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Old 06-15-2005, 07:10 AM
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1972 Yamaha 250

well I just had a 1972 yamaha 250 torque induction motocycle given to me, It doesn't run, It has no spark I'm leaning towards the points but ? any ideas, I want to get it running and drive it around on the 4 wheeler trails.

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Old 06-15-2005, 10:51 AM
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Have you checked the points?
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Old 06-15-2005, 11:05 AM
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i have a simple text file on getting a old scooter running want it?

i dont know where i came from but credit is due.


points could ve rusted. gap should be about a macoronni box(.016"). spark plug like .025". check fuses , and ignition wires. sometimes the battery doesnt even have to be good. it just needs to be in place to complete the circuit. check the spark plug wire ohm it out for resistance. and the coil too.
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File Type: txt mopedfixes.txt (27.1 KB, 147 views)

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Old 06-15-2005, 11:18 AM
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well I actually dont have it yet but i'm getting it tomorrow night. I was looking around on the internet and a site that I found said that it was a 2 stroke but I dont know, that'd be cool if it was.
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Old 06-15-2005, 10:50 PM
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Quote:
Originally Posted by Silentlion_69
well I actually dont have it yet but i'm getting it tomorrow night. I was looking around on the internet and a site that I found said that it was a 2 stroke but I dont know, that'd be cool if it was.
Yes the 1972 Yamaha 250 torque induction is a 2 stroke, A 2 stroke power motorcycle are lots of fun to ride!! Specially once you learn where the power band is and stay in it!!!! Get it running and have a blast with it
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Old 06-16-2005, 11:24 AM
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It looks like a 4 stroke though, there is an oil tank thing that runs into the basin, or at least it looks that way. I dont know I still aint gone and got it yet, How do you think it'll go with a dirtbike tire on the back.
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Old 06-16-2005, 11:42 AM
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Not all 2-strokes require you to mix the oil in the gas. A lot of them already had their separate oil tank that you just filled up and it would self lubricate itself that way.

Congrats on the score!



Mike
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Old 06-16-2005, 12:06 PM
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I know they have oil inject d 2 stroke engines, My snowmobile is. It should be pretty fun once I get it goin
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Old 06-16-2005, 03:02 PM
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I believe yamahas first four strokes were the XS650's I believe were introduced somewhere around 1975-76 and it looked very much like a Triumph 650. I do not believe Yamaha ever had an oil tank for their 4 strokes as they were all wet sumps. Honda's early 1969-1978 SOHC's were the only Japanese bike that had dry sumps as far as I know and yes they had an oil tank. Post a pic when you get it. A 1972 250 Yamaha is a 2 stroke. Check out this web site, it list all yamaha's built since 1970, http://www.bikez.com/brand/yamaha_motorcycles.php

If you put a dirt tire on this Yamaha stay on the dirt, Dirt tires suck on the street, they don't handle well at all on the street if you ride it like a street bike should be ridden.

Last edited by gcrmcc; 06-16-2005 at 03:08 PM.
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Old 06-16-2005, 06:34 PM
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No but riding a dirbike with some sticky meats on the street is a boatload of fun, and tickets, waiting to happen.

Larry
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Old 06-16-2005, 06:44 PM
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To get spark, the magnets in the magneto probably just are rusty and need cleaning.
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Old 06-16-2005, 07:18 PM
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You didn't say weather this motorcycle is a dirt bike or not. If it is a street bike, the exhaust will be real low, and hit the ground real easy. I bought a Yamaha RD350A when it was a year old, and I believe it was a 1973 or 74 model. It was in fact a 2 stroke, oil injected motor. I believe the redline on it was about 10,000. I was told that before the Kawasaki 900 came out, it was the fastest bike on the road. I do know for a fact that it would keep up with a stock 900 from a stop to 105 MPH. At that speed, the bike was too light, and was scarry to ride, as any small breeze would move you over several lanes real quick. The carbs on them were operated by moving slides up and down, and the oil was drawn in thru rubber tubes to mix with the gas. They had a problem with the slides sticking up from anything getting in them thru the filter. That would make the throttle stick wide open. That is a real scare when you have a bike that will raise the front wheel in all 6 gears.

The 250 will be lighter, and have less power, but will likely, when running right, still give you a thrill.
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Old 06-17-2005, 06:24 AM
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yes it is a motorcycle, i know where there is a pic of one that looks the same, I'll put it up here when I get a chance.
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Old 06-17-2005, 06:42 AM
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here it is







thats not my bike but it looks like it, everythings the same except my bike doesn't have that rack thing on back
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Old 06-17-2005, 07:10 AM
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heres a pic without the rack















does anyone know of any good sites where I can find some info on these bikes, My cousin still wont believe me that it is a 2 stroke, he thinks its a 4 stroke just because it has flanges on the cylinder head like most four strokes do.
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