Should I put a 350X Engine in my 250X or just soup up my 250X engine.
#1
#3
This is a question I had asked myself about a month ago. After doing some pricing I have opted to finish hopping up my 250x w/ a 80mm 288cc big bore kit ($300 from 4 Stoke Tech + $150 for resleeving and boring). If I get the stroker ($350-$500) it will be 352cc or if I get a 300ex bottom end 330cc. With these mods, mid-range cam, high lift spring kit, high strength cam chain, ported exhast, large port racing carb(2mm bigger than stock eliminating the accelerator pump), K&N filter, and my big bore kit I should be able to run with a stock 400ex or maybe even a piped one. Which is not bad, but with those mods that is about every thing that can be done to this motor. So now with stripping it down to the frame last night to powdercoat I'm starting to wish I had spent the $1,000-1,500 to go with a 350x motor. At first the modded 250x may even be faster that the stock 350x motor or the same but with the 350x motor I could mod it out to 498cc and never have to worry about power again. I have heard though that there is a crankcase problem with the 350x's, also I would have to have gotten a custom exhaust for the front between the motor and frame. I have also heard that the '86 is a better motor that an '85.
So it is basically a money decision you have to make. If you have to slowly make upgrades to the 250x motor or shell out $1,000-1,500 for a 350x motor.
D@#%! Sorry to be so long winded! Hope this helps.
So it is basically a money decision you have to make. If you have to slowly make upgrades to the 250x motor or shell out $1,000-1,500 for a 350x motor.
D@#%! Sorry to be so long winded! Hope this helps.
#4
Two of my buddies have 350x's for sale for 900 dollars. Complete bikes. If you want more info e-mail me at badboyzracing_99@hotmail.com
#6
Good point THEXOTIC1! Lots of power there with the 350x & 500xr head conversion! With the head conversion you have to machine the case. Another thing I forgot to mention is you would also not have reverse with the 350x. Also that when adding the stroker to the 250x big bore kit the gearing is not strong enough and the clutch will have to be redone.
Maybe I could do the 350x head with 250x bottom end (300ex would be better) machine the case halves and have reverse too! Hmmmmm.
Maybe I could do the 350x head with 250x bottom end (300ex would be better) machine the case halves and have reverse too! Hmmmmm.
#7
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KimSJoh
Polaris Ask an Expert! In fond memory of Old Polaris Tech.
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07-18-2015 07:20 PM
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