need help please- crankshaft

Im talking about the plain bearing that goes on the case. When i install the new ones, i have to just tap? Sorry i dont understood well. Some english its for me difficult even with the translator

They are half shells. They should come out easy with your fingers.
Steve

Since you have the crank shaft out, I have lightly polished many discolored and slightly scored crankshaft journals with fine crocus cloth, then I installed new, standard bearing half shells.
Never had any issues with non raced engines after doing this.
Street engines are very forgiving.

shamal wrote: thanks martin, thanks Steve..

in this page: gpzweb.s3-website-us-east-1.amazonaws.co...KZZXZR550500400.html

i found this :

The KZ550D and KZ550H gpz motors are specified to have 10:1 compression and use piston part number 13001-1127.
KZ550A (standard), KZ550C (chainLTD), KZ550M (shaftLTD), KZ550F (Spectre/shaftLTD) and ZR550B (Zephyr) are specified to have 9.5:1 compression and use piston part number 13001-1121.
The Kz550A1/A2, and C1/C2, don't actually have a part number listed for the standard size piston, but do list the double over-size LL piston which is 1.00 mm (.040") over size, and has part number 13027-1053. That same part number is also used on the Kz550A3,A4,C3,C4,F1,F2, and M1, along with the Zr550B1-B4. So it is assumed the A1/A2 and C1/C2 use standard piston 13001-1121 as well.
The ZX550A motor is specified to have 10:1 compression and uses piston part number 13001-1166.
All of the 550 motors mentioned use the same crankshaft (13031-1014).
All of the 550 motors mentioned use the same connecting rods (13251-1004-JJ), but the ZR550B uses a supersede part number 13251-1004-EE.
KZ550 A3/A4, C3/C4, M, F, D, and H all have the same valves, as do the ZX550A and ZR550B.
KZ550 A1/A2 and C1/C2 have different part numbers listed for valves.
All of the 550 motors, (along with the 650, 750 and many more) use the same buckets (12032-1001) which are nominally 33mm OD. I actually measured 1.2980 inch OD on a couple examples, near the middle, and at 90 degree apart diameters.

i think it will fit.. :dry:

That is my website. Notice I don't mention the KZ550B since I have no info on it. But I would be shocked if the KZ550B had a different crank. So I would try it.

yesss!! i bought today the crank , with hs own bearings too.
when i got it, i will show you all! thanks my friends
your website is one the most useful thing in the world!