Derbi senda exhaust

[LJColeman]

i have a derbi senda extreme, all thats done to it at the mo is derestricted by factory, and some fancy red bits.. all im gettin is 40/43mph,

i was wondering what the best performance exhaust is, one that sits in the same place as original, not underslung,

i have also bought a 14t sprocket, so with this and a new pipe should i get better speed?

also when i buy a new pipe will i have to re-jet? or not because my bike is already de-restricted?

thanks.
____________________
Derbi Senda extreme

[dobby]

you will need to rejet if you change the exhaust...

when derestricted it should have a 15tooth front sprocket..
thats probably why your only getting 40mph out of it...

[Carvel]

I have a standard derbi senda extreme, just de-restricted and it just about goes off the clock 50+ and thats with a 14tooth sprocket so im guesing thats the speed problem

As for exhausts I think metrakit do one, and im pretty sure you'll need to upjet it


____________________
2002 Aprilia RSV1000R, Cbr600Fs, Mk1 B12, Vfr400 NC30...

Matt B: I can deal with crushed nuts to beat Ollie.

[LJColeman]

okay thank you, well ive just ordered a 14t so hopefully will sort it out,

and okay, but i thought it might not need doing cuz its already derestricted...

and oka ill look into metrakit
____________________
Derbi Senda extreme

[LJColeman]

okay thank you, well ive just ordered a 14t so hopefully will sort it out,

and okay, but i thought it might not need doing cuz its already derestricted...

and oka ill look into metrakit
____________________
Derbi Senda extreme

[LJColeman]

i was thinking of this exhaust, what do you think?

https://www.adrenalin-pedstop.co.uk/p/POLINI-FOR-RACE-EXHAUST---DERB-2760.aspx

thanks
____________________
Derbi Senda extreme

[N cee thirty]

seen a guy with a arrow exhaust on his aprilia rx,same as the derbi really ain't it ?

that should do like 60 with that exhaust

sure standard senda's are ment to be quite fast though,the rings and everything alright ? the exhaust not coked up ?
____________________
'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

[LJColeman]

okay, think im gna go for that polini race pipe though...


and yeah it all seems to be alright, runs perfect apart from the speed, but nice and smooth...
____________________
Derbi Senda extreme

[dobby]

did u derestrict it youself?

everytime we have derestricted a bike it always has a 15t f/s on...

did you change the atomiser tube and needle from a 208 to a 210???

[dobby]

you have been told what should be done already on the standard derestriction, we derestrict these bikes and gpr50's rs50 aswell all are derestricted in the same way that me and cheekythomas have told you in you last thread all do 50mph+ so obviously something is not right with the way they/you have derestricted it....

[LJColeman]

I bought the bike de-restricted so I havnt got a clue. The only de-restriction on the bike is in the exhaust that I know of. And it's running a 11t sprocket.
____________________
Derbi Senda extreme

[dobby]

Yes if its been derestricted to the spec from Derbi, it should have a different front sprocket as its massively down geared when restricted.

You should have a 105main jet, GA210 atomiser tube, A22 needle on middle notch, the exhaust resonator pipe removed and blanked, the washer in the downpipe removed, a 15t front sprocket fitted, and the carb plate removed.

if you only have an 11t front sprocket it has not been derestricted properly, so it is worth checking all of these 1st chap

[LJColeman]

You should have a 105main jet, GA210 atomiser tube, A22 needle on middle notch, the exhaust resonator pipe removed and blanked, the washer in the downpipe removed, a 15t front sprocket fitted, and the carb plate removed.

Only thing i know is that the washer in the exhaust was drilled out... and i have a 14t sprocket on the way...

i tried removing the carb plate but the bike ran like shit so put it back inn...

i dont know what the GA210 atomiser tube and A22 needle is so i dont know about them..

but ive just ordered a polini race pipe, and a Main jet...
____________________
Derbi Senda extreme

[LJColeman]

does anyone know what size the standard derbi senda malossi carb is, because i was thinking if getting one? or shud i just get a 21mm?
____________________
Derbi Senda extreme

[dobby]

atomiser tube is number 4 and the needle is number 3

[cheekythomas]

The carb originally is a 17.5mm dellorto... if your running a standard barrel you dont want a race orientated exhaust as it wont start making power until the standard barrels power is running out, meaning it will be gutless, and just start to accelerate as it then runs out of revs... meaning youll be redlining it anywhere and everywhere, which will just kill the poor thing...

... you want a more midrange exhaust system, designed to be used on the standard barrel. Gianelli, Technigas etc all do them.

The polini is a awesome pipe, but requires a much higher revving barrel.

You need to get your carb sorted before doing anything else, get the main jet, atomizer and needle, fit them and remove the plate and itll go much better as it is...

[LJColeman]

Okay im not going to bother doing that now,

As i have just ordered a Polini 21mm Carb kit, And a Polini For Race 2 Exhaust, And some carbon reeds....

I also ordered a range of Main jet's, with the 21mm carb and polini exhaust ( de-restricted ) What size main jet would you think i would need?

thanksss
____________________
Derbi Senda extreme

[LJColeman]

Okay so shall i just buy like a Leovince v6 exhaust?

And shall i bother changing the carb or not?

what sort of main jet size?

and what do i have to do to the atomizer tube and that??

thanks for the help
____________________
Derbi Senda extreme

[dobby]

1) undo the carb bowl and undo the main jet
2) undo the screw at the top ond take out the throttle slider tube
you will see the needle attatched to the bottom of that.
3) you will see a small brass tube that the needle goes through.
4) from the top of the carb push it out with a small allen key
5) on the side of the tube it will have a number

[LJColeman]

Will a 21mm malossi carb and a metrakit exhaust exhaust work well on my bike? Any Ideas of jet sizes for this setup?

Thank
____________________
Derbi Senda extreme

[LJColeman]

Also my front sprocket came today, but when i went to fit it, the original washer and bolts did not fit the new sprocket :@

anyone else have this problem?

thanks
____________________
Derbi Senda extreme

[dobby]

as i told you in you last thread you need to buy a front sprocket retaining washer for it, as you havent listened to me or cheekythomas you will have to wait now before you can fit it..

i give up with you!!

[LJColeman]

where can i get a retaining washer ? :S
____________________
Derbi Senda extreme

[dobby]

most bike shops you will prob need 2 M6 5mm allen key screws aswell...

take your 14t front sprocket with you!!

[LJColeman]

okay thanks, i just rang fowlers and they have the washer but no bolts,

any ideas where i could get the bolts? somewhere like halfords? thanks
____________________
Derbi Senda extreme