RD400 bore 65.5mm?

[slide]

Hi is anyone a Rd expert out there if so im on a 1mm overbore piston already can i go higher with after market or maybe RZ pistons? who has done it and was it a success? or are new barrels a better way to go?

[robinm]

wiseco do a 2mm o/s at 66mm. Available ex USA no problems.
http://www.wiseco.com/ProductDetail.aspx?ItemID=393M06600&ModelID=301&ModelYear=1979&AppID=1716

[slide]

Thanks i have also found these in Aussie

http://www.ebay.com.au/itm/YAMAHA-RD400-OVER-BORE-PISTON-KIT-GASKET-SET-NOS-NEW-RD-400-/280787161462?pt=Motorcycles_Parts_Accessories&hash=item4160381176#ht_1885wt_914

What i really wanted to know since Yamaha don't go over 1mm then is the 2mm reliable and who does top quality re-bores and crank rebuilds?

[eelracing]

What i really wanted to know since Yamaha don't go over 1mm then is the 2mm reliable and who does top quality re-bores and crank rebuilds?

Have a chat with Hugh at BOSS Engineering Ph 06 348 9516 he has done a few oversize jobbies on VMX bikes without probs.
He also does re-sleeving back to original size as well as offering rebores,hones and crank rebuilds.But discuss it with him first and go with your best option.

I very nearly bought an RD400 as my first big bike after coming off my learners.Walked into the dealers with a deposit and me mum as the loan securer.Didnt take more than two steps into the doorway and clapped eyes on a freshly traded in RD250LC and the rest as they say is history.Now looking back I wish i'd gone away with the 400.:cool:

[slide]

Hi thanks for that i will ring him and i know how you feel except my dad would only secure the loan if i got the CB250 hahaha and i went straight to gsxr's after that all 8 of them from the 1985 upto my last one the K4 1000 but know im reliving my youth and i have 2 rd400s to rebuild and a Speed Triple tp ride :)

[Pedrostt500]

Doubt there hasnt been much that hasnt been done to a RD 400 / 350 over the years.

[husaberg]

Hi is anyone a Rd expert out there if so im on a 1mm overbore piston already can i go higher with after market or maybe RZ pistons? who has done it and was it a success? or are new barrels a better way to go?

I remembered this thread
http://www.saltmine.org.uk/dale/dale-faq.htm (http://www.saltmine.org.uk/dale/dale-faq.htm)

It has a lot of Yamaha stuff.
I has a few ideas for OS pistons.