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Discussion Starter · #1 ·
im looking at a 250r with some mods to it.

esr 265cc pv cylinder w trx5 porting
trx5 pipe
28mm mikuni carb
rad valve
stock arboxw/lid on


he had it dynoed at 48hp



but my question is:
if i buy it, can i send the cylinder to esr and have it modified to 370cc? or could any shop do it?



 

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Aren't the placement of the head studs closer together on the 265s and 310s? I'm not sure if you can fit the 350 sleeve in there.
 

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michael you could be right. now that you mention it i think i have heard that there was some difference. but i thought the 310 and the 330 cylinders were the same. i would assume the 330 is the same as the 350. maybe its just the 265 thats different.
 

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We'll have to get Neil to chime in here. The o'ring grooves could be different as well.
 

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We'll have to get Neil to chime in here. The o'ring grooves could be different as well.
i had a ct 310 pro x and resleved it to a 350 now
 

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Resleeving to a bigger sleeve in a Pro-x cylinder depends on where the head studs are located & size (DIA) of the o ring grooves.
The 250/265 non pv cylinder castings are the same, 250/265 pv cylinders are different from non pv. 310/330/350 are same casting, just different head stud location & o ring groove sizes for each STD bore size. 310/330/350 pv cylinder castings are different than non pv cylinders.

I dont think the 265 could be made into a 350, unless some heavy machining & welding was done. For one, like where the head studs are located now, those holes would need filling in & moved to the outside farther away from the bore. O ring groove in the casting would need welding up & deck re-machined flat.
Inner o ring groove, no problem because its located in the top on the sleeve itself.
Now, once thats all done & you have the bigger sleeve in place, now the portings all off from what it was before & will need to be reset to your likeing so thats a port job.
After its all done, welding, machining, taking what you have & turning it into another size, 265 up to a 350, you now have over $2,000.00 or more into a used cylinder that you could have bought brand new for around $1200.00.
It can be done though.
If you can do welding & machining, thats a big cost savings.
Neil
 

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for some reason it wont let me login to my butters name. when i log it, it shows that logging in window, and then when it takes me back to the forum screen it shows im not logged in... i dont get it... loll




but anyways, the guy wont go any lower than $4,900 for the package deal. so im going to try to keep looking.
it hard to find a nice r around here.
 
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