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Old 07-07-2008, 08:17 PM   #1
Vandergraf OP
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1973 Yamaha CT175 Enduro

Just bought a beat up, but rideable Yamaha CT175 which I plan on leaving at the cabin and using to ride easy sandy trails and plonking around the property. I can't find a manual for it and have a couple of concerns.
1. I don't know what kind of oil to put in the gear box. Any ideas?
2. It's got two broken spokes on the rear wheel right next to each other. I'm a 220 lb. old man riding easy sandy trails at slow to medium speeds. No rocks and no jumps will be attempted. Am I relatively safe riding with two broken spokes, at least until I decide to change the rear tire in a season or two?

Any thoughts or advice on this old machine would be appreciated.

Vandergraf screwed with this post 07-07-2008 at 09:00 PM
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Old 07-07-2008, 08:34 PM   #2
Frank Warner
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From memory - engine oil. Note that this also lubes the clutch... it would be the same oil as in the newer bikes and the old DT250 AT125 .. 10w40 ....

I'd get some new spokes and nipples .. you don't want to have the rim warp ... easy job, don't be lazy!
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Old 07-07-2008, 08:46 PM   #3
adaycj
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+2 Fix the spokes. Not that it has anything to do with the manual or recommendations, but I used Mobil1 15w40. Kinda wish I never sold mine.
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Old 07-09-2008, 10:29 PM   #4
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www.yamahaenduro.com for vintage enduro info
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Old 07-10-2008, 02:11 AM   #5
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I had a CT2 175 new in 1972,and also a TY175 which used the same engine this powerplant is still made today in the AG100,one of the longest production runs around.

Yamaha recommend engine oils in their 2 strokes,I'd go for a diesel oil like Delo or others as they have a higher zinc and phosphorus additive package like bike oils.Change it more often than you'd think.They are prone to getting water in the gearbox oil too - my TY175 did when ever it went in water,and every AG100 I saw had water in the gearbox oil too.Keep an eye on the oil pump cable,and if it gives trouble go premix if it doesn't worry you.
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Old 10-06-2009, 05:45 AM   #6
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Suggestions

I am about to start a CT175 rebuild as well. Some suggestions I have been given:

1. Relace the spokes - the nipples will all be rusted and prone to failure
2. Go to pre-mix instead of oil injection to reduce the risk
3. Chrome parts in poor shape could be painted black as was done on vintage Yamaha competition machines to avoid re-chrome expense
4. Crank seals are probably bad so replace those
5. Fuel tank may have rusted inside and plugged the carb. Clean out carb and tank
6. Get parts here: http://216.168.60.165/speedandsportinc/index.tpl
7. Enjoy

Here is my "before" picture:
http://www.advrider.com/forums/showp...1&postcount=18
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Old 10-06-2009, 08:27 PM   #7
concours
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Quote:
Originally Posted by Vandergraf
Just bought a beat up, but rideable Yamaha CT175 which I plan on leaving at the cabin and using to ride easy sandy trails and plonking around the property. I can't find a manual for it and have a couple of concerns.
1. I don't know what kind of oil to put in the gear box. Any ideas?
2. It's got two broken spokes on the rear wheel right next to each other. I'm a 220 lb. old man riding easy sandy trails at slow to medium speeds. No rocks and no jumps will be attempted. Am I relatively safe riding with two broken spokes, at least until I decide to change the rear tire in a season or two?

Any thoughts or advice on this old machine would be appreciated.
10-30 engine oil is what was recommended for the trans. I would NOT go for any synth. or diesel oils, clutch slippage may result. I had a 1973 CT-3 175, and a AT-1 125 and a JT-1 60. Forget the spokes, they'll get worse, eventually. Just look at them once in a while. Sounds like you'll have long periods of non-use, be sure to use Sta-Bil, put the piston up on compression before storing, put steel wool in the end of the exhaust to keep out mice. put screen over the air intake for mice too.
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Old 10-07-2009, 06:00 PM   #8
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CT175 advice

In the middle of one myself
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Old 10-07-2009, 06:01 PM   #9
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Another

#2
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Old 10-07-2009, 06:02 PM   #10
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another

#3

I took it down to the crank and rods.

Should be a sweet little scoot
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Old 10-07-2009, 06:09 PM   #11
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spokes

Get a whole new set. Don't screw with them and land on yer a$$.

New crank seals for sure. It will either blow oil or burn a piston, depending on what side leaks. Maybe none will. Your call. They need crankcase pressure to run right.

The oil injection works fine if it is set up right. Premix is OK if you are nervous about it.

Rebuild the carb and clean it thoroughly. Put an inline filter in the hose then for sure or it will plug up from the crap in the gas tank.

I've done pretty much everything on this one so I can tell you some things about them.

Check the tranny too

Mine had some issues
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Old 10-10-2009, 11:34 AM   #12
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Enduro forum

Quote:
Originally Posted by ADK
www.yamahaenduro.com for vintage enduro info
Might be nice IF you could get onto the site and participate. I've been trying for about 6 weeks and no luck or response from anyone on the site.

Maybe you know somebody that can help out?

Thanks

J
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Old 10-11-2009, 09:23 PM   #13
TwilightZone
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Had one, loved it... many fond memories and miles.
Best mod I did was lace up a 21" rim on the front. If you're going to re-spoke I'd do that on the front for sure.
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Old 10-11-2009, 09:44 PM   #14
welder
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fix the spokes, use the auto lube system if it is still there, they are very reliable,you should use a two stroke transmision oil ine the cases. Its a little spendy but you should not have to change it for a few seasons.
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Old 10-11-2009, 09:54 PM   #15
ADK
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Quote:
Originally Posted by eyedragaknee
Might be nice IF you could get onto the site and participate. I've been trying for about 6 weeks and no luck or response from anyone on the site.

Maybe you know somebody that can help out?

Thanks

J
They're doing some upgrades to stop spammers. try again in a week.
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