Yamaha DTR 125 bore / rebore

[Neil.dt]

i have a yamaha dtr 125 its been bored out but from normal its been bored out 2.5mm oversize what cc will it make the bike ? any one know

[Guest CardBoardDave]

Sorry wrong forum Try here http://tinyurl.com/283ghcb

[Neil.dt]

thanks for nothing brv

[Guest CardBoardDave]

Well ive had a good look and ive not found much im afraid. I cant even find any 58.5mm pistons for a dt125 only 58mm even then i cant give you a cc

[Vez]

You will find it rare to get a response to a question on your first post.

Try introducing yourself in the bar section of this forum, politeness goes along way

[Neil.dt]

fair play thanks for ya time

[Vez]

F**k it, i'm bored.

http://cgi.ebay.co.uk/Piston-Kit-Yamaha-2-50-TZR-DT125R-TDR-TZR250-58-90mm-/160495029986?pt=UK_Motorcycle_Parts&hash=item255e3fcee2   58.9mm DTR piston,2.5mm overbore apparently  .

Displacement = stroke x π x (bore/2)² x Number of cylinders. 

So, providing your DTR is pre 04 and with a stroke of 50.7mm

Then,

50.7 x π x (58.9/2)² x 1 = 138.142.8559 x10³  or about 138 cc

[David Baker]

F**k it, i'm bored.

http://cgi.ebay.co.uk/Piston-Kit-Yamaha-2-50-TZR-DT125R-TDR-TZR250-58-90mm-/160495029986?pt=UK_Motorcycle_Parts&hash=item255e3fcee2   58.9mm DTR piston,2.5mm overbore apparently  .

Displacement = stroke x π x (bore/2)² x Number of cylinders. 

So, providing your DTR is pre 04 and with a stroke of 50.7mm

Then,

50.7 x π x (58.9/2)² x 1 = 138.142.8559 x10³  or about 138 cc

Someone knows their stuff Did you do physics by any chance haha

[Vez]

Someone knows their stuff Did you do physics by any chance haha

Still doing it, for another 2 years at least

[Neil.dt]

thanks very much all iv been asking every one for long time and this is the first i got a answer