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Unread 2013-12-09, 11:47 AM   #1
Billy Mild
 
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Default Taking on a new project

Pretty soon I will be starting a resto of a 1971 Yamaha AT1c. It is a small 125 cc. 2 stroke enduro motorcycle. My mom is the original owner, but hasn't ridden it in a long time. It has been sitting for a few years. I would like to tear it down, re-do the wiring on it, clean out the tank fix the body work. Overall the bike is in decent shape, but will require a little love to get back to running 100%. I am also looking to upgrade to the CT1(175cc) cylinder and piston kit.

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Unread 2013-12-09, 12:13 PM   #2
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Sweet little bike. Looking forward to the outcome
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Unread 2013-12-09, 12:42 PM   #3
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Quote:
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Sweet little bike. Looking forward to the outcome
I'm keeping it an enduro, but I want to give the old girl a little more pep. I have a performance yamaha GYT kit pipe on the bike. That really woke it up, but I think the rod in knocking a little bit. At least I vaguely remember that from the last time I rode it.

I will try and make a build thread I'm bad with taking pictures of anything I do.
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Unread 2013-12-09, 12:44 PM   #4
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Following.
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Unread 2013-12-09, 01:45 PM   #5
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Cool little bike. Gonna give it any cafe styling or just keep it stock looking?
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Unread 2013-12-09, 02:59 PM   #6
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No cafe. This bike is going to stay a true enduro.
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Unread 2013-12-23, 10:39 AM   #7
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So I finally got around to getting a few pics of the bike. It is in much better shape than I remember.











I'm not sure if I will take it down to the bare frame or not yet. I noticed there was some gas that leaked out of the carb from sitting so long. I will get that fixed up.

So far my plans are to get the bike back to KC, start the tear down of the body parts and front end. Look into getting a front end with a disc brake if possible and some slightly better forks. I need new rear shocks and it will go from there.
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Unread 2013-12-23, 10:49 AM   #8
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Awesome! I want to restore a vintage bike sooo bad. Subscribing to watch it progress.
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Unread 2014-03-17, 07:24 PM   #9
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Unread 2014-03-17, 07:28 PM   #10
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I finally got the bike this weekend. First thing is to get the battery and throw fresh gas in it. After I have confirmed old girl still runs then it will be time get the project started. Hasn't been run for 5 years or more.

I need to find a body guy who does motorcycle work. I'm not sure how far I will take it, but at least make it look good. I need to fix the pipe as the muffler guard is rusted off.
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Unread 2014-03-23, 01:54 PM   #11
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Before I make my decision of a nut and bolt restoration, I want to fire up the bike. In order to do that I have to clean out the 5 year old gas that is in the tank, change the transmission fluid which has been in there since I replaced the clutch over 10 years ago, and route a new fuel line since the one that was on there fell apart in my hands. I am also going through the carb just to be sure there wasn't any gas left in there.

So far the carb looks great, but the bowl gasket is ripped. I will be making a new one.



I also need to find a shop that can fix my exhaust pipe's heat shield. Half of it is missing and that is not only a burn hazard, but it is very sharp. I have another "stock" pipe for this bike, but I want to stick with the expansion chamber. I got a quote from Blue Star cycles, and they told me it would be about $5-600 to fix it like the factory design.
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Unread 2014-03-23, 04:08 PM   #12
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That'd be a sweet little in town bike.
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Unread 2014-03-23, 06:37 PM   #13
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I would just manually pour gas into the carb via a auxiliary tank. Also i would be suprised if you have spark. 30+ year old electronics usually dont like workimg after they have sat for awhile
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Unread 2014-03-23, 07:05 PM   #14
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Quote:
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I would just manually pour gas into the carb via a auxiliary tank. Also i would be suprised if you have spark. 30+ year old electronics usually dont like workimg after they have sat for awhile
Before this 5 year stint, the longest it was in storage without running was 2 years. It fired right up with fresh gas. No work at all. I have a feeling this time will be the same. I will have a brand new battery, fresh 91 octane gas with a little oil in it 50:1 ratio and a fresh plug.
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Unread 2014-03-25, 08:16 PM   #15
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Fired right up after 2 kicks. I may need a different pilot jet. I have the air idle screw at 1/2 a turn out. Anymore and the bike dies right off idle.

Something went wrong. Please make sure you added the video correctly.

Video URL: http://www.youtube.com/watch?v=EdzLngQdQhM
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Unread 2014-03-25, 09:43 PM   #16
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I love it!
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Unread 2014-03-25, 10:00 PM   #17
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Yamaha 2 strokes are the most reliable bikes made. Period.
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Unread 2014-04-08, 07:48 AM   #18
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So it looks like I am just going to get the bike safe to ride on the street now that I know it runs.

First thing is suspension, then brakes, and anything else that would make it fail inspection. The front forks have been leaking for a while. It has 0 dampening effect. There was some oil left in them, but it rode terribly. Handled like crap. It isn't a bad thing to get rid of that fish oil in the forks. Next up will be finding either some good NOS Redwings shocks or throwing a set of TEC shocks on.

Here are the pics.



At this stage I am tempted to just tear the whole bike down, but I will wait until fall to do that.


Do these need to be polished at all? I don't want my new fork seals to leak right away if i can prevent it.
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Unread 2014-04-16, 08:56 AM   #19
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I am int he middle of rebuilding my forks. It looks like I will just need to polish up the fork legs in order to re-use them. Is a fork seal driver needed?



I don't want to mess this up and have to redo it after it is all together.
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Unread 2014-04-16, 09:35 AM   #20
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I wouldn't worry about polishing unless they are really pitted. Use a pvc pipe as the fork seal driver.
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Unread 2014-04-20, 09:18 PM   #21
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Should I paint the fork legs or have them powdercoated?
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Unread 2014-04-20, 10:12 PM   #22
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Do you feel like taking them apart
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Unread 2014-04-21, 08:20 AM   #23
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Quote:
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Do you feel like taking them apart
They are apart right now. Hence the question.
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Unread 2014-04-21, 08:35 AM   #24
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Are you doing the rest of the bike at the same time? If yes, then you might as well
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Unread 2014-04-21, 09:16 AM   #25
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Are you doing the rest of the bike at the same time? If yes, then you might as well
No this will only be for the summer. In the winter I will be stripping the bike down. I just want it to be safe to ride. The plan is to get this bike running correctly and have safe working brakes/suspension get it licensed.
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