TZR 50/80

Thanks for the replys, looks like i'll be removing it then, my bike could definatley be louder!

Hi everyone! Its been bugging me for a while now and hopefully this will get it sorted. My question is, does exhaust packing (the fiber glass stuff in the tail can) make any difference to performance, is it best to have it in or not and would an upjet or something be required if removed, or is it just purely a noise reducer?

Could anyone tell me how to upload pictures, thanks!

Ok i'll give everything a go, hopefully it'll be good news after that. Thanks for your help.

Yes, how would you recommend adjusting it, I always get a bit lost when it comes to needles and what it does when you move it

HI, Both the jets are a 5mm thread and both carbs are dellorto, the 85 seems to be the only thing the 21mm runs on, I have tried the 118 in the 21mm, the bike wouldnt even pull me up a small hill, then tried a 95 and it ran much better, then the 85 even better, but only up to about 9250rpm then it stops developing power and just starts screeming its head off!

My Dad seems to think it could be the spark plug gap, and that it needs a bigger one to give it more top but we've done this before on the old carb with no results, do you think it could be a factor? thanks in advance!

The main jet in the 16mm is a 118 and the 21mm has a 85.

yes I am, I think, is it when you ride it flat out for a little while then pull the clutch in and kill the bike immediately, then check the colour of the plug, I just dont know how long to ride it for before killing it thats all.

Hi, thanks for the reply, I have not done everything quickly I've had the bike for about 14 months and been building it up slowly and had the old carb on it forever, which was running fine but just wasn't quite big enough and was the last thing I needed to upgrade. I have plenty of jets to mess around with, also I was wondering which direction does the jet size have to go when upgrading to a bigger carb, larger or smaller, also the 16mm had the airscrew on 6 turns out, whereas the 21mm, at the moment only has 1.5 turns but the jet is quite a lot smaller, so do you think it might just need more air and petrol? : ) p.s No way am I going a tooth smaller on the front sprocket, it actually needs a tooth bigger for higher top speed (but only after its running right)

Hi everyone, this is my first post and I need some help with my TZR 50, it has a polini 80cc bore kit, technigas expansion chamber, bored out reed block with polini carbon reeds, high spec inlet manifold, 21mm TNT carb with a polini sponge air filter. I've only just put the carb on, previously was the standard 16mm, it went fine but I always knew it could do more as the powerband was tiny and right at the top of the rev range, now with the bigger carb the powerband is much bigger (and a bit more powerfull) but a lot lower down the rev range and it starts to run out of puff at about 9250rpm whereas before it could pull to 10250, if anyone could sugest anything I would appreciate it alot, thanks! : )