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The TTR250 FAQ web pages -> TTR250 -> Modifications -> ttr 250 jug and piston
Post Info TOPIC: ttr 250 jug and piston
zach gramstad


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ttr 250 jug and piston
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i have a 2003 ttr125l it smokes and i know it needs new piston and rings but i dont want to just make it back to normal. i am curious to if a ttr 250 jug and piston will fit the 125 bottom end if anyone has any info on these please let me know



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zach gramstad


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and if it wont work will it be possible to put a 250 engine in without modifying to much?

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petenz


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Why not a BBR Motorsport 150cc kit...
new barrel/piston/rings/gaskets /stage 1 cam all come in the kit...

25cc extra dosn't sound like alot..but it's a 20% increass...



-- Edited by petenz on Wednesday 3rd of December 2014 05:00:05 AM

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Bikes... 06 TTR250 / 09 XT660R / 1977 Montesa Cota 348 MRR / 1979 Montesa H6 125 Enduro...

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TTRfan


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zach gramstad wrote:

i have a 2003 ttr125l it smokes and i know it needs new piston and rings but i dont want to just make it back to normal. i am curious to if a ttr 250 jug and piston will fit the 125 bottom end if anyone has any info on these please let me know

Hi Zach. 

They are totally different engines and the chances of the TTR barrel fitting the crankcase and TTR125L cylinder head is remote.

Also, I am pretty sure the 125 frame wouldn't take the size of the TTR donk and the suspension might not be up to the extra weight.

Petenz's advice seems the best way forward.

Good luck!

Brian



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PlumasDude


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zach gramstad wrote:

and if it wont work will it be possible to put a 250 engine in without modifying to much?

Doesn't look like a good idea to me (I have one of each).  The 125 frame is too small and is a POS anyway.  I love the 125 but they gave it a cheap ass frame -- you may have the frame cradle from BBR that substitutes in part for the "missing" portion of the frame.  And the linkage would be under-engineered at every point.  Lots of welding.

I thought about the big bore kit summer before last (the one mentioned by petenz), there seems to be good 125 discussion on thumpertalk and dirtbikerz.  There is this guy I think in Australia who went all in, big bore, cam, ports, suspension ... : http://www.dirtriderz.com/topic/4011-ttr125-big-bore-crazy-stupid-awesome/ 



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