need help with 2000 mxz 700 carbs - HCS Snowmobile Forums

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Old 08-30-2010, 10:54 PM   #1 (permalink)
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ok so long story short my buddy has a 2000 mxz 700 with roundslide carbs and wants to switch to flatslides. he says stock 700s are 40 mm and my other buddy who parted out his 03 rev 800 x also has his flatslides still. pretty sure the 800 carbs are 40m also. now what is the difference between the two jetting wise? are they the same? i wouldnt think they are but i could be wrong.

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Old 08-31-2010, 05:55 AM   #2 (permalink)
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All carburetors work on pressure differentials. The greater the differential (suction), the more fuel flows through a given jet size. Plus, certain jets flow differently for a given size than others. Example: hex jets versus rounds. This has to do with entrance angles, length of orifice, etc.

Flatslides typically produce a stronger suction signal than roundslides. Therefore would likely use smaller jets than a roundslide on a given engine.

Also, a bigger cc engine has a stronger suction signal than a smaller one, so would probably use smaller jets as well.

Therefore, using flatslide carbs from a 800 on a 700 could result in the 700 being too lean unless rejetted. This can include needles and needle jets as well.

It pays to start rich and work your way down very slowly.
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Old 09-14-2010, 11:05 PM   #3 (permalink)
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The 700 ran better with roundslides + better on gas
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Old 09-16-2010, 12:30 AM   #4 (permalink)
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rounds slides use MUCh lower jetting than flats...round slides are AWESOME! I run a set on my rev 2007 big bore! MORE POWER! cut 5 coils off and go play!
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