ysr yz250 swap - Page 2

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ysr yz250 swap

This is a discussion on ysr yz250 swap within the NSR50, NSF100F, MB5, NS1 and RCV Mini forums, part of the General Talk category; I know its a bit older but wondering what happened with your build. I too have resurrected my ysr250 (wr250) build. Wondering about your kx85 ...

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Thread: ysr yz250 swap

  1. #16
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    Doubledown21's Avatar

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    I know its a bit older but wondering what happened with your build. I too have resurrected my ysr250 (wr250) build. Wondering about your kx85 fork use. Is the stem for that triple fit the same bearings as the ysr neck or...what did you have to do toe get that all to fit?
    Thanks

  2. #17
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    Hey I'm still working on the bike. I let it sit for a long time but it will be finished this year. I used the kx85 triple tree with all balls tapered bearing and a custom lower bearing adapter. I'm actually switching to yz85 forks soon so I'll post a pic of the lower bearing spacer when I pull the front end apart

  3. #18
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    Quote Originally Posted by ysr90 View Post
    Hey I'm still working on the bike. I let it sit for a long time but it will be finished this year. I used the kx85 triple tree with all balls tapered bearing and a custom lower bearing adapter. I'm actually switching to yz85 forks soon so I'll post a pic of the lower bearing spacer when I pull the front end apart
    Keep me posted. I am interested in the all the specs on the adapter you use and what forks etc. would like to update my 250 when that time comes as well.
    Thanks

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  5. #19
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    Here's a pic of that adapter but I forgot to get measurements

  6. #20
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    Also here is a couple pics of the bike after all these years I finally got it finished


  7. #21
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    Looks really good, good work. If you ever happen to tear it back down please get some measurements on your adapter.
    What carb are you running and what jetting? Looks we have about 500' from sea level difference but it would give me a nice starting point. How does she run on the street with that yz gearing and the rz pipe? Was it just the header mount that you had to modify to get that pipe to work?

  8. #22
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    I'm using a 94 yz250 mikuni tm carburetor with the stock jetting so far. I haven't ridden it on the street much just around the block twice but it seems to be ok. That pipe is the stock yz250 pipe I cut it into 6-7 sections and welded it back together so it fit under the bike. That adapter uses the all balls steering stem bearings. So if you had the bearings it just needs to go over the kx85 lower stem and fit inside the bearing. I might be able to measure the height with it on the bike.

  9. #23
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    Did the rz350 pipe not work out well?

  10. #24
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    It didn't work for what I was trying to do. I searched all over for that stupid pipe too and ended up buying it out of Canada and paying too much.

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