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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - Help with Yamaha Mini bike (enduro??) JT1? 1st bike for me!


Help with Yamaha Mini bike (enduro??) JT1? 1st bike for me!

 
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m3beemer16
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PostPosted: Mon Apr 21, 2008 2:00 am    Post subject: Help with Yamaha Mini bike (enduro??) JT1? 1st bike for me! Reply with quote

I am new to Bikes/motorcycles/etc.

I bought a Yamaha mini bike at a yardsale and was wondering where i can get some info on it. I can find anything that matches when I do a google search. Sorry, if this is the wrong forum for this type of bike. If so, can someone direct me to a forum that would be able to answer my questions.

The engine code is JT1-012736

1.) What type of bike is this? I was told its a mini enduro...
2.) ANyone know how many CC this motor is? I was told 90cc, I dont think so. What did they make these bikes in?
3) what should I do to tune it up? What type of oil do I need to use to change out the crankcase?
4.) Can this be modded?

Thanks





its a 2 stroke.

Anyone know year it may be? and how much is it worth?

Tonight I took off all the stickers and am planning on painting it flat black. Any input is greatly appreciated! I am looking into maybe getting some parts for it as well.

Also, I noticed the shifting is different then many other bikes.. Again I am new I actually have never riden a bike/motorcycle before. It was pretty easy from trial an error. Is this the shift pattern? All the way up=Nuetral. Down 1=1st gear, Down2=2nd, etc..

I was told most bikes you step all the way down to get to first then half up to neutral. So far this lil bike has been really fun.

Also, someone had disconnected the Auto Oil injector. I am guessing I need to now mix my gas/oil manually. What is the recommended ratio? Any specific type of oil? My friend gave me some 2-stroke oil that I think should work. Regular 87octane ok??

Sorry for all the newbie questions. I've always wanted a little bike like this and its been pretty exciting so far
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Steve Searles
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Location: Marshall, MI

PostPosted: Mon Apr 21, 2008 6:38 am    Post subject: JT-1 Reply with quote

Looks like a Yamaha Mini-Enduro JT-1 made from 1971-72. It is 80cc with a rotary carb intake system and oil injection. Mix at 20:1 or so with good 2 stroke oil. Shift pattern was funky on a lot of early Yamahas. The only modifications might be to smooth out the ports alittle taking casting imperfections away. Don't go over board with modifications as it will help very little and reduce reliability. PS: Make sure your exhaust port is clear of all carbon and remove carbon from head and top of piston. Any other questions, just fire away.
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milestogo
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Joined: Mar 24, 2008
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Location: Littleton, CO

PostPosted: Mon Apr 21, 2008 5:04 pm    Post subject: JT1 Reply with quote

Hi Steve,
I'm pretty sure the JT1's were 60cc's. Then the GT1 enduro came out with the 80cc engine. I could be completely off base here, but I think m3beemer16's new ride is a desert orange 60 mini enduro.

From http://www.vintagemotocross.biz/id2.html

1971 MINI ENDURO

JT1 DESERT ORANGE SERIAL # JT1-000101 - 041708
JT1 DESERT ORANGE SERIAL #JT1L-200101 - 201152
W/LIGHTS



Tom
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m3beemer16
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PostPosted: Tue Apr 22, 2008 1:30 am    Post subject: Reply with quote

Thanks for the info and the link! So some of these came with lights and others not. I wonder if I can rig up a headlamp and battery. I am having a lot of fun with this thing! Any secrets to how to clean up the build up in the exhaust? Is Seafoam safe to run on these little motors?
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Steve Searles
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PostPosted: Tue Apr 22, 2008 6:13 am    Post subject: Yamaha Mini Enduros Reply with quote

Yes, there was the GT80 and they made some 60cc machines. Let me do some more digging. I enjoy learning about this stuff.
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m3beemer16
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PostPosted: Wed Apr 23, 2008 12:56 am    Post subject: Reply with quote

I am looking to change the fluids. Any ideas to what I need to put in this bike?
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Steve Searles
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PostPosted: Wed Apr 23, 2008 5:33 am    Post subject: Reply with quote

The only "fluids" in that baby is the transmission oil. Just use a good 10W40 and pull the drain plug on the bottom and fill to either xxxmL that is stamped on the case or window level or weep hole. I can explain if needed but all motorcycles are one of those three oil level ways. The only other oil would be the two stroke injection oil and I would recommend YamaLube.
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m3beemer16
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PostPosted: Wed Apr 23, 2008 9:15 pm    Post subject: Reply with quote

thanks for the reply. so 10w40 tranny oil will work? I pulled the dip stick and it looked milky red.

Also, the previous owner had cut the oil injector so I need to manually mix my gas and oil. I need to get a ratio cup
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Steve Searles
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PostPosted: Thu Apr 24, 2008 5:59 am    Post subject: Reply with quote

20:1 golden spectro 1 to 5 gallons of gas. easy
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m3beemer16
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PostPosted: Thu Apr 24, 2008 11:24 pm    Post subject: Reply with quote

I noticed on the petcock. THere is S,0, and R. I know R=reserved but what is off?
R= Reserve
O=On or Off?
S=stop or Start
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Steve Searles
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PostPosted: Fri Apr 25, 2008 6:00 am    Post subject: Reply with quote

Great question. I have never really thought about it but here is my guess. S=stop and O=On especially if S is the middle setting.
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m3beemer16
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PostPosted: Sat Apr 26, 2008 1:38 pm    Post subject: Reply with quote

S- Left
O- Middle
R - Right.

I guess I can start it up switch it from S and O and see what kills the motor right?

Should I premix the Oil and gas? Or can I just Gas in the tank and add the correct amount of oil?
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m3beemer16
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PostPosted: Sun Apr 27, 2008 5:11 pm    Post subject: Reply with quote

is it motor oil or transmission oil? Or are they the same? The fluid in there right now looks red.
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m3beemer16
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PostPosted: Mon Apr 28, 2008 3:35 am    Post subject: Reply with quote

while doing some research I see NOS a lot what does that mean?
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Steve Searles
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PostPosted: Mon Apr 28, 2008 1:56 pm    Post subject: NOS Reply with quote

NOS = New Old Stock These are "supposed" to be actual Original Equipment Manufacturers parts that are left over. Example would be Yamaha parts from 1972.
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