1974 Yamaha 125 Enduro will not start has no power

SOURCE: Yamaha motorcycle stiff clutch

Disconnect the cable at the engine. Does the cable move freely when disconnected? If it does, remove the left side cover then check the operation of the clutch arm. Does it move freely and spring back freely? If not then clean it up. If it does move freely, remove the clutch push rod from the center case. Roll it on a flat surface. Does it roll smoothly or does it sort of lope along. If bent, replace it. If rolling smoothly then put it back in the center-case and remount the side casing. Lube the clutch cable and remount it also. The adjuster #23 should be screwed in until it is snug then back off the screw 1/4 turn.

Assuming no one has tinkered with the actual clutch and it was operating properly a few months ago or when it was put up for the winter, now is the time for an oil change. Dirty, gritty oil can stiffen a clutch big time. Drain the oil and refill with 10w40 motor oil. No synthetics or oils with "special" additives or friction reducers. No oil marked ECII. Just normal motor oil. Shell, Mobil, Pennzoil, etc., the major brands. Ride the bike for an hour or so then change the oil again. Doing this will flush most all of the grit from the gearbox. Hey, oil ain't that expensive. This should take care of the problem.

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SOURCE: what is the oil to fuel mix ratio for a 1974

I seem to remember that they were oil injection, and had a tank seperate for oil, but...32:1 will work if it's pre-mix, just jet the carburator to match that and you will be fine.

SOURCE: i was given a yamaha 125 enduro im guessing about

I am well familiar with your bike. The big problem is getting repair parts. All in all, the bike is probably not worth messing with. Grab the flywheel and lift up and down then left and right. If it is not rock solid the crank bearings are bad, and the crank seals also. Do you know if it will shift properly? Bent shift forks are not a good thing. Either of these will cost about $700 to fix, IF you can find the parts AND if you can find someone who is willing to do the work without access to a service manual. Generally, dealers will not work on a bike over 10 years old. Gas tank rusted inside? Battery shot? Does the clutch operate properly? I will bet it needs a new chain.

You will put a lot of time, effort and money into the bike. When you are through you can sell it for around $300 if you are lucky. Sorry to mess up the celebration. That's why you got it for free.

In any event, Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part and/or the notation "Not Available" is in the description, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

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SOURCE: I need 1974 Yamaha DT 250 enduro Parts Diagram and

GDay mate

Took a bit of scrounging bout the net, but I eventually found it!!

You can look at the parts diagram/part numbers for the old girl here

A rating and feedback is a great way to reward me for my efforts to find this for you. Cheers mate!!

regards
robotoek

SOURCE: Hello- I need a headlight for 1974 yamaha dt 360.

JP cycles has them for $18 .Make sure you get the 5 3/4 inch seal beam. OEM yamaha are very hard to find and very expensive. google JP Cycles