jets needles and more hassle

[curryhead]

if i wanted to put a sports exhause with the down pipes and end can on a two squeak err say a dt 125r for instance would i have to rejet the carb even though the manufacturers have said that i wont need to. but you usually do dont you and you need a rolling road to set it up properly. am i right?
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take it easy, watch out for blind car drivers!

[Joe Camel]

Rejetting is not ALWAYS needed, see how it runs first...

for example, if it runs OK high up the revs but crap low down, then you need to add more fuel in the midrange, try dropping the needle one notch at a time and see if it improves. Conversely, if it is OK low down but runs out of puff high up the rev range, lift the needle ONE NOTCH AT A TIME. this can make a massive difference.
If you do put a bigger main jet in beware of overfueling, this will give you lots of "bogging down" as you open the throttle.
Also with a bigger jet there will be less vacumn to lift fuel. slow throttle response is often a symptom of this, try the pipe, with a good filter, ie K&N or powerflo, befroe messing with carb.
This will end in tears without the proper test equipment,

good luck.
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***THE VOICES MADE ME DO IT***
***NOT STOCK & TWO SMOKIN BARRELS***

[Hunter]

You maybe able to get away with messing about float levels and needles in the carb. A plug chop should tell you what exactly is going on inside the engine when you put a new pipe on.

[Kickstart]

[Ropehead]

the Dt and TZR hav a 170 Main jet , when i put a race exhaust i ended up tacking it up to a 180 to get it right, so not a HUGE diffrence.

Just have a play about and do some PLUG CHOPS

[curryhead]

plug chops? en anglais s.v.p.
but could you ride it around without causing any dammage to it with the smaller jet instead of putting on a 180
____________________
take it easy, watch out for blind car drivers!

[Ropehead]

PLUG CHOPP>
drive along keeping the engine at about 8,000 then press the KILL swich pull the cluch in and roll to a stop, remove the plug and check to see what its like,,, it should be coffee brown ,,, lighter. to hot needs bigger jet... oily brown needs smaller jet..

EASY

[curryhead]

doesnt matter now any way as ive just bought my mates mini for a hundred quid. il just have to wait untill the ti rod comes out before i can ride another bike so see y'all in 5 years at bh
____________________
take it easy, watch out for blind car drivers!