250r questions

[wwclea01]

I just got a 250r this weekend that needs a top end rebuild. The guy that I got it from didnt even know what to mix it to, I guess that is why it needs a rebuild. The gas tank says to mix it 20 to 1 but I think that is rich. It will be bored 1 mm over stock. Does anyone know what I should mix the gas at. Also I was wondering what the torque specs are on the head. There is no point in buying a $30 manual just to see what the torque specs are.

[310Rduner]

Most people mix at 32:1.

The tank only says 20:1 because of the poor technology of oils in the 80's thats what they needed to run on, todays better technology means it should be mixed 32:1, or leaner for some oils.

[310Rduner]

Oh, and the clymer manuals are a must have, it will become your bible.

[kwatts400]

I mix one small bottle of mc-1 to five gallons of gas, I think it is something like 50:1. Get the Clymer, its money well spent.

[wilkin250r]

Originally posted by kwatts400
I mix one small bottle of mc-1 to five gallons of gas, I think it is something like 50:1. Get the Clymer, its money well spent.

Most likely it's a 16oz bottle, this will give you a 40:1 mix.

Here's the formula. There are 128oz in 1 gallon, so 5 gallons has 640oz. So you are mixing 640oz gas to 16oz oil.

640/16=40. So you're mixing 40:1 40oz of gas to every 1oz of oil.

Almost everybody I know runs 32:1, but you're probably safe with 40:1.

32:1 is the easiest to mix, just remeber 20 OZ to 5 gallons.

or 10 oz to 2.5 gallons

duner is right, the manual is the bible.

but if You think your smarter then the bible.

here you go all the specs you need......

I just hope you dont mix up torque specs



Head: 17 to 21 ft.-lb. tighten in criss cross pattern
cyl base: 27 to 35 ft.-lb.
Alt Rotor: 47 to 54 ft.-lb.
Primary drive gear bolt: 29 to 36 ft.-lb.
Drive sprocket nut: 22 to 25 ft.-lb.
Clutch lock nut: 40 to 47 ft.-lb.
Shift drum center bolt: 14 to 17 ft.-lb.

[wwclea01]

thanks bee rock. I am just rebuilding the top end. SO I didnt see any point in buying it for that right now. kinda tight for money as of this moment.