BigDog05
VIP Member
05 Rx-1, Stock Track, 192 gold diggers, 2200-2800 ft elevation. I weigh 220 W/O gear.
Original clutch with 8-10 lbs of boost was a Bender Heel Clicker set up.
40-10Y clickers, 5.6 in heel, 5.6 middle, 3.4 tip, white clicker primary spring, white/blue (Bender) secondary spring @ 30. Bender Helix, marked 03-RX-1 (53-45 I think) Engaged @ 4400-4600 RPM, shift out at 10200-10600 RPM depending on 8-10 lbs and conditions.
Sled only took about 1.5-2 sled lenghts to build boost and ran fine.Felt like a stock RX-1 until boost.
I took the clickers out because of the high engagement for trail riding and because of all the stories about them coming apart.
Now to my problem. I'm running a CPR Heavy Hitter clutch kit. 62.8 gr arms, 3/4 allen in heel- 3.4 gr., 7/16 bolt 4.2gr., with .4 gr thin brass washer in #2 and #3. Stock Y-S-Y primary, and silver secondary @ 100, or the white secondary @ 60. Neither one seems to make any difference on holeshot. The helix is marked 5 degree special.(angle???) 12 lbs of boost
Engagement with 3/4 allen in heel is 3300-3400, with 1/2 allen in heel engagement is 3500-3600.
It has a slight bog on holeshot and takes about 50-60 ft to build boost and then it picks the skis up and pulls great. Shift out is around 10300-10600 depending on conditions,
From a 15 MPH or faster roll off its pulls great, it just won't pull this set up without boost, and takes long to build.
Do I need a different primary spring for higher engagement, or different helix, or something else?
Thanks in advance, John
Original clutch with 8-10 lbs of boost was a Bender Heel Clicker set up.
40-10Y clickers, 5.6 in heel, 5.6 middle, 3.4 tip, white clicker primary spring, white/blue (Bender) secondary spring @ 30. Bender Helix, marked 03-RX-1 (53-45 I think) Engaged @ 4400-4600 RPM, shift out at 10200-10600 RPM depending on 8-10 lbs and conditions.
Sled only took about 1.5-2 sled lenghts to build boost and ran fine.Felt like a stock RX-1 until boost.
I took the clickers out because of the high engagement for trail riding and because of all the stories about them coming apart.
Now to my problem. I'm running a CPR Heavy Hitter clutch kit. 62.8 gr arms, 3/4 allen in heel- 3.4 gr., 7/16 bolt 4.2gr., with .4 gr thin brass washer in #2 and #3. Stock Y-S-Y primary, and silver secondary @ 100, or the white secondary @ 60. Neither one seems to make any difference on holeshot. The helix is marked 5 degree special.(angle???) 12 lbs of boost
Engagement with 3/4 allen in heel is 3300-3400, with 1/2 allen in heel engagement is 3500-3600.
It has a slight bog on holeshot and takes about 50-60 ft to build boost and then it picks the skis up and pulls great. Shift out is around 10300-10600 depending on conditions,
From a 15 MPH or faster roll off its pulls great, it just won't pull this set up without boost, and takes long to build.
Do I need a different primary spring for higher engagement, or different helix, or something else?
Thanks in advance, John
rxrider
Jan-Ove Pedersen
- Joined
- Apr 25, 2003
- Messages
- 7,355
- Reaction score
- 64
- Points
- 1,753
- Location
- Lakselv - 70N & 25E
- Country
- Norway
- Snowmobile
- 2014 Phazer XTX, 2013 Phazer RTX, 2008 Apex RTX, 2007 Warrior, 2006 Attak
My engagement is 4500 with the 60 grams Supertips loaded to 77.7 grams. I have a MCX rearmount, and like your sled did with the HCs, it will build full boost within 5 meters or 15 ft. I ran the STs with 14 grams at the pin, take off rpms were 9200-9400. I took out 7 grams at the pin leaving everything else the same, now take off rpms are 9800-10000, much better 
. Now I have to deal with a 11000 rpms overrev situation when the turbo power kicks in spinning the track out
I would try going up in spring preload some while keeping the same end load. Take off a little weight at the pin if the higher spring preload does not get you there.
Do you have a WBO2 meter? You may have a lean bog on take off. When I rev my sled up to take off it is lean until past 4000 rpms, 14.0 AFR, dropping to 12.5 AFR at 4500 rpms engagement speed, no bog on take off. Just a thought.
. Now I have to deal with a 11000 rpms overrev situation when the turbo power kicks in spinning the track out I would try going up in spring preload some while keeping the same end load. Take off a little weight at the pin if the higher spring preload does not get you there.
Do you have a WBO2 meter? You may have a lean bog on take off. When I rev my sled up to take off it is lean until past 4000 rpms, 14.0 AFR, dropping to 12.5 AFR at 4500 rpms engagement speed, no bog on take off. Just a thought.
BigDog05
VIP Member
Yes I have a wide band 02. I put this clutch in last season and it was better, but not as good as the HC's.
Last season I was running 20 pilots at 2.25 turns, and this year I'm running 17.5's at 2 turns. It did seem to launch better last year. But with the 20's it was rich at slow trail speed.
Do you think with a rear mount, that you have to launch at 4200 or more to get the sled to boost?
Last season I was running 20 pilots at 2.25 turns, and this year I'm running 17.5's at 2 turns. It did seem to launch better last year. But with the 20's it was rich at slow trail speed.
Do you think with a rear mount, that you have to launch at 4200 or more to get the sled to boost?
rxrider
Jan-Ove Pedersen
- Joined
- Apr 25, 2003
- Messages
- 7,355
- Reaction score
- 64
- Points
- 1,753
- Location
- Lakselv - 70N & 25E
- Country
- Norway
- Snowmobile
- 2014 Phazer XTX, 2013 Phazer RTX, 2008 Apex RTX, 2007 Warrior, 2006 Attak
BigDog05 said:
I have tried the 22.5 pilots on 2 turns out, 1.5 turns and 1 turn with both Hotzman green spring and stock springs. Good response down low on cold days horrible on warmer days. For dragracing big pilots works, for trialriding it doesn't. When trailriding it would go low 11s AFR and load up the motor if riding slow in less than a mile. No good for trailriding. I went with 17.5 pilots, screws at 2.25 and stock springs, now response is good also at -5C or 23F, still a little fat down low, mid 11s AFR, still loading up the motor if gong slow for a few miles. I'm now going with pilots at 2 turns, haven't been riding it yet.
When going up on engagement your turbo spins faster at take off and your rpms are closer to where the boost starts to build. Have been running springs with engagement from 3500 and up, I now run the Dalton Black/Green 57/129 primary spring, engageing at 4500 rpms. Works well in my sled.
BigDog05
VIP Member
rxrider: Thanks for the reply. I went out on Sunday with the following changes.
Moved the fuel screws to 2.5 turns from 2 and played with heel weight from 3/4 allen to nothing in heel. I definitely don't want to go any richer on pilots and screws. At 2500 ft elevation it is rich at slow trail speeds now.
Helped a little but I'm going to try the Dalton spring. I'm going to try an old set up that Ted posted some time ago, so I can stay with the heavy hitters for now.
His set up was for: Dalton spring, 60 gr heavy hitters, 3/4 allen in heel, 7/16 bolt w/thick washer in middle, and 3/8 bolt with thick washer in tip. Also the stock 51-43 helix with white secondary at 3-3.
I believe this is with stock rollers.
Moved the fuel screws to 2.5 turns from 2 and played with heel weight from 3/4 allen to nothing in heel. I definitely don't want to go any richer on pilots and screws. At 2500 ft elevation it is rich at slow trail speeds now.
Helped a little but I'm going to try the Dalton spring. I'm going to try an old set up that Ted posted some time ago, so I can stay with the heavy hitters for now.
His set up was for: Dalton spring, 60 gr heavy hitters, 3/4 allen in heel, 7/16 bolt w/thick washer in middle, and 3/8 bolt with thick washer in tip. Also the stock 51-43 helix with white secondary at 3-3.
I believe this is with stock rollers.
