125 TZR CDI

[lee_tzr]

hi this is my first post on this site ,ive got an on going problem with my tzr 125 (nothing a can of petrol and a match wont sort im sure !) it starts and revs up but as soon as the revs drop below about 3000rpm it wont rev back up ive tryed most things i can think of ,cleaned out tank fresh petrol,different carb and also tryed new jets etc ,its also just had a fresh rebore ,new plug and coil etc ,ive visually checked the reed valve it looks ok but its the first one ive looked at so im not an expert ,im thinking it may be an electical fault ,can anyone tell me if a fault with the cdi unit could cause a fault like this ? and would it be worth changing the reed valve just to be sure ,if not a may try the petrol and match method !

any advise would help ! thanks

[hornetmike]

any ideas we've been stuck with this for weeks.
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87 Honda CG 125 - 97 ER5 - SR 50 -81 Z250- 96 CBR 600 F- 94 GPX600R 88- GPX 400R- 87 GS 125 - 2006 Honda CB600F- 2003 ER5 - Honda CBF 1000 2009 - Honda CBR 600 RR 2011
Current BMW R1200GS 2010

[N cee thirty]

the throttle cable snapping the slide back down ?

my rxs cable was all seized so revved up and then you had to keep twisting it to make the revs go up again
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[finpos]

Forgive my failing memory - is this the TZR with the exhaust valve? If so, it's stuck!

f.

[andy 13]

hi a would doubt if its ur cdi unit thats cozing ur rev problem tzr was ma 1st bike and cdi unit went on it and it wouldnt fire atall did u run it in properly after ur rebore

[andy 13]

and jus incase u want 2 check it is the cdi unit there is 1 for sale on ebay jus now for 15 quid 2 days and 20 hours left

[hornetmike]

Thanks for replies, hasn't run since rebore, wasn't running properly before rebore. nothing has changed with rebore. Tried exhaust valve open and closed.

This is a video of it running.

https://youtu.be/d83uTlAs3Cw
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87 Honda CG 125 - 97 ER5 - SR 50 -81 Z250- 96 CBR 600 F- 94 GPX600R 88- GPX 400R- 87 GS 125 - 2006 Honda CB600F- 2003 ER5 - Honda CBF 1000 2009 - Honda CBR 600 RR 2011
Current BMW R1200GS 2010

[Vincent]

Are you sure that the carb slide is in the right way round?
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Space Is Deep

[lee_tzr]

thanks for all the input ive now got it running i took the plunge and bought a cdi unit off ebay put it on and now its fine ,i wasnt convinced it was gonna work but i was running out of ideas ! a least it s sorted now

thanks again lee