Derbi senda acceleration problem [help?]

[SM4CK5HOT]

hey, i have just registered on this website and was looking for some advise on my derbi senda x race,


first off, i had it de restricted by the garage had main jet increased and exhaust pipe chopped and washers removed also had new front and back sprockets everything was fine, then i decided to buy a performance pipe a tecnigas enox had that fitted but ever since that the acceleration is ok but pretty slow then all of a sudden i get a big burst of power, its not a problem but was wondering if this was normal because it did not happen with my stock exhaust

thanks, any advice would be greatly appreciated!

[Irn-Bru]

Well the garage jetted it for your stock exhaust, so now you've changed exhausts you'll need to get it done again.
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KTM 990 SMT & Suzuki DR-Z 400 SM

[SM4CK5HOT]

[jamieward]

from what I understand the exhaust corrects back pressure and this means that the jets will need changing if you change the exhaust buddy


goodluck mate
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first bike was a derbi gpr 50 got some right looks when I fired up lol
second bike is a tuono rs 125 love the bike keeps up with the 600's

[Irn-Bru]

[dansp1]

It is more likely that the exhaust you have fitted is designed to work with a big bore kit or a barrel in a different state of tune.
The jetting is obviously important, you dont want to hole a piston, but it may be that the pipe has just moved the power band higher up the rev range, this can only be done at the expense of bottom end / mid range power( which tend to be lacking anyway on a 50)
Hence why it feels gutless until you are revving the tits off it

[SM4CK5HOT]

[SM4CK5HOT]

anyone got any ideas? of what to do/ jet sizes?