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The longest AT1 build ever (probably) 1st time enduro owner!

30 Jun 2020 21:01
mac3
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The longest AT1 build ever (probably) 1st time enduro owner! #1
Hey guys, thought I might as well say hello ( yamaha-enduros.com/index.php/forums/fng-...-guy-1970-at1#107036 ) since I'm going to be staying for awhile. I'm sure the questions will start soon, actually I have a lot of questions but I don't want to wear out my welcome. So jus pics of the bike for now.

1970 AT1 12volt

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30 Jun 2020 21:03
mac3
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The longest AT1 build ever (probably) 1st time enduro owner! #2
Seats in decent shape i think. Fenders have a little bit of light rust, rear sprocket chewed up.

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30 Jun 2020 21:06
mac3
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The longest AT1 build ever (probably) 1st time enduro owner! #3
Throttle cable full of crab, cracked fin on head. Crack in the ignition coil, hope its ok.

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30 Jun 2020 21:10
mac3
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The longest AT1 build ever (probably) 1st time enduro owner! #4
Wire harness worries me as im guessing the kid cut it open and that's what all the tape is for. I'll be google image searching the wiring connections before I come bug you guys. Figure i better start there before even thinking about a cdi or 175, or zinc plating everything ii see etc..

But that's it, that's my bike!

Thanks

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02 Jul 2020 20:53
mac3
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The longest AT1 build ever (probably) 1st time enduro owner! #5
So finally got spark last night, so I decided to take the carb apart. Had a bunch of what looked like wet sawdust

The sonic cleaner didnt really do much so i made one od them soda blasters and it seemes to work pretty good



Some pitting but I think thats ok. That brass tube and the outlet were plugged full of dried oil dirt or something. Long soak and lots of air and got it cleaned out.

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02 Jul 2020 20:56
mac3
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The longest AT1 build ever (probably) 1st time enduro owner! #6
Now i have a real question, these 2 holes let air pass straight to the outside on either side of the carb. Is that normal or is there supposed to be a ball valve or something there?

These two holes


I can blow air all the way through to these holes


That normal or no?

Thanks

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02 Jul 2020 23:11
apex
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The longest AT1 build ever (probably) 1st time enduro owner! #7
Yes, that's normal. Bowl chamber vents. Plug those off, and your carb will overflow from every single orifice.

Allrighty Then

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02 Jul 2020 23:36
mac3
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The longest AT1 build ever (probably) 1st time enduro owner! #8
Thank you.

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03 Jul 2020 23:04
mac3
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The longest AT1 build ever (probably) 1st time enduro owner! #9
So all my cables were stuck, so tonight i decided to try to clean them up. I think the clutch cable is ok but the throttle cable at the grip is busted and the oil pump cable was busted.
Long story short, took off the RH cover and the gear for the oil pump spins ok, but the cam the cable goes to wont move at all. That normal? Cable provides enough leverage to turn that and i just have weak grip strenght?

That normal? I think its deet that rebuilds pumps? Behind the oil pump cover had a bunch of dirt in it and the speedo cable didnt want to come willingly out of the gear.

Other than that i think in my uninformed opinion that the clutch pack(without taking apart) and all the gears look ok. No bad backlash or metal shavings or anything.


Little bit of water when i drained the oil.


Isn't there a seal that likes to come out over here or is that on the other side? Anyways off to search/read

Thanks

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04 Jul 2020 05:58 04 Jul 2020 06:04 by 2fishkev. Reason: PS
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The longest AT1 build ever (probably) 1st time enduro owner! #10
Looks like you’re doing a good job so far. I think I’d take the clutch pack apart and do the maintenance there since you’ve got it apart this far. Make sure everything is in spec, etc.
it took me 6 years to redo my first bike, a Dt125a. Lots of reading here and stop when I wasn’t sure about how to go about things. Ran out of parts money a few times too. Good luck.
PS. It is DEET that does oil pumps among other things. Nice work and a great piece of mind when you hook it back up!

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