Heimie
Active VIP Member
Alright everyone, here is a bit of a long one, and a head scratcher. I'm hoping someone on here can help me out. And I don't need to hear any "should have bought a doo" comments. Just genuinely looking for help on the Boost.
2025 Boost Pro RMK (not Khaos), 165"x2.75". Before I even rode the sled, added MBRP race pipe downstream of the turbo, and the Carbon Sled sheave connector. That's it. Rode in the mountains, garbage snow the first day, then 2ft pow the 2nd day, and put on about 125 kms.
Got home, installed Ibexx Gen 2 clutch kit (primary spring, slip washers, primary weights loaded 1-1.5-2-1, secondary spring, secondary roller bearing, helix), and the TRS Powervalve in the airbox.
Now we are in Allan Creek, the first half of the day it was great, although touching 8700 rpm. Then it started feeling like it was spinning the track everywhere, trying to get going and not hooking up well in the snow. Rode my 2 buddies' G5T Doos, and they just dropped the track, dug in and launched. Tried to replicate with the Boost and just felt like spinning the track on hard pack, would not hook up. Then I noticed, and this is where it got weird, it seems like the belt is slipping. Now I tried to pay attention the first day and it was hard to, as I only noticed near the end of the day. I talked with my clutching guy when I got back to the hotel, and we decided to load the weights 1-2-2-1 that night. Also changed to the properly broken in spare belt.
Next day, Chappel trail, and the first 2 corners the belt is slipping. Now I REALLY paid attention to what was happening and here is the best description:
Between 20-30 km/h it will consistently slip the belt, starts at about 5000 rpm, revs to about 6200, then drags down to 5200 and pulls your arms hard. Think of it like riding the clutch in a standard. It doesn't matter about going uphill, downhill, powder, hard pack, trail, parking lot, anything.
When I got home, talked with the clutching guy again, and changed the secondary spring back to stock black/purple, and weights were loaded 2-2-1-0. Still slipping the belt like it was on the mountain, although I'm doing this in my yard on my acreage. So, now, I have returned to 98% stock. Stock primary weights, stock springs, stock helix. Kept the slip washers in the primary, and roller bearing in the secondary, Carbon Sled sheave connector still on. Again, slipping the belt exactly the same. So now, I pulled the TRS valve, factory airbox reeds. Still slipping the belt (I know, this was a hail Mary and the airbox valve should not affect the belt slipping, I was just grasping for anything). But now that it's all back to mostly stock, am I losing my mind??? Did it always do this and I didn't notice??? I'm pretty sure it didn't. But now I'm second guessing....... Tomorrow I want to remove the slip washers, roller bearing in the secondary, and sheave connector, change to the spare belt again after scuffing it up and scotch pad the sheaves. See what happens.
My questions to all of you are:
Has anyone experienced anything like this?
Can anyone try riding their stock or even clutched Boost and try to replicate this?
Like I said, 20-30 kms/hr it revs up, then grabs, drags the RPMs down, and tries to pull your arms off.
Super frustrated.
2025 Boost Pro RMK (not Khaos), 165"x2.75". Before I even rode the sled, added MBRP race pipe downstream of the turbo, and the Carbon Sled sheave connector. That's it. Rode in the mountains, garbage snow the first day, then 2ft pow the 2nd day, and put on about 125 kms.
Got home, installed Ibexx Gen 2 clutch kit (primary spring, slip washers, primary weights loaded 1-1.5-2-1, secondary spring, secondary roller bearing, helix), and the TRS Powervalve in the airbox.
Now we are in Allan Creek, the first half of the day it was great, although touching 8700 rpm. Then it started feeling like it was spinning the track everywhere, trying to get going and not hooking up well in the snow. Rode my 2 buddies' G5T Doos, and they just dropped the track, dug in and launched. Tried to replicate with the Boost and just felt like spinning the track on hard pack, would not hook up. Then I noticed, and this is where it got weird, it seems like the belt is slipping. Now I tried to pay attention the first day and it was hard to, as I only noticed near the end of the day. I talked with my clutching guy when I got back to the hotel, and we decided to load the weights 1-2-2-1 that night. Also changed to the properly broken in spare belt.
Next day, Chappel trail, and the first 2 corners the belt is slipping. Now I REALLY paid attention to what was happening and here is the best description:
Between 20-30 km/h it will consistently slip the belt, starts at about 5000 rpm, revs to about 6200, then drags down to 5200 and pulls your arms hard. Think of it like riding the clutch in a standard. It doesn't matter about going uphill, downhill, powder, hard pack, trail, parking lot, anything.
When I got home, talked with the clutching guy again, and changed the secondary spring back to stock black/purple, and weights were loaded 2-2-1-0. Still slipping the belt like it was on the mountain, although I'm doing this in my yard on my acreage. So, now, I have returned to 98% stock. Stock primary weights, stock springs, stock helix. Kept the slip washers in the primary, and roller bearing in the secondary, Carbon Sled sheave connector still on. Again, slipping the belt exactly the same. So now, I pulled the TRS valve, factory airbox reeds. Still slipping the belt (I know, this was a hail Mary and the airbox valve should not affect the belt slipping, I was just grasping for anything). But now that it's all back to mostly stock, am I losing my mind??? Did it always do this and I didn't notice??? I'm pretty sure it didn't. But now I'm second guessing....... Tomorrow I want to remove the slip washers, roller bearing in the secondary, and sheave connector, change to the spare belt again after scuffing it up and scotch pad the sheaves. See what happens.
My questions to all of you are:
Has anyone experienced anything like this?
Can anyone try riding their stock or even clutched Boost and try to replicate this?
Like I said, 20-30 kms/hr it revs up, then grabs, drags the RPMs down, and tries to pull your arms off.
Super frustrated.
