MF 65 throttle spring

[fatb]

Bought a new to me 65 and and i dont see any spring on bottom of throttle shaft? anyone know where you can buy the spring? Its item 11 in the parts diagram.

Anyone have any pics of throttle linkage?

 

[WranglerX]

Have you tries local hardware store... Probably cost you $3...

Dale

 

[fatb]

No not yet would you know what size it is must be like 2 incher?

 

[fatb]

also need the size and tension in lbs? if anyone knows?

 

[ovrszd]

Welcome to TBN.

I believe you are overthinking this. Get a good measurement for length and go shopping. I'd start with a soft spring and work my way up.

What exactly does this spring do?

 

[fatb]

its a the balance spring on bottom of throttle shaft it attaches to a curved arm on one end and the balance bracket on the other, I guess must keep tension on the throttle handle

 

[WranglerX]

its a the balance spring on bottom of throttle shaft it attaches to a curved arm on one end and the balance bracket on the other, I guess must keep tension on the throttle handle

Does the throttle work without spring now?

Dale

 

[fatb]

you need to hold it down to increase rpm, if you take your hand off it goes back to idle

 

[ovrszd]

Best I can tell from your pic, parts 4 and 7 combine to hold the throttle in place. 4 are fiber discs that work like brake pads or clutch discs. 7 applies pressure and is adjustable using the bolts that hold the stack together. I think if you tighten the bolts and pressurize the stack, the throttle will staywhere you leave it.

The spring might hold tension on the carb linkage assembly. But don't think it has anything to do with position control of the lever.

 

[fatb]

ok got a couple of carb springs from o'rielly's will see if they work. Also bought some cork from walmarts for new friction disks if needed. Thanks for the explanation

 

[ovrszd]

Your welcome. Hope it works out for you. Give us a follow up.

 

[fatb]

Added the spring and now it actually will idle were it is suppose to and I can set the rpm with the handle pretty well now.

 

[fatb]

seems like I have to pull up on the throttle handle to get to work but it seems to stay. Must be an clamp or screw to tighten around throttle shaft to remain in pulled up position.

 

[ovrszd]

You're gaining!!!! Look at all the things you are learning at the same time!!!!

 

[fatb]

Yes put a new tach cable on and tach came to life but sometimes it acts like there is no cable on. Maybe I don't have enough lube on ends or maybe i tightened up too much?

 

[ovrszd]

I don't think it's too tight. Should have been a square drive cable inside the sheath. It aligns with square receivers on each end. Pretty hard to assemble this wrong. May be that the gauge is sticking. Use it awhile and see if it improves. Next step would be to disassemble the gauge and clean it. Very delicate. Easy to ruin to the gauge.

 

[fatb]

ok maybe put some lube on it?

 

[ovrszd]

I don't think that would help.

Unhook the cable at the engine end. Chuck a drill onto the cable end. Gently turn it while watching the gauge. Confirm you are turning it the right direction. Slowly increase speed watching gauge. Stop start. Stop start. Change speed. Stop start. See if it ever fails. If it does, now you know the problem is at the gauge end. If you can't make it fail, now you know the problem is at the drive end.

 

[fatb]

Put a little moly lube on the end and it worked good all day. Funny it takes a while to get going, seems to be working fine now

 

[ovrszd]

Awesome. Glad it worked out.