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I started a spreadsheet a while back and your right RD's and R5 are pretty easy.  But I have several DT's and those carbs are all over the map. When I finish it I will offer it up here for anyone interested.  Ebay is great for NLA needles and jets, lots of NOS Yamaha / genuine Mikuni if you can navigate the PNs

Anybody have or know where to access a cross reference chart? from Yamaha part numbers to Mikuni part numbers.  Main and pilot jets are pretty straight forward but needles, needle jets, and slides are a little less intuitive.
 It seems easier to find genuine Mikuni parts (needles and jets etc.) if you know the Yamaha number.  Everyone hear speaks in Mikuni #'s while Ebay is full of genuine Mikuni pars but they are listed and packaged under the Yamaha # even though the actual part in the Yamaha package is stamped the Mikuni number. I feel more comfortable buying by the Yamaha # in Yamaha packaging to avoid sub standard knock-off "Mukuni" parts. 

Thanks Jeff

Added one today to Progressive policy...raised yearly premium $13.00

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Plenty of room to stretch it's legs in Ropesville Texas!

Thanks Mark

Thanks Mark, I appreciate the feedback on the 2 into 1 configuration. 

jeff

A Japanese seller on EBay is offing a chamberish style cross over 2 into one pipe for AC RD250-350's as well as other Rd's and RZ's.... anybody have any experience with or thoughts on the style?

jeff

https://www.ebay.com/itm/396558754585?_skw=rd350+chambers&itmmeta=01KQR9YWFRTAJ63Q41BM5BAEP7&hash=item5c54be6319:g:eqsAAeSwGIhoFDnm&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xBPJNk6j%2BuL%2FEHsgV3iXb3RkyDp42L4dFbBfEhAgpAtDeML0DtSSNOdHgUzZuBxQHqHxMZvfl8wLDVa5cmAxijWJoG1%2BzjlziZm%2BVi7X9rMZ1FsWbmPfQArVUPpl6F3MkbAQ2z7dOk%2FoKuu%2FagR%2BDY3rq5fgvXxAtodl38ZsMb8DwsR%2Fxls%2BXV6q0rKAapoxY%2BK0TNDIkkwWbkPICUxett2ZqX0dh88Riz20qB6vdSX%2FBPnJsmoG8Yiw1n9XPX%2BJzU%3D%7Ctkp%3ABk9SR4LI-4m-Zw

Anybody tried these or heard any feedback .  they are priced at 399.00 plus 130.00 plus tax. Should a little less than 600.00 delivered.  I was just looking to see if anyone had tried them.  I may have to be the Guinea Pig.

jeff

I just had to buy 2 pair from the $85.26 vendor so I can compare to the 103.99 vendor and confirm my hypothesis that they are indeed the same.

j

I chickened out on the $96.50 ones and bought ordered the $103.00 ones.  they arrived in 3 days and visually look great, I have not mic'd or measured anything yet so I will hope for the best and report back on how they turn out.  Gotta give it a try at that $. I think Mark in SC purchased the kveldwulf labeled ones and has reported in another thread.  I would definitely respect his review of them.   The question I have is, are all of these Chinese cylinders made at the same place?? Hard for me to believe that there would be enough upside in the knock off market, of a niche item, to justify "competition" amongst Chinese factories.  At these prices the china worker must "pay the factory" for the privilege of working there....WTH

j

Thanks again to everyone for taking the the time respond.

j

I go to yamahapartshouse.com and look up the respective part numbers for each model and see if they match. A perfect match means they obviously interchange. A different part number does not necessarily mean its a "NO-GO" just need to do more research to confirm or deny fitment. On some models you must change an interworking group of parts to gain compatibility/interchangeability.

j