tallyram

iTrader: (11)

i need to know what the "acceptable" measurement is on the mr ninja's crank pin.

22Racer

iTrader: (67)

They should be around .1965 or so, I would consider it junk if it's under .194 or less. They are one of the best wearing cranks I've worked on.

Rex

tallyram

iTrader: (11)

hey, i really appreciate the help! this one is from .1965-.1970, so i guess i'm good to go. it has about 5.5 gallons on it and all is original except for tko bearings. gonna freshen her up with a new p/s, rod, wrist pin, and clips! these are some extremely reliable engines! once you figure out how to tune them you can have fun racing and not worrying about messing with them.

22Racer

iTrader: (67)

Dont' waste your money on a new piston and sleeve. I can pinch it for you, you will probably get another 5 gallons on it for only $15.00 and not have to waste time breaking it in.

Rex

plus2ss

iTrader: (1)

Good luck finding a conrod for a mr21. ive been looking and it seems to be out of stock everywhere. If you do find a company that has them in stock, let me know.

token

http://metrolinalxa.com/carolinasrc/...idproduct=2182

I order on a couple weeks ago, they have them in stock

tallyram

iTrader: (11)

a couple of summers ago i bought both .21s and parts to rebuild them. i have all the parts that i need minus a new carb.

plus2ss

iTrader: (1)

Does anyone know if the mr21 rod works in the GRP .21?

token

no it does not

Timmo

iTrader: (16)

Aren't they both GRP based engines.

token

Yes they are but they are not the same engine cut from the same shell. Look at all the manufactors and how many engines they make with different parts.

22Racer

iTrader: (67)

I thought a friend of ours put Grp rods in his Grp Ninja's but I personally haven't.

Rex

Timmo

iTrader: (16)

Can someone verify this.

plus2ss

iTrader: (1)

Im not 100 percent sure, but a couple of people have said all GRP engines internals are interchangable. I called carolinasrc and they dont have the mr21 rod in stock. It would be worth the try if i could find one.

token

No they will not - the GRP ROD is about 2mm shorter than the MR rod - I just pulled the rod out of bother engines and compared - they are two different rods