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Author Topic: '71 T500  (Read 740 times)

Offline oldrookie

  • Posts: 61
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: 61
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: 61
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 :)

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Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

Offline oldrookie

  • Posts: 61
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.

Offline HURCO550

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Re: '71 T500
« Reply #20 on: May 19, 2017, 08:32:53 »
solid plan on the petcock, I rebuilt mine (gt250) but its still caused some headache, and I usually just end up having to run it in the "prime" position anyhow. I also am running a repop air box boot with no issues to date.

You may have to mess with those lines a bit though to make sure you get them flushed and the check valves work. Those are a pretty important component to the oil lubrication system.
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

Offline oldrookie

  • Posts: 61
Re: '71 T500
« Reply #21 on: May 19, 2017, 22:23:06 »

You may have to mess with those lines a bit though to make sure you get them flushed and the check valves work. Those are a pretty important component to the oil lubrication system.

Hoping to avoid messing with them much. Thinking they are pretty brittle at this point.

Did get the crankcase oil changed today, but not much else.

Offline Sonreir™

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Re: '71 T500
« Reply #22 on: May 20, 2017, 14:31:22 »
You may have to mess with those lines a bit though to make sure you get them flushed and the check valves work. Those are a pretty important component to the oil lubrication system.

You got details on how this process works? I'm at the same point in my build.
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Offline farmer92

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Re: '71 T500
« Reply #23 on: May 20, 2017, 14:38:31 »
I ran some WD 40 through mine, from the pump side
Had to bend the plastic straw to line it with the hole in the banjo


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