Gear change in a 900 1M

[Repoman]

I bought my 900 1M for off trail use and would like to know what problems I may cause by putting ZR 800/900 gears in it.

When I ride trails I use ice scratchers and also trimed the track to 2" on a 162". Ported the track to get some more snow to the hi-fax.

On trial I get about 90mph and would like to hit at least 100mph. Can the track handle it if I can keep snow on her to cool it?

I am always last to the new spot when we run trials in between area.

Thanks

 

[AirForceSledder]

I bought my 900 1M for off trail use and would like to know what problems I may cause by putting ZR 800/900 gears in it.

When I ride trails I use ice scratchers and also trimed the track to 2" on a 162". Ported the track to get some more snow to the hi-fax.

On trial I get about 90mph and would like to hit at least 100mph. Can the track handle it if I can keep snow on her to cool it?

I am always last to the new spot when we run trials in between area.

Thanks

If Yer looking for speed, get a ZR. Or older ZRT. otherwise get the 900 respectivly. If you are looking for both, get the Crossfire. Thats what they are made for.

 

[Repoman]

PLEASE

I would really like my question answered more than what sled is best for what you think I need, please.

A person can go around and around on what sled should be used for off trail.

 

[AirForceSledder]

Sorry, You're right.

 

[Zip]

you will need to re clutch and you probably wont gain much topend bet lose a ton of bottom end.The 900 takes 70 p chain and the zr takes a 72p chain so its like gearing up 2 teeth.Personally i think its a bad idea but its your sled so good luck.

 

[rossg12345]

gear change

I did a gear change on my 2003 900 mt. cat it and helped me keep up with my buddies and did not hurt a thing in the powder. If you want the exact clutching and gearing I did let me know. I ride it at 0 to 3000 and in the mts at 8000 to 10000.

 

[1Mike900]

Use the low elevation recommendations on the clutch cover and add about 1 gram to what it says for clutch weight. If it is a later model sled you should be fine with the ignition advance, 03.5 had the hotter advance thru the mid-range beyond the ZR's. Good reeds and a snorkle airbox should help. Run ZR needles inplace of the Mtn. cat ones. That is a lot of track to get spinning would be better if 1.75" lug. as you will have less reciprocating weight and less air volume movement! To me this is dangerous if you are seeking to run sustained speeds of 80+ on a long track with 3.00 pitch one track stab and it is all over with. I would run 10 tooth involutes with a anti stab kit at the least. I am surprised the machine has lasted this long at the speeds you are talking about. I would look everything over very carefully like driver bearings, skidframe and most certainly the track! Make sure the A-arms aren't cracked by the welds and tie rod end bearings are checked and replaced more frequently. Remember you are traveling at over 140 ft. per second and s--t can happen!

Good luck

 

[fishtank]

I was gonna say, you must have some well groomed trails to be running at those speeds. 90mph is not fast enough, jeez! Id be lucky to get it to 60mph on some straight parts of the trails here. Most are bumpy as all hell.

 

[Repoman]

We'll there are alot of guys with newer F8's that just because they can beat me with their 121" sleds, think mine sled is a piece of crap. But when I ride past them and they are standing in snow up to their waist trying to dig out thier sled they just flip me the bird. I am getting older and do not like to get all sweaty, out of breath and then get cold. That's not fun to me anymore.