All mechanical parts of the 400 2 stroke were basically the same from the time they came on in 1994 Sportsman,ScramblerExplorer,etc to the last year model Trail Blazer 400 in 2003. Some electric wiring and module differences between models. Weak link between the 2 stroke versus 4 stroke was longevity,especially on the top ends which is normal for 2 strokes.You need to keep on top of maintenance especially keeping air filters clean,etc. Plus this a complicated engine with a counter balancer that operates an internal water pump and external oil pump that was subject to water and dirt from being located at the front of the engine. Just study the 400 engine section breakdown on the service manual link I posted and get familiar with it.

 

Any idea hps for 2stroke and 4stroke? Yea I have pdf for most of the polaris. Also the guy gave me a new bendix gear and starter with these

 

Good! You'll need em!

 

The 500 H.O is 35hp the pre H.O is 30hp.
The 400 2 stroke is the same as the 500 H.O I have read.

Here some more.
Sportsman 400 H.O. 29.5 HP
Sportsman 500(pre 2001) 30.0 HP
Sportsman 500 H.O. 35.0 HP
Sportsman 600 38 HP
Sportsman 550 XP 40 HP
Sportsman 700 43 HP
Sportsman 700 FI 44 HP
Sportsman 800 50 HP
Sportsman 800 H.O. (06-08) 55 HP
Sportsman 850 XP (pre '12) 69 HP
Sportsman 850 XP H.O. 77 HP

 

So my 96 sportsman 500 has 5hps less than my 97 sportsman 400. Anyone know the weight for them? Am selling 500 haha man need to make a thread for mods

 

Seems there slug brown in top end am guessing water pump seals. Compression was 150. Thinking they sink it? Going to break motor down. Replace seals and gaskets see where am at then.

New to 2stroke but my friend works on dirt bikes so with both of us should be able to figure it out. Other polaris was camshaft and exhaust rockerarm so I order new part numbers.

 

490 pounds Scrambler 400, 640 pounds Sportsman 500. Look at the 1st chapter in your manuals under General Information!