https://www.dirtbikeaddicts.com/forum/yamaha/454-bye-bye-yz250-smoker.htmlAny one in here have big bore on there two stroke. 265, 285, 295
How do you like it? Downsides?
I'm thinking of building a Eric Gorr 265 but wonder if it's worth the money for 15cc
I want to go 265 to stay legal for racing.
You might want to think about that one. I rode a custom built KX250 with a 300 kit and a WR tranny and geared for high speeds. It was built by Team Green so it had a lot of motor work done, but I felt you had to shift too much with the WR tranny to get the motor in the sweat spot, even with a heavier flywheel. I would say (and this is just me, so take it as you will) that you should play with gearing first after the 265 kit is done and maybe a flywheel adjustment before going out and installing the WR tranny....But again that is just me..Well seems like ossi likes his 265, that got me thinking about WR gears as well
You might want to think about that one. I rode a custom built KX250 with a 300 kit and a WR tranny and geared for high speeds. It was built by Team Green so it had a lot of motor work done, but I felt you had to shift too much with the WR tranny to get the motor in the sweat spot, even with a heavier flywheel. I would say (and this is just me, so take it as you will) that you should play with gearing first after the 265 kit is done and maybe a flywheel adjustment before going out and installing the WR tranny....But again that is just me..
Sweet, give us a ride report...Waiting on the pipe coupler from T.M. Then we can try out the new 295 from Eric gorr.
Dude you pull 60hp out of a YZ300 motor and sign me up...I had a built KX500 that was putting 63HP to the ground and that was some serious brute power...I use a YZ 2nd ,3rd and 4th. !st and 5th are WR.
I had the full WR transmission in my 01.
My 265 is just great for me in the hills and forest up
here. I am 187 pounds right now and really have all
the power I could use. I have hit the desert with this
one but have not gone Monster Climbing as of yet.
I can say I rode this bike back to back with a YZ 450
and the pull was different but no greater then each other.
Once again I post
the rough calculation; 0.12 HP per CC for a 4t, 0.2
HP per CC for a 2t. Both of these being modern
correctly jetted motors.
So you can have a Gorr YZ 300 2t at 60 HP by calculation
or a YZ 543 4t at 65 HP by calculation. I would run the
gear box as stated above in my 265.
Since we are spending Spies Dollars he should build both
and meet us at Jawbone so we all could test them
All that said I am a 2t guy, but would love a 4t for the desert.
Dude you pull 60hp out of a YZ300 motor and sign me up...I had a built KX500 that was putting 63HP to the ground and that was some serious brute power...
When you guys get all these 265, 285, 295, etc motors put together, let me know so I can meet you out in the dez with my cleaned up YZ250 and see how they compare..
Agreed, but I still love the sound of a good tuned and geared 250 2 stroker pinned across the desert and blipping the throttle when cresting a nice little hill that has a killer drop off on the other side and floating back to the desert floor and then back on the gas hard.... Oh Crap, I need to go have a smoke nowThere is hp and then there is torque. A 500cc two stroke will have way more torque in the low revs than a high strung 300. Like any other engineering decision it is a trade off. My choice is big bores and gobs of low end torque.