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Old 04-18-2009, 07:09 PM   #1
blankenship OP
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disastrous '71 yamaha CT1 restore? oh no?

a good friend's elderly father gave me his old '71 yamaha ct1 175 enduro a few months ago, as it had been collecting dust since 1976!

i cleaned the carb and put a put in a keyster kit, sealed the tank, replaced all the corroded gaskets, added new bel-ray oil in the injector, and she fired up today! when the smoke cleared, she seemed to be running darned good...though only with the idle/air screw screwed all the way in.

i warmed her up, drove around the block a few times, and was having a quite a blast...then suddenly...SMOKE...tons of it...billowing gray out of the tail of the pipe and the pipe/engine connection.

she died, and though i was able to restart her, she smoked like crazy and runs like crap. the plug was pretty fouled...but a new plug didn't make a difference.

ps: i hadn't changed the transmission gear oil yet..i was waiting til i got her warmed up.
ps2: i didn't test the oil injector first.
ps3: my girlfriend claims to have heard a "squeal" come from the bike before it started smokin'.

what happened?
now what?
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Old 04-18-2009, 07:39 PM   #2
ruh roh
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Does the kickstart still move the piston?

edit, I see still it started back up. I'M guessing rings broke or valves stuck.
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ruh roh screwed with this post 04-18-2009 at 07:45 PM
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Old 04-18-2009, 08:00 PM   #3
Strong Bad
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Valves stuck on a CT-1??? Come on man its a 2 stroke.

My bet is you lost the main seal on the clutch side of the crank. It's sucking tranny oil into the crankcase.
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Old 04-18-2009, 08:01 PM   #4
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Sounds like crank shaft seals to me, letting gearbox oil into the engine, and letting crank case compression out.
Whatever the cause, it sounds to me like a full pull down is indicated.
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Old 04-18-2009, 08:58 PM   #5
blankenship OP
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how to

crankshaft seals, eh?
are those the "oil seals" (parts number 14 and 17 on this shematic) : http://www.bikebandit.com/assets/sch.../YA4256_02.gif ?
can they be repaired without removing the motor from the bike?
anybody know if there's a test i should do first, and/or if there's a "how to" thread anywhere on the forum? (i've searched, but didn't have much luck).
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Old 04-18-2009, 09:52 PM   #6
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Quote:
Originally Posted by Andy-Gadget
Sounds like crank shaft seals to me, letting gearbox oil into the engine, and letting crank case compression out.
Whatever the cause, it sounds to me like a full pull down is indicated.
+1
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Old 04-19-2009, 04:24 PM   #7
stainlesscycle
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Quote:
Originally Posted by blankenship
can they be repaired without removing the motor from the bike?

hah! nope! pull motor, tear it apart. replace crank bearings and seals.
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Old 04-20-2009, 08:22 AM   #8
wolvertone
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If you didn't check the oil injector, the oils is most likely "gelled" up and you could have ran it without oil and scored the cylinders.

Have you done a compression check?
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Old 04-20-2009, 04:49 PM   #9
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Quote:
Originally Posted by wolvertone
If you didn't check the oil injector, the oils is most likely "gelled" up and you could have ran it without oil and scored the cylinders.

Have you done a compression check?
Wow!!! That's number two for this thread. Do you guys just type random stuff and hope that something you've said might apply?
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Old 04-20-2009, 06:57 PM   #10
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Quote:
Originally Posted by Strong Bad
Wow!!! That's number two for this thread. Do you guys just type random stuff and hope that something you've said might apply?
This is the forum to learn and talk motorcycles. Why don't you explain the fault in his logic instead of being a jerk ?

If you want to be an asshole, Jo Mama is a more appropriate venue.
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Old 04-20-2009, 08:22 PM   #11
Strong Bad
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Quote:
Originally Posted by Cat Daddy
This is the forum to learn and talk motorcycles. Why don't you explain the fault in his logic instead of being a jerk ?

If you want to be an asshole, Jo Mama is a more appropriate venue.
Of course it is a great place to learn about bikes and to talk about them too but are these people reading what the OP said??? And gee..... I did tone it down. I didn't call anyone a F'n idiot. Or unlike you, I didn't call anyone an asshole. I wasn't going to go into exactly how off his post was but since you asked, let's look at some of what is being passed off as knowledge here.

OK, the first guy was talking about valves. On a CT1..... Duh. The second guy is talking about...wait a minuet... how many barrels does a CT1 have? Oh yeah that's right only one. Maybe it's the second one that has those mysterious valves in it??? Also if your are burning so much oil it's "billowing" out the pipe and fouling plugs, it is highly unlikely that a lack of oil has caused scoring to the cylinder(s) sic. AND even if you did have a scored barrel all the blow-by in the world isn't going to cause it to smoke because there is no oil in the crankcase, geeze it's still a 2 stroke! Or maybe 2 strokes are too complex for you sensitive types???

It would be much better to have had no responses than out of the ball park wrong ones.
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Old 04-21-2009, 03:24 AM   #12
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Well, I will stand by my words that you were being an asshole in that post.

But, your reply does illuminate the logic or lack thereof in his resonse. I'm watching this thread closely because I too have a CT 1 175. It's a one owner, bought new by my mother in law, and it has 800 miles on it. I've been collecting parts here and there for a complete resto in the future.

I appreciate your second post explaining the faulty logic.
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Old 04-21-2009, 03:53 AM   #13
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It is possible for the oil injector to be at fault,especially on a bike that old. I always disconnected them and ran premix when I was riding enduros (too many years ago to count) LOL
My guess is also the crank shaft seals, these have been sitting for a long time and rubber does get hard with age. Replace them and also check the cylinder walls for scoring, a set of rings and quick hone should fix that up quite easily if that is the case.
Good luck with the project!
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Old 04-21-2009, 01:46 PM   #14
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I've noticed oil two stroke oil gets super runny. Might want to rotate the injector by hand and make sure whats coming out of the schnozzle is what you've put in the tank.
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Old 04-21-2009, 06:38 PM   #15
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If it's like my MX360, you can remove the right sidecover, clutch and primary drive gear, and get access to the drive side seal. You should be able to pry it out and replace it with a new one. Might as well do the generator side, too, while you're at it.
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