carburator on altitude

**niels** · #1 20 Dec 2004

hello,
i found out that climbing from sealevel to an altitude up to 2500 meters higher has a big influence on my bike. has something to do with my yamaha's ttr 250 carburator i suppose.(airpressure, no?) im not a very big mechanic myself, so has somebody some tips on that or should i adjust it all the time?
thanks
niels

**Grant Johnson** · #2 20 Dec 2004

Do a search in the Search box above, HUBB & Website for:

carb altitude rich jetting

and you'll find 9 very relevant documents to help you along!

You DO want to make some changes, just don't want to go crazy all the time changing it!

MOST important, don't lean it out for altitude and then not bother to richen it up as you go down. Some have found out the hard (expensive) way that's not a good thing.

Too rich is ok, too lean is NOT!

------------------
Grant Johnson

Seek, and ye shall find.
------------------------

One world, Two wheels.
www.HorizonsUnlimited.com

**niels** · #3 10 Jan 2005

hi grant,
thanks for the tip but when i open the results in the search box they are massive reading, full on reports that i can not read because off superslow internet connections and lack of time.
is there any other info available?

thanks
niels

**beddhist** · #4 10 Jan 2005

1. Check air filter is clean.
2. Remove air filter while at altitude.
3. Lower needle in carb.
4. Install new main jet one size smaller.

------------------
Salut from Southern France, the bikers' paradise,

Peter.

**niels** · #5 13 Jan 2005

thanks peter,
next week in pakistan i will give it a go.
and south france is the bikersparadise.maybe i see you around somewhere in may as i probably visit nice and my uncle appartment in marina baye des anges.
greetz
niels

**beddhist** · #6 14 Jan 2005

Please do look us up!