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TOPIC: Yamaha ct3 1973

Yamaha ct3 1973 02 Aug 2019 17:56 #1

  • L_Caldera
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Hey everyone,
New motorcycle owner. I have a Yamaha ct3 1973. Top end just blew. I was wondering if anyone know of anywhere I can find one. Or if I can possibly replace with a different type of engine

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Yamaha ct3 1973 02 Aug 2019 19:09 #2

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You'll run into engine mount problems with anything but the same shape 125/175. you can see in the two links below that the motor mont at to lower rear are quite different & other two might not line up either. Is your beyond economical repair?--we love pics --even motor blow up pics, & i'm an expert at blowing things up lol.
www.partzilla.com/catalog/yamaha/motorcy...3/crankcase-cylinder
www.partzilla.com/catalog/yamaha/motorcy...3/crankcase-cylinder
Oh, & welcome!!.
Just to edit yet again--if you've blown a hole in the piston from either a way too hot plug for how hard you were running it--or a few other possible causes--then your going to have alloy from the hole fair splattered down the bottom. I;ve got away with things like that with a good was out but then again you can end up washing stuff into the crank bearings rather than out. I've filled the case full of petrol & spun it over a bit with conrod held up with a stretchy cord, then flipped the bike upside down & even put the garden hose in while upside down--anything to try & get it out. But it also gets into the slot in the conrod if you have that type of rod & if it gets right in it'll make the rollers skid & then it fails. If you can see any little limps in the rod oiling slot the try to hook it out with--something sharp & hooked. Sorry to scare the hell out of you but that's the way it is.--been there done that, more than once.
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Yamaha ct3 1973 02 Aug 2019 23:37 #3

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Welcome from the UK.

When you say top end, I assume you mean something piston/barrel/head related? If so, there should be replacements available on the internet - hopefully just a re-bore, new piston and rings and maybe top end bearings.
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Yamaha ct3 1973 07 Oct 2019 13:14 #4

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Hey Yall,
Got this problem fixed up. A friend of the family said hed take a look and was able to get this fixed relatively cheap.
Ive now run into a new problem that ive searched for solutions but cant find anything too precise. I was replacing my shift shaft oil seal and cleaning the surrounding area which was covered with oil and gravel. When i replaced all parts accordingly, i was not able to shift at all. Seems like the bike is staying in neutral and the shifter is just moving up and down freely not find any gears. Please reply with you solutions. Also attached some recent pictures of said bike. Thanks for the initial replies, glad to be apart of the enduro community.
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Yamaha ct3 1973 07 Oct 2019 16:48 #5

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You'll need to pull the clutch cover and put the shift actuator back on the drum... happens if shaft gets pushed in a little too far.
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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

Yamaha ct3 1973 09 Oct 2019 02:40 #6

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As MarkT says, but just thinking if ya feeling lucky? you could slide the gear lever on carefully then bolt it up & pull hard towards yourself while moving lever up & down, Sometimes you can trick the claw arm into jumping back over the top & into place on the pins. If the return spring has got off the peg then ya stuffed sorry to say.
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Yamaha ct3 1973 09 Oct 2019 02:43 #7

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Yamaha ct3 1973 09 Oct 2019 02:58 #8

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One more thing, regardless of it you go in via the clutch cover or "luck In" doing as i suggested above--please get the washer & circlip in place before tapping the gear lever onto the splines.--well they have to go on first anyway but!! Also i hope the circlip groove doesn't flick the spring off the seal while coming back through the seal if it went through that far. Full of joy aren't i lol.
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Yamaha ct3 1973 09 Oct 2019 14:53 #9

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Thanks guys! I got it back on the drum but I don't think it's on properly
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Yamaha ct3 1973 09 Oct 2019 17:13 #10

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Looks fine.

Roll the bike while trying to shift it. Trans does not like to shift without shafts spinning.
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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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