help fix trenching

[rmk727]

Please help!! As a flat lander what do I do to stop trenching? On D8 155 w/ 300 # rider, BMP pipe mod, Carls clutching, 19/42 gears, all the mountain stuff plus rider is very good and experienced in the mtn's I need to know how to help with set up for deep snow, limitor straps ,front shock position, what rear springs or switch skids, more pressure in rear shocks, ect , has Simmons gII skies with 220 #'s pressure in front shocks, Thanks in advance

 

[milehighassassin]

Try tightening your limiter strap.

 

[xsummit]

Trenching

When you say trenching, are you referring to getting stuck in 3 ft of fresh or are you referring to spinning until you hit dirt in the ditch? Trenching in the mountain powder IMO, is caused by a few things. 1.Too short of Track 2. Too small of lugs on said track 3.Incorrect clutching.
Changing you front track suspension (shortening your limmiter strap) won't do you any good if you are 300#s and ride a 155 in the steep and deep

hope this helps

 

[thefullmonte]

You might try laying the front shock down in the lower position and letting his limiter straps out. Gives you a better approach angle and helps the sled get on top the snow easier.
He will be needing the stiffest springs for sure.
The other consideration is his clutching. I'm not sure what exactly comes in the Carls kit these days. I think they may have been using the belly busters. If these have too harsh of an engagement you may need to do some changes. Maybe just a primary spring with less pre load to smooth out engagement. Possibly a 120-340 or something in that range.I think the secondary helix was really good in that kit.

 

[allblowdup]

I always tighten the limiter strap up to the top and lay the shock down. Polaris really screwed up when they made the chassis. They have way to steep of attack angle. I get why they did it but it is just a crappy thing to do. They wanted the sled to pick the ski's up quickly for getting over things and coming out of the snow quickly at low speeds. Only problem is that at higher speeds the snow is hitting the wall of an approach angle and the sled either way to high out of the snow and it starts to trench or it just moves slowly. I lowered my chaincase on my 05 900 and did some back to back climbs with another 900 in loose snow and it was unbeilevable. my sled was better in control climbed way farther had better speed and did not trench. Another side benifit is also way better top speed on the flats. We saw some of the same thing with edge chassis. By the time you lost a bunch of weight with the pipes and gained the power you had to chage the balance of the sled or it just be skis in the air everywhere. So we started loweering the chaincase and putting on ten tooth drivers then moving the suspension back 2" and putting big wheel kits on. it was a completely different sled. Great trail manners wicked in the deep snow and stupi fast accross the lake. I hope that the new rush/RMK has a better approach angle or I am going to have to modify it.

 

[srosscojw]

Ideas

Holz rear skid and camo xtreme 2.5" track should work.

 

[trench]

Use momentum , everything trenches...

Momentum will be your friend .

Momentum = pin-it before trouble .

Momentum = speed

No momentum = trenching

Hope this helps...

 

[diamonddave]

1st Fix...Ron's weights with Carls Helix. Common complaint with the belly busters is trenching. 2nd Fix...replace the garbage track! 3rd fix and the cheapest...learn how to ride.

If he wants the premo set-up...Holz skid, Drop n Roll, 2.5" track. Being 300#'s, this may be necessary.

 

[tree climber]

or roll snowmobile on its hood and use the track for a treadmill haha. i kid

 

[rmk727]

it's so hard to roll it over when all u can see is the ski tips, How do ron's wts help?

 

[rmk727]

Also Dave u may be thinking of 300# 5ft 10" but he's 300# 6'6" and built like a linebacker and athletic plus is a quite good rider

 

[milehighassassin]

300 lbs is 300 lbs. Either way you look at it, it is a lot of weight for a machine.

 

[deepdiver]

change the approach angle. drop and rolled chaincase.

Also when you are climbing that is a lot of weight on the arse end of the sled. I am 6'3"@245 and my riding partner is 6"3-4@285...we know the feeling.

 

[440dart]

174 worked for me haha get rid of the garbage track put a camo ex on best mod you can do to a polaris besides turbo or turbo plus camo well it gos on and on

 

[polaris dude]

haha i think once you reach the 300lbs area your ability to complain about a snowmobile not being able to lug you around very good is void. For me being only 150lbs i can't get my suspension soft enough for me to properly work it. I can't just blame polaris about it cuz they didn't make it possible for me to soften it far enough, i just gotta gain some freakin weight or throw a couple of sandbags on back
So, if you do the opposite of what im doing i think we will both be golden

 

[rmk727]

ya but when you see these tall guys carving it is so easy for them compared to us regular they just lean over with the weight being so high he just trenchs alot climbing , thanks all for you info