Yz cylinder questions?

Anyone know if a 97-98 Yz 250 cylinder will bolt up to the cases of a 96 Yz250? I thought I read somewhere that the cylinder angle was a little different. Basically looking for the upgraded PV and porting and was wondering if it was possible. Thanks in advance.

The 97-98 YZ250 cylinder head can physically be bolt to a 96's case. While the porting on the 97-98 cylinder head may have a significant advantage when paired with the 97-98 case, it does not constitute the same when paired with a 96 case. The porting on the crankcase is visually different between the 96 and 97-98 and may hinder any performance gain. The 97-98 and 96 cylinders cannot interchange reed cages as well as pipes. Both the exhaust and intake were changed on the 97 model.

Im prepared to drop the coin on the intake... I have a Noleen exhaust from a 97 yz that I would run on the bike. I wonder how much the performance would be hindered by the porting. Or if an engine builder like Mr. Gorr could make it work. Id like to get some top end out of the bike and the 96 cylinder doesnt really allow for that.

If I was a pro level rider that could rev the piss outta the thing all the time it wouldnt be an issue but its nearly impossible to gain top end on this bike without the bottom end suffering more than it already does and losing the monster of a mid range the 96 has.

I might have to mess with some different set ups on this bike to see what will work and what wont

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Rixter
      A tiny clear rubber tube on bottom of carb.  On bottom sort of on side, by floats, the other end just hanging down.  Was it always like this? Or does the other end go somewhere?  Today after multiple trys with kick, choke on/off ,,,fuel keeps pouring out the tube.  This bike has always been hard to start.   Thanx  guys!
    • By Brock granberg
      I just did my valve adjustments and put my YZ250f back together as far as the valves, shims buckets and cam covers on but I need adhesive for the plastic valve/cam cover and I am stumped as far as what to use and where to get it or even what to call it! Need to get some soon im in need of a ride!
    • By ThatE30GUY
      Hey guys, I bought this YZ85 and came to realise the clutch wasnt working, so I drained the oil (Jet black) and pulled the plates out and cleaned them. I assumed finding a torque wrench would be easier than it has been. Does anyone know how to torque the clutch springs to spec without a wrench? Any insight helps.