exhaust s

[marko]

Hi all i have a exhaust with a exspantion chamber it is about 2 inches from the manifold and about 9 inches long . could anyone ell me what will happen if i cut this off and weld a plate over the hole to make it a straight thro pipe. any help please much appriciated thank you
my eyes are wide with interest in this pipe could it be the ristrictor ????

[McJamweasel]

You mean take off the expansion chamber?

You'll bugger the power completely. They are there for a reason.
____________________
BCF: Be yourself, just don't be an arse.

[cagiva gezzer]

Are you talkning about a scooter exhaust?

If so, this small pipe is the restrictor for the exhaust. Its not the expansion chamber, its a chamber which makes the expansion chamber seem to the engine to be a larger volume. It makes the exhaust less efficient and reduces power.

If you remove it and seal the hole up, it should increase power.
____________________
"because one stroke isnt enough and four strokes waste two"

[marko]

right the bike is a 125 cagiva mito 2000 model.
so is the ristricto actually in side the main exhaust chamber and not in the exspantion chamber????

[Dr Nick]

Why don't you buy an aftermarket pipe, and when you come to sell the bike you can take it off and put original one back on, plus it will go a lot better with something like an arrow pipe on it.

[marko]

i have decided to leave the pipe alone and bye a aftermarket exhaust this way i wont mess up. Will the bike need retuneing tho if i put a arrows on it?????

[McJamweasel]

Yes, it will need rejetting. You will also need to remove the other restrictors, although I'm not sure what they are on the Mito.

An aftermarket pipe won't make much difference over a standard derestricted one tho.
____________________
BCF: Be yourself, just don't be an arse.

[93 NSR]

i've got mito and it's got a acerbid back box on it but i'm not sure if the expansion chamber part of it is standard or not. How can i tell? i had to put the standard back box on for the mot it and it was real hard to ride.
Also what sprockets would you recomend because it only does 100.

Craig.

[Racer X]

want more speed, try a 15T or 16T front sproket, leave the rear sproket as it is!!
____________________
< Live To Ride & Ride To Live >

[93 NSR]

what do you rekon is on the front at the moment then?? saves me taking all the fairings off! its an early mito, mk1.
Craig

[Dr Nick]

probs 14:36
uprate the front to a 15 for more top end

[Scotty]

Remember doing that will see you a loss of accleration, and maybe even a lower top speed. as i wouldnt say a 125 can budge past 100mph if its lucky...

And changing the gear ratinos so there taller will / maybe make the give be slightly out of the peak power band thus owering your top speed, or renderning your last gear crap...

i'd probably only go up gears id the cylinder was bored out... or i had some mods to make the engine put out more BHP.
____________________
Regards
Scott

[Kickstart]

[93 NSR]

i'll go and chech the rear sprocket then. i think it's the mito racing but i may be wrong. Any clue where i can get hayne's manuel??

Craig.

[cagiva gezzer]

Haynes dont do one, but you can downlaod them from keith's site or buy a cd version from ebay.

https://www.alfa-pages.co.uk/cagiva/c12.htm
____________________
"because one stroke isnt enough and four strokes waste two"

[Zimma]

[Kickstart]

Hi

Mmm, suspect it a tank ran over it then it would be a plane Mito.

Oh well, it got past the spell checker. Anna will kill me for it though.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing