this man

Sent from my SM-G900V using Tapatalk
« Last Edit: Apr 26, 2017, 23:09:40 by HURCO550 »
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #11 on: Apr 27, 2017, 11:30:03 »
Good on ya. Take pictures during disassembly, lots of them, and if you get stuck on anything and have questions just ask them here. There are tons of people willing to help, and lots who have seen the inside of a t500 motor a good number of times. You got this man

Sent from my SM-G900V using Tapatalk

Fortunate that I have summers off. Looks like this project will take some time to do correctly and I really like the bike.

Thanks for the encouragement.

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #12 on: Apr 27, 2017, 11:38:50 »
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.



Ordered. Thanks for the link.

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #13 on: Apr 29, 2017, 15:59:58 »
Took a shot at cleaning the carbs with a DIY soda blaster. Results aren't bad, but need to wait until I can get totally outside and close the garage door. Quite the mess to clean up.



Halfway through cleaning the float bowl.



Making an aux tank so I can test the bike without a tank on since I can't do the rest of the soda blasting right now.

Offline Hurco550

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Re: '71 T500
« Reply #14 on: Apr 29, 2017, 16:17:50 »
Took a shot at cleaning the carbs with a DIY soda blaster. Results aren't bad, but need to wait until I can get totally outside and close the garage door. Quite the mess to clean up.



Halfway through cleaning the float bowl.



Making an aux tank so I can test the bike without a tank on since I can't do the rest of the soda blasting right now.
Looks great. Fyi, actual soda blast media works head and shoulders above store bought boxes. I got a 50lb. Bag at harbor freight a while back and it's lasted me a while, though lots of carbs and two sets of cases. Definitely worth the $$. Also, make sure you rigorously clean the carbs passages AFTER soda blasting. I had some clogging a pilot circuit once after soda blasting and it was a real bear to get it all out. I ended up putting it in a pot of almost boiling water to get it loosened up.

Sent from my SM-G900V using Tapatalk

Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #15 on: Apr 29, 2017, 22:44:36 »
Very good to know, HURCO550. I've never done any media blasting so a lot of learn. Appreciate the information.

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #16 on: May 07, 2017, 17:43:49 »
Working on cleaning carbs still. Blaster works, but needing to wait until I can get it outside the garage. Been raining a lot this last week and I've got one more week until finals week, so too much to do other than noodle around with the bike a bit.

Did go get the title work done so I can register it when I get it running again.

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #17 on: May 18, 2017, 20:43:42 »
Carbs are clean and reinstalled. Set the slides last night.

Spent a few minutes draining a bit of the old two-stroke oil out of the tank this evening.

Decided I would fill the tank with a different color oil (has green in the tank and in the line) so I can see the line change color if the oil pump is working correctly when I try to start the bike. Probably going to give that a try early next week after my final grades have been turned in.

Going to have a friend with a lot of experience building and riding two-strokers come by when I give that a try just to have someone who knows what to listen for if anything is wrong.

The rubber bit connecting the airbox to the carbs is in bad shape, but I think I'll use tape to seal it up enough to try to start the bike. Just want to know if it is going to run.

Next job, prior to trying to start it, is to drain the crankcase put a fresh 1200ml of oil in.

Offline Hurco550

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Re: '71 T500
« Reply #18 on: May 18, 2017, 23:50:23 »
Good idea with the oil. Don't panic if it doesn't change to the new color right away. The oil doesn't run through those things in a very quick hurry. Also, be very careful with those plastic oil feed lines, they are hard to find if you break them. I used a cheap harbor freight oil pump with alcohol to flush mine out, but remember they have little check valves in the union where it splits off. Fluid should only flow one direction.

Make sure to take a video of it running :)

Sent from my SM-G900V using Tapatalk

Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline oldrookie

  • Posts: 68
Re: '71 T500
« Reply #19 on: May 19, 2017, 08:16:48 »
Good idea with the oil. Don't panic if it doesn't change to the new color right away. The oil doesn't run through those things in a very quick hurry. Also, be very careful with those plastic oil feed lines, they are hard to find if you break them. I used a cheap harbor freight oil pump with alcohol to flush mine out, but remember they have little check valves in the union where it splits off. Fluid should only flow one direction.

Make sure to take a video of it running :)

Sent from my SM-G900V using Tapatalk

Ahhh...the joys of bringing a 46-year-old bike back to life. Searching for parts, brittle plastic and uncertainty about whether it will run when you get done.  ;D

I've see reproduction airbox rubber bits, so I'll likely get one ordered. Need a petcock (probably just go with a non-vacuum type and cap the vacuum port on the carb.)

Kind of amazed at how many parts are available, but the odd part crops up that I can't get. The petcock rebuild kits don't have the screen--no longer available anywhere--and those oil lines are next to impossible to replace, so I'm hoping not to have to touch them.