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It425

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Posted by: Tom68---------------------

New project, the XR500RB goes for rec' reg' friday and the man that sevices my fire extinguishers seen it and said he had an IT425 that I can have. Typical older bike air cleaner not fitted properly and dusted big time as well as anything not required for forward motion missing. Of course like the XR its a short run model with few parts still available.Anything I should know about and watch out for with this old girl?


Posted by: jsantapau---------------------

the bike should share a lot with the 79yz/it 400, they are their own design but a 465/490 rod if I remember correctly was the same length and bearings but a heck of a whole lot heavier and a 465 piston has a different pin height so a spacer will need to be made to fit under the jug.


Posted by: Tom68---------------------

Sounds like a 2.5mm spacer? That will be good as there doesn't appear to be much industry support for this motor.


Posted by: jsantapau---------------------

some times you get lucky on those auction sites , SpeedandSport in Pennsylvania, U.S.A is an old Yamaha dealer that specializes in buying up discontinued & N.O.S parts to help keep some of these older bikes going. They are good. I am sure there are others in the world but they are the only ones I know of


Posted by: mxbundy---------------------

Quote:
Originally Posted by jsantapau
some times you get lucky on those auction sites , SpeedandSport in Pennsylvania, U.S.A is an old Yamaha dealer that specializes in buying up discontinued & N.O.S parts to help keep some of these older bikes going. They are good. I am sure there are others in the world but they are the only ones I know of



Rick Horvat, here in the states has both rod kits and piston kits for the IT425.
330-995 0245


Posted by: Tom68---------------------

Quote:
Originally Posted by mxbundy
Rick Horvat, here in the states has both rod kits and piston kits for the IT425.
330-995 0245

Thanks, better stop dreaming and get it split and make sure the gearbox is good.


Posted by: Tom68---------------------

Split the cases, gearbox perfect and got a genuine rod locally for $107. Now for the Piston I'll try Rick tonight.



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