In reply to 44Dwarf:
That is 2 quarts of straight Pine Sol. It stinks like bats in a turpentine distillery, or so I imagine. I am going to let it soak some more. I am curious to find out if the slide will free up. Also I am going to check the jetting on it, so I have an idea of how to jet the new carb.
I would get a new carb, that's pretty corroded. And having a bike that starts easy, and doesn't run lean somewhere in the RPM range is nice.
Update: The carb is junk, a new one is on the way. All of the seals and gaskets are finally here. I will begin work sunday, after I return home from a business trip.
When you get the new carb see what needle is in it v/s what needle is called for on the OEM unit. toss stock jetting at it but check at different throttle inputs to see what the plug looks like as needle tapper will be different.
I've had good luck using a GUNSON "Color Tune" in a dark garage. Check Se7en ent for it.
Update: The machine is in my heated shop(house). The engine is ready to split and the frame is cleaned up. I am trying to decide if I should paint the frame or leave it original.
I can get away with this because no one lives with me.
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This is coming apart this evening.
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I am hoping that a scotchbrite will clean this up.
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Glad to see some progress. I guess you were serious that you wern't going to touch the race car till you finished some other projects.
Chris
Nice find! If you are thinking to Scotchbrite the cylinder bore, I'd advise against it. Scotchbrite is pretty aggressive. Borrow a flex hone:
and run it through just enough to get the glaze off. If it's going to be a while before you put the cylinder back on, smear grease on the inside of the bore with a rag to prevent rust.
IIRC on those you have to split the cases to get to the left side crank seal, so even if it looks okay it's a good idea to replace it.
In reply to Curmudgeon:
Thanks for the tip, I will search for a hone today. The cases will be split when I find my snap ring pliers. I have a complete set of gaskets and seals that I will be replacing.
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Those damned bats did a job on the reed cage.
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Preparing to soak in vinegar
Not positive but check RD 350 street bikes as the reed cage was used in tons of yamahas.
In reply to 44Dwarf:
Good idea, I have two RD's in a spare bedroom. Do you think the pictured cage is junk?
Heck no but if damaged is to much thats where i'd go 1st. Theres loads of infor on how to modify and how not to mod the cage for flow.
I don't know if that reed cage has any aluminum in it...but I wanted to forewarn you (possibly after the fact) that I destroyed a quadrajet carburetor body one time by soaking it in vinegar. It came out all pitted everywhere...
So...my anectdotal evidence suggests not soaking aluminum in vinegar.
I've had great luck restoring rusty steel hardware with Vinegar, however.
Clem
No pictures to add today, I left the camera at home. The reed cage cleaned up beautifully in the vinegar. I have inventoried my parts. I need a front sprocket, a chain, a throttle cable and a clutch cable.
I have the wheels off. The front wheel has a small crack ,3/8"-1/2" long starting at the tire bead. The hub is in great shape. I have extra wheels with excellent rims and fair hubs. I have replaced spokes in the past but I have never laced up an entire wheel. Do I need to buy a new set of spokes or can I pick and choose from my collection? Do I need anything more than a spoke wrench?
I appreciate all advice and comments,
Thank you
Braden
It looks like you have everything important, but just in case, a good place to find parts is vintagemx.us
I raced motocross when I was a teen, then moved on to other things until I got back into it full bore 30 years later. My last bike before I quit was a 78 YZ125 that I paid for with a summer job. I remember that bike being perfect in just about every way.
Good luck with your project. What are your plans when it's all done? I hope you're going to race it.
Lasing up a whole rim is well a pain in the ass very doable but not quick. You have to worry about run out in all directions. At least its the front so there is likely no rim offset like some rears. If i was going to swap rims I'd by a complete spoke kit. theres a guy from Thailand on e-bay who does NOS Yamaha parts he has loads of spoke kits and the quality is there too he's claim is old dealer inventory but.....wow he's got stock....make me wonder but never been let down.
Youl' need a axle and dial indicator or three to get it right.
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