Buddy is a X polaris mechanic says the work well and clean up the bottom end.
They are a black rubber flap deal that sits next to the reed stop.

#18



http://partsland.com/index.cgi?N=114347844...LINDER-MANIFOLD

My guess is that it would hurt high RPM power. You've got to remember that those watercraft 700s only spin to just over 6000 rpm, so they dont need the high rpm breathing that an 8000 rpm sled motor does...I think they are roughly 85hp, IIRC.

My 96 hurricane was 93 hp and ran at 7000 rpms. My buddy is running it in his 700 as we speak
In 660ft he could run 93 mph on his 98 xc700 with 220's.

Says it allows the fuel to go directly into the crankcase instead of piling up at the end of reed block.

For $7x4 of them. I will try it. I have pissed more money away on gimicks that didn't work before.

I heard they were on the xc 500's for awhile.

They are on the bottom only on a 00' xc 700 also.

http://partsland.com/index.cgi?N=114348224...-XC-SP-CYLINDER

ive seen those on something ive owned before, but im having ahard time remembering what it was, it might have been a RM 125

Dont you guys think if it added HP Polaris would have put them in right out of the box....... I think the post from Polaris nut has hit the nail right on the head, more power in the midrange.... sleds have cvt clutches and as soon as the flipper is hit the motor goes right to peak power in one second.

My 1998 XC700 has them also, stock item, p/n 5411251 STUFFER

The 700 crafts I've seen never spun quite that high, but regardless, its not 130hp@8000 like the snowmobile version...thats still quite a difference in airflow...there's no way fuel is going to pool at the end of the reed block at 8000. My 660 gained power when I pulled the reed block stuffers out and ported the boots...At max rpm, you need more intake area than stock, not less. Not trying to knock down your idea, just think you may cost it some peak power, but hey you never know...

I know and see what your saying. The hurricane was a higher hp model than the base sl's.

My buddy drag races in the "stock" class with his 98 700 with them in.

I will try it out next year and let you know.

I know of a few people that used them with success the thoery is it helps get rid of dead air space and effectively makes the crankcase area smaller which equals more pressure in the crankcase and pushes the gas thru the ports with more force.

The stuffer takes up crankcase volume which in turn increases primary compression. It helps low/midrange power but has a negative effect on top end power.

I ended up using them. Fuel economy seemed to increase during trail riding (11-12 mpg).
Seemed to have more snap down low. Top speed was still the same around 100 mph on packed ground.
So for the most part they worked.

Added tempaflow so I am shooting for 14-15 mpg. It maybe a stretch but worth a shot.