04 800 HO way over geared, Am I readind this right? Options

[SGOODRIC50]

These are my results on my 03 800X BONE stock except gear and beavertail delete. With 2500 miles 1.25 track, 144 studs, 600 belt, and 440X handlebar kit.

26/43gear ratio = 98MPH (1000 ft.)
25/43gear ratio = 100MPH (1000ft.)

26/43gear ratio = 99MPH (1/4 mile)
25/43gear ratio = 101MPH (1/4mile)

I have never been clocked in a one mile stretch, however, I have raced a 2003 F7, 2003 ZR 900, 2001 ProX 800, and 2003 REV 800 (stock gear ratios) with both gear ratios in over a mile with these results:

26/43gear ratio = Beat only the 2003 REV 800 (because I had a better start)
25/43gear ratio = Beat all of them from stop to finish.

[mps1168]

I cant wait til my gear gets in. Going from 26/43 to 25/43. Already have Cudneys Kit...Im so excited!


Keep the rubberside down..............mps

[BIG JOHN]

I run 22/43 or 23/45 in my Renegade- 110 mph on hard packed lake- quick too (even with me on it-LOL)-BJ

[Dynamo^Joe]

One thing you will find from gearing down a substantial amount to measure, and I don't mean one tooth, I mean two teeth or more will make a substantial difference that you can feel in the seat-o-pants...
...The effect gearing down has on flyweight; Gearing down gives flyweight the motive to act like a heavier mass than previous gear. The fact is the C of G of the flyweight is now at a farther relative position away from the clutch shaft centerline per mph/shift position on the shift curve.

For lack of better numbers lets use 90mph and pick the difference between 23 gear and 25 top gear.
*Where is the belt centerline on the primary at this steady mph?

At previous gearing [25] the belt centerline and the center of gravity position of the TRA arm is lower and closer to the clutch shaft or if you like..the engagement position. When depressing the fuel to accelerate, you'll find the engine will shift at whatever rpm and peak at the proper rpms.

With the newer lower gear [23] the belt centerline and the center of gravity position of the TRA arm is higher and farther away from the clutch shaft or if you like..the engagement position. When depressing the fuel to accelerate, you'll find the engine will shift at a lower rpm than the 25 gear and the peak rpm will be slightly less than proper rpms. You could lose 100 rpm or more because the weight is heavier and pushing harder at the 90mph speed.

Now there are a few advantages to this. From rest, as the sled speed increases, what inevitably follows is the flyweight does more work. The primary will capture slightly more the "meat" of the torque curve, especially on trail where you are on and off the gas somewhat. The weight is taking advantage of a cooler exh pipe which some know that a cooler pipe makes more torque at lower midrange rpms.
I always get nearly the same comments that tuners can get a higher mph cresting the top of a hill and holding the skis in the air longer up hills. More bang going over the hill and especially when letting off the fuel to go thru the bottom safely, they ascend back up another, the engine is right there with improvement to get to peak rpms.
And nearly always recording the same top speeds on hardpack light loaded road conditions.

[Dynamo^Joe]

These two I had to add about a gram of flyweight to push the secondary open to get my top end back.
[2.38] 18/43 = 81, 82 mph [geared for 76] got into overdrive
[2.44] 18/44 = 81, 82 mph [geared for 74] got into overdrive

You will notice here that I mentioned I had to add a gram of flyweight. I lost mph originally with this gearset. I also noticed that on prolonged running with this my secondary temperature was higher than normal. I would stop suddenly, pop the hood, measure as close to the center of the sheaves on the secondary. The temperature was higher than previous gears. If there is higher temps, then what is happening? Belt slip. At that shift ratio there is not much belt contacting the surface of the secondary sheaves. The arc angle of contact is low in overdrive, so the sheaves could not do their job of gripping the belt. I ended up increasing my pretension from 19 lbs to 23 lbs, ran and retest, recorded increased rpms because of pretension change. I added nearly a gram to push the engine back down and reveal an equivalent mph to the latter gear ratios.
Now with this addition of flyweight it does not make hardly a difference at all in the lower shift ratios because the TRA arm C of G is close to the clutch shaft center. However that little bit of 10ths makes a large difference at full shift. Remember the force is squared at the rpms.

[GadeX]

For those with a gade.....
I Asked my dealer and without hesitation said drop the top gear 2 teeth,
without even knowing what the gears were.
Opened it up, 23/43 stock, went to 21/43.
Then we noticed I hadn't been using all my clutch, had 18 hours at that point,
getting my check up.
Took it for a rip, wow, I was already impressed to that point,
but this just blew me away?!
Couldn't get my head around it for a bit but as explained here earlier,
the smaller gear can do more - faster.
It gave me more "yank" and decent top end, 105 radar on ice.
I'll let the triples fight it out on the lake.
It's the trails where it really shines.

[MountainMax]

U say that you had a 23 tooth top gear stock...I thought those sleds came with a 22 top stock...that is what mine had in it...I am going to a 21 though Now I think..

[rake1]

Gadex
You mentioned you went to a 21 top gear I went to a 22 on my gade same top end but was wondering if you could use the same chain as with the 23 tooth.It looked like I was getting close to the end of the adjustment.

[rake1]

Yea joe I am using your kit and it is working great especially on the trails always right there and a lot of fun.I am still waiting for more weight from thunder so I can set it up on clicker # 3 as I am using #2 right now.I figure 25 to 26 on # 3 should be just right for 8000 rpms(hitting about 8250 now on #3). With the weight and on #3 do you think it will pull harder? As for the 7 cat he hit a ditch last trip out chain case gone AGAIN $300.00 to fix it this time.I don't think he is going to keep it together long enough to try himLOL.

[REVBOB]

Mountainmax, You have a 1.75" track if I remember, stock was 22 top with that track. Thats what mine came with.

[cokeman]

Has anyone went to 21/43 on gade? willit work with same chain.

[MountainMax]

next time my sled is in for work my dealer said he was going to put a 21 tooth in to see if it will help to keep the belts on longer...he said the same chain will work....and I have had a 24 tooth on also with the stock chain.

[11c]

This is a great topic guys....so I sighned up for the Dootalk forum!!
I am also currently running the 25/45 in my 800HO w/1" track, it seems to pull harder but I am going to go all the way down to 23/45.
My top speed on the LCD speedo didn't change going from the 26 to 25 on the top gear on hard pack so well see this weekend how the 23 pulls.

Anyone else try a 23/45 on a 04' 800 ??

[skiform]

YEA, I HAVE THE SAME QUES. ON THE 23/45 ,SOMEONE PLEASE

[Revtuner]

Im gonna run 22/43 and 22/45 this weekend for some solid testing on the paragon.