Serow gear ratios.

Jon V8 · 12-28-2011, 02:45 PM

Hello all,first post here - hope its not been asked before... I have fitted a 1989 xt225 Serow engine into a 1978 TY175 frame.My idea is to build an all Yamaha four stroke twinshock trials bike.I've got it to the stage of being able to ride it but early on I realise that the gear ratios are far from ideal.I got Talon engineering to make a rear sprocket to get first gear down low enough for trials use - which is spot on.I didnt pay much attention to the other ratios,hoping that with a six speed box it would be fairly close ratio so the others should be fairly close together.Not the case,from first which is ideal,second is far to big a gap and third again is too big a jump.
So my question is - what other models,(SR125,XT125,TW200 etc,etc) may I be able to rob gears from to mix and match to get the right ratios ? I'm quite happy to do the work,I just need to know what parts were common to the different models.

Jon V8 · 01-20-2012, 02:14 PM

Anyone any ideas ?

12-28-2011, 02:45 PM	#1
Jon V8 Join Date: Dec 2011 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Serow gear ratios. Hello all,first post here - hope its not been asked before... I have fitted a 1989 xt225 Serow engine into a 1978 TY175 frame.My idea is to build an all Yamaha four stroke twinshock trials bike.I've got it to the stage of being able to ride it but early on I realise that the gear ratios are far from ideal.I got Talon engineering to make a rear sprocket to get first gear down low enough for trials use - which is spot on.I didnt pay much attention to the other ratios,hoping that with a six speed box it would be fairly close ratio so the others should be fairly close together.Not the case,from first which is ideal,second is far to big a gap and third again is too big a jump. So my question is - what other models,(SR125,XT125,TW200 etc,etc) may I be able to rob gears from to mix and match to get the right ratios ? I'm quite happy to do the work,I just need to know what parts were common to the different models.

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01-20-2012, 02:14 PM	#2
Jon V8 Join Date: Dec 2011 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Anyone any ideas ?

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