As much as I hate to admit it, those F7's are FAST. I went up to Munising last weekend, and had the grudge matches with my buddy's machines. Here are the machines and their set-ups:

Mine: 2002 MXZ700, Goodwin Clutched, 2 teeth smaller on the top gear (so I think it's a 23). Stock 1" track (really .92") and studded. Machine was running good, but it overreving bad! I need to add more pin weight. I was pulling WAY over 8000 rpm, almost hitting 8200. I should be hitting 78-7900 on the top.

The 800: 2002 MXZX800, bone stock (he thinks), again with a 1" track and studded. He way overreving a lot too, but I don't know by how much.

The F7: 2003 F7 Sno Pro, Goodwin Clutched (actually one of the sleds they developed their kit with), a couple of small air box mods, stock 1.375" track and studded.

When I ran the 800, I came out of the hole a bit stronger than him, which surprised me since I outweigh him by 70 POUNDS! Anways, I pulled in front by about 1/2 a sled, and stayed there until about 80-85 mph, when he started to slowly pull away, which I would expect with the gear I have in there now. I am going to go back to the 25 tooth and see what happens.

Now, when I ran the F7, he hooked up like a mad man, and jumped out 2 sled lengths. I pulled him a little in the midrange, but could never catch him all the way. I outweigh him by about 40 pounds. Man, those things are fast. I could not run him down at all, and I could not believe how well he hooks up. As I am sitting there spinning, he is just pulling away. Even on hard pack, I can lift the skis a foot off the ground, but he still hooks up - it must be that narrow track.

While they never got a chance to run, I am sure the F7 will give the 800 a lot to handle. I am sure the F7 will get the jump and the 800 will play catch-up the whole way. Now, once he gets it dialed in?

For me, I need to figure out the pin weight issue and put some gear back into it!

Oh, I forgot... My buddy with the F7 will probably read this post, and give me $%&* for beating me in the grudge match, so I have to poke fun at him for getting the "BONEHEAD MOVE OF THE TRIP" award:

As we were heading down a moguled trail, he pulled off to the side because the thing "started to cut-out" and he lost power. Trying to restart the thing would cause it to tun for a second and then cut out again. He made the assumption it was the fuel pump, since there is a recall on the fuel pump which he needs to do the updates for. After fighting with it for a while, we towed him into the nearest bar. We then rode the rest of the way (17 miles) back to the hotel, got the truck and trailer and picked him up. He wanted to take it 200 miles to the dealership where he bought it the next day, but instead we told him to use the extra sled we brought along. That morning, we had to move hotels, and did so. At the next hotel, after messing with it another hour, including reaching into the gas tank to check it the valve had collapsed, it was still not fixed.

Then, we asked "Have you tried the tether cord?" I told him "Yea, my ski-doo will not run over 3000 rpm if it is not all the way on. It looked on, but it turned out it was not quite fully on. He pushed it on, and started on the first pull...

He was then awarded the bonehead move of the trip award.

Yes, "Barron Von Jiddru" my F7 is decent, but I must remind you that the distance was a lot more than two sled lengths, ahemmm. The TPI valves in the air box weren't even opened yet and the coupler blocks are set on number 3 (tighest) coupling. I never really looked at my tach, so I don't know if I was over-reving or not either and I hadn't played with the secondary yet. Your 700 is an excellent running sled, didn't finish 3rd in points in NSRA semi-pro 700 grass race class? I do look forward to a closer race other times out. Some times its hook up some times it hole shot and other times you are just out powered. Time will tell. I still win the a-hole of the weekend award due to the tether problem.

I still contend it was about 2 sled lengths. The time you gut in front of me, I had to hit the hooks or I would have been in your snow flap. I guess it's time to go on a diet! What's conventional thought, one hp for every 8-10 pounds of weight? No, I'll just strap the wife to the machine...its easier than the diet. :inlove:

jid ,are you running the adjustable pins?if so what screws are you running?have you had the tach calibrated?most are a little high and 80-8100 on the 700 is about right.you are 2 down on top,did you change the chain to the 74 link?I think that is too much I prefer the 25-43(stock) on my sled,the 25-44 that is in it now is ok for trails and pretty quick.I found the goodwin pin calibration to be off because of an over-rev as well.I run one short and one long,pulling about 80-8100 on top.as far as secondary I have the old style formula not the rer.I personally think your geared all wrong,because like you said at 85 your done.and with the stock gearing it is just as quick and faster up top.I will wait to comment on clutching after you answer my questions.my 700 will burn a stock 800 no problem.

I am only running the 23 tooth gear since that is what I ran this summer and fall for the grass drags, and I wanted to see how it was on the snow. I will be switching back to the 25 tooth gear for when I head back up north in a week or two. The 23 gives a great midrange snap for the tight trails, but you loose too much top end and poor fuel economy. I could not get the machine much over 100mph with that gear, and the last 5-6mph took forever. I think the stock gearing should workout better. I did notice about 1-2mpg mileage loss, and it burned a LOT of oil. I burned up an entire tank of oil in 320 miles. It never did that last year with the same brand of oil.

I did have to drop the chain 2 pitches. I went from a 74 to a 72 (or a 76 to a 74, I can't remember).

As far a clutch set-up, Goodwin's kit specs out a gold primary spring, and one long pin for the pin weight, along with their custom ramps. I thought it shifted out well, and the engagement was fine with the gold spring, but the motor was really overreving. I have to look and see what pin weight I have in there, I think I have one long and one short, but I will have to check tonight. I do think it is worth my time to calibrate the tach though, since it seem to be over by quite a bit. Plus, I think it needs even more pin weight, since changing the TRA's doesn't drop it by much. I tried dropping the TRA from 3 to 2 this summer, but it bogged out of the hole too much. I have the TRA's back in three, and just need to play with the pin weights now.

The stock clutching and gearing really wasn't that bad. In fact, for a stocker, I thought they did a great job, much better than the 800 clutching. You are right though, you can pull a stock 800 with the 700. Of course, once modified, there's no replacement for displacement. Hopefully, these changes will help me save face against that F7!

Originally posted by Jiddru@Jan 27 2003, 06:30 PM
You are right though, you can pull a stock 800 with the 700. Of course, once modified, there's no replacement for displacement. Hopefully, these changes will help me save face against that F7!
I will let the guys with the 800's I was with this weekend answer that one.

Hey, I just wanted to give you an update. Yes, both mine and my friend's 800 tachs were off. After having them tested, mine was off by about 100-125 rpm at 8000, but his was off 250 at 8000rpm! Well worth the $25 to find out where you are at before testing. I am going to change out the gear and hopefully get some testing in.

By the way, my buddy ran a few standard F7's with the 1" track, and he said they are much faster than his sno-pro version. He comes out of the hole better, but the smaller profile track is really faster than the 1.375" deep lugs. He also ran several REV800's and beat them easily, but I was not there to see how even they are (or are not).