You and
Baikal has totally different problems to copy with....
He
always rides at sealevel and has about
95-
100 Hp at sealevel when carbs are dialed in right.
( he also have to consider predetonation due to a high compression head and maybe a to aggresive ignition timing for
sealevel use).
You have to deal with high altitude all the time,
and the little
440 is really finky to get dialed in even at sea level so the trouble for you is much worse to get it dialed in properly ( carbs and clutches ) for high altitude.
Your carbureted engine lose ~
20% of it total output at an altitude of just
1600 Meter !!!
So you have only about
75-
80 Hp at 1600 meters altitude in that little 440 cc engine.
If it is warmer outside even more power loss.
( This is why you always also have to adjust your clutching, to compensate for the engine power loss ! )
If you have the
stock head on your 440,
you should suggest to
Baikal that you switch them with his High Compression head.
This would be a
win-win situation for both of you !
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Keeping as much power as possible in your 440 engine !
Jetting a 2-stroke engine is somewhat difficult to do.
There are lots of variables that must be observed before it can be jetted properly.
Most professional tuners keep a detailed log of their jetting changes,
and plot those with respect to altitude, temperature and air density changes.
Here are some quick guidelines to keep in mind before attempting to jet your snowmobile:
* At higher altitudes, the engine runs richer (so you must jet leaner).
* The air is less dense at higher altitudes
(so you're essentially getting a smaller volume of air than you do near sea level).
* At warmer temperatures, the engine runs richer (so you must jet leaner).
* During the warm spring, you typically want to use a smaller main jet.
* During the cold winter, you have to use bigger main jet,
and you may even have to raise the jet needle (lower the clip).
* At high humidity or when it's wet, the engine also runs richer
(so you must jet leaner).
Also remember that:
20% of the caburation work will correct 80% of the jetting problems
and get you 90% of the engine's power.
That last 10% of power requires
four times as much work.
To get as much power as possible from your little
440 engine without to much hassle and wrenching,
get yourself a
Holztman ATACC device.
Link:
*
http://www.holtzmaneng.com/Atacc.html
*
http://www.holtzmaneng.com/
