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Tractor Talk Discussion Forum

not a tractor question

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Dan Luers

09-06-2005 21:55:11




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Sorry that this isn't a tractor related question, but you guys and gals have always been so good with your advice. I've got a 1977 Yamaha 125 motorcycle that I used to check cattle with on our farm when I was growing up. It hasn't ran for about 10 years, and for fun I'm going to get it going again. It has the small bottle for outboard type oil to be injected instead of mixed with gas. I've got that covered. The question is, what type of oil do you put in the crankcase. 30 wt?
Thanks
DJL

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dr.sportster

09-07-2005 13:14:46




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 Re: not a tractor question in reply to Dan Luers, 09-06-2005 21:55:11  
Sorry I did not read the question carefully.My book covers from 66-69 models and no oil wt is given just capacity.I beleive you mean tranny oil.DT-1 is 1.7 quarts with later years being alot less capacity.Is this a DT or an IT[blue fenders].I will have to make a phone call to find out if you can post the model here.



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dr.sportster

09-07-2005 12:44:42




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 Re: not a tractor question in reply to Dan Luers, 09-06-2005 21:55:11  
Just go to a jap bike shop and buy Yamalube 2 stroke oil.Then you have the oil the manufacturer wants.The stroke of the pump is adjustable by adding or removing washers under a nut.but should be right if it was when it went into storage.In on the road emergencies it was ok to use 4 stroke car oil untill you got back home.Pump is operated with the throttle cable.Lube up those old cables with Yamalube chain and cable lube[contains moly]Good stuff.Never let that tank go dry or motor seizure will definatly occur.

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Bob - MI

09-07-2005 10:23:34




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 Re: not a tractor question in reply to Dan Luers, 09-06-2005 21:55:11  
There is crankcase oil used for the transmission and the clutch. This is a seperate system from the lube that gets to the piston/rod/crank. 10W30 would probably be ok but to be safe call your Yamaha dealer. So far as the oil injection system, you should find 2-stroke oil that is good for air-cooled injected systems. Your Yamaha dealer would be able to help there too. For start-up I agree that some pre-mix in the tank would be good insurance. You may want to drain all the injector oil that"s in the tank first before you get going on this. Chances are the oil is gummy and won"t do you much good. I would not use chain saw oil as this is generally thinned out to aid in mixing with gas. Oil injection is more direct and a reduction in viscosity could ruin your motor.

Dan, most Yamaha dealers would still be familiar with that bike. They were very popular in their day and the fact that there"s still a lot of them running means that they are still servicing them to some extent.

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Maark

09-07-2005 09:18:05




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 Re: not a tractor question in reply to Dan Luers, 09-06-2005 21:55:11  
If you're not sure if the injection unit is going to work after all these years of sittin, you can mix the 2-stroke oil in the gas to start with.



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buickanddeere

09-07-2005 08:44:42




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 Re: not a tractor question in reply to Dan Luers, 09-06-2005 21:55:11  
Oil intended for chain saw usage. Warm weasther and a hot running aircooled engine. Not outboard oil which is blended for warm weather but "cool" running water cooled engines. Not snowmobile oil intended for use in the dead of winter. The trans oil has to be wet clutch compatable. My sistor had one of those bikes.



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Davis in SC

09-06-2005 22:15:09




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 Re: not a tractor question in reply to Dan Luers, 09-06-2005 21:55:11  
I re-Read question... there is no crankcase oil used on 2-stroke bikes. There is oil for the transmission. In the transmission, I used to use 30 weight... I bet, by now that companies such as BelRay have special oils for transmissions. Might be worth stopping by a motorcycle shop to check.



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Joe(TX)

09-07-2005 05:09:46




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 Re: not a tractor question in reply to Davis in SC, 09-06-2005 22:15:09  
It does have crankcase oil. The crank bearings need oil too. I use standard engine oil.



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onefarmer

09-07-2005 07:14:29




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 Re: not a tractor question in reply to Joe(TX), 09-07-2005 05:09:46  
There is no way there is crankcase oil fo this machine. It gets lubed from the two cycle oil that is mixed automaticly from the small tank. There is a separate pump for this. The "crankcase oil" mentioned here is for the trans. I belive on this machine there is a dipstick near the kick starter. This is for the trans. I would use 30wt oil here.



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ebbsspeed

09-07-2005 06:45:47




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 Re: not a tractor question in reply to Joe(TX), 09-07-2005 05:09:46  
Joe, it's an odd 2-stroke motorcycle if it's got oil in the crankcase. I don't know of any that do, but I've been wrong before. Most two-strokes use the crankcase as a chamber to force the air/fuel/oil mix into the combustion chamber when transfer ports in the cylinder are uncovered by the moving piston. It is the atomized oil in this mixture that lubricates the crank bearings.



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Davis In SC

09-06-2005 22:07:48




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 Re: not a tractor question in reply to Dan Luers, 09-06-2005 21:55:11  
Any modern 2-stroke oil... Much better than oils sold when that bike was built. Just make sure oil is flowing before you start it. Might be a good idea to use pre-mix for the first tank full, & check to make sure oil tank level gets lower. You will get some extra smoke, & might foul a plug, but better than seizing a piston... Enjoy that bike, I miss all the ones I had as a teen...



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Mike form cny

09-07-2005 20:10:28




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 Re: not a tractor question in reply to Davis In SC, 09-06-2005 22:07:48  
In the tank any 2 stroke oil rated for air cooled and oil injection should work, I like yamalube or amsoil

In the gearbox, They call for straight 30 weight or I like to run ATF in all my 2 stroke toys. Its cheap, thin and has always served me very well, I just change it often



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