Tomas.

For belt to sheave clearance, if I am measuring correctly I think it is around 0.02-0.03

The belt is a brand new polaris 115 with just testing in a field by my house. The belt sits just above the secondary. Does not slam into engagement.

I don't have the tools to pull off the spider. But when I have the cover off, the rollers appear to be in good shape, weights are new with no slop, buttons seem decent and the sheave seems to move without restriction.

My injectors have never been tested. This is my third season with this sled and I don't put a lot of miles on. (Hopefully I will put in a lot more this year). It has always been like this but last year is when I really noticed because I actually rode with someone and was on a lake where I could really stretch it out. Season before I was just on little bush paths so I wasn't aware of my shit top end. My primary looks like this with either of the 10-62 or the 10-64 weights. I have also changed my spring back to a wore stock rmk spring and same results. The picture with both clutches in it is from yesterday with the 10-64 weights and the 150/340 spring. The stock rates are 120/340. The other is with 10-62g weights and the 140/330 stock rmk 700 spring.

It is posted in the general snowmobile section.

So basically my issue is my switchback back is painfully slow. I am only able to get 68 mph out of it. Has a respectable amount of bottom end but nothing up on top. It has been stretched to a 144" with 2" paddles. Gearing is a 21t top and a 40t bottom. Primary clutch has 10-64g weights (currently sitting at 2,200ft) but I started out with 10-62g. Both sets of weights are brand new. With the 10-62 weights I was hitting 8200 rpm and with the 10-64's I managed 7900 rpms in poor conditions (low snow) I have a venom products lime green primary spring 150/340 which is new. Secondary clutch has a new venom products spring red/black 140/240 (stock rate). Helix is the stock 42 straight. 120psi on both cylinders. Exhaust valve/bellows are clean and in good condition. Reeds and intake boot were replaced 750ish kms/two seasons ago. Oil filter and fuel filter have also been changed 750ish km/two seasons ago. Every single idler wheel bearing in the skid has been changed maybe 500 kms ago or last season. Track was aligned and tensioned this season. I am basically at my wits end. The only things I have left to try is a 56/42/36 helix out of an rmk that I have currently installed in my secondary but have not had the chance to test it and I have some 20/41 gears from an rmk I can swap in. According to the polaris gearing chart, on a stock track, I should be good for 93mph. I know the longer paddle track will take away top speed but take so much away that it falls on its face above 50 mph? I have a 2007 arctic cat 600 crossfire 136"/1.25" as well for the other half and I raced my buddy last year across a lake. He was on my crossfire and I on my switchback (with the 10-62g weights at 2,200ft). He absolutely embarrassed me. It was awful. The video is with the 10-62g weights and the stock 42 straight helix. https://youtu.be/F2cFCZ6ZHgE

Perfect! I have a 2008 polaris switchback I am struggling with. Maybe you can shed some light on my issue!

Perfect. It is funny, I became an HCS member last night looking for tech help with my sled. It was suggested by a guy at tbp. Now HCS is coming here and the circle continues lol

So I found a set of 10-64g weights brand new for $50 cad. That is a pretty good deal lol. So I am going to toss those in tonight but won't be able to do anything testing till more morning/afternoon. I was also wondering about secondary helix's. I tried to do some research but I wasn't finding oust anything. So my 08 700 switchback has a 42 straight helix (factory). I have a 56/42/36ER helix lying around. Does anyone know what switching to that multi angle helix would change? The helix is coming off an 08 rmk 700 155". My SB was a 136"/1.24" track from factory but has a 144"/2" on it now. I am still not riding the mountains but would I benefit from an rmk multi angle helix for my longer/larger lug track ?

........ I did........ Lmao Well I pulled the cover off the primary. I changed the spring and weights and cleaned everything I could as I don't have the tools or know-how to go further. On the secondary I had it all apart, changed the spring and added the washers, cleaned everything and reassembled. It has the stock helix as far as I know. They only things that are not factory are the primary spring (went from a 130/340 to a 150/340) and the weights. The factory spec weights are 66g weights for 0-2000ft. When I got the sled it was running 62g weights so that's what I put in it when I changed them.

Is this a weight issue, spring issue, or bring it to someone else issue lol.

I just did a compression test and was getting 120psi on each side

Here is the result of the marker lines on my clutches

The video finally uploaded. When the camera starts, I go down a hill, up the other side and across the field wide open. I turn around and go back to my initial start point less aggressively. Then I do it again but with my gauges swapped. After that field crossing, I am riding the ditch till I get home.

That pictured turned out like crap. Here it is again but from my computer so you can see both lines.

I have an ultimax xs809 which is listing for my sled. I should be ok there.

I believe so. I am running an ultimax belt that I got from the local shop. I will double check the numbers to confirm

Pulls really well the whole way. Probably because it's the beginning of the season and I'm riding in fields and not on a lake, but it seems really fast until you look down in the speedometer and realize it's only 67 miles an hour. Last season I was out on the local lakes and I had my buddy with me who was on my 07 crossfire 600. I was tucked behind the windshield had the throttle to the bar for as long as I dared and he just comes strolling up beside me and leaves me in the dust effortlessly. not the best thing in the world when I bought that 600 for my wife who's an extremely novice Rider to say the least and I was looking for something that was super reliable and not over the top fast. Just to have it make an absolutely mockery of my 700

Thank you!!!