Gerbil's new sled wasn't running up to snuff on our first test and tune ride. It was a real dog at engagement up until 5,000 RPM. It would accelerate slowly up to 5K, then after a few seconds of being slow and crappy it would just take off on the top end like a Sasquatch was chasing it! Not a very good setup for a boonditching sled. Gerbil managed to get stuck three times in 25 miles, and we don't really have any snow! A sled that bogs on takeoff so you have no groundspeed and then unexpectedly revs hard enough to trench you to China is a real bad combination.
DCUBA doesn't know much about clutching. You'd probably have better luck hiring a wizard to cast a spell on your clutches than having us tune them, but we attempted a fix anyway.
Gerbil said his secondary was surprisingly easy to twist for belt removal, so we decided to start there. Our amateur logic was that if the secondary was soft, the sled would shift up too quickly causing the bog. Also, the secondary is the easiest to remove so we wanted to try that first. We took the clutch off and dissembled it using my awesome woodworking clamp clutch tools. The spring was in hole #1, the helix had weird wear on one ramp, and the super unslippery buttons didn't look too great. Gerbil shined everything up and I sprayed lots of my favorite graphite drylube all over everything except the sheaves. We put the spring in hole #3 and reassembled.
Today was test and tune volume II, and we hit the proving grounds with bated breath. What was the result? Same bog, the sled seemed to hang at 5,000 for a few seconds before taking off, and now the sled over-revved by 300 RPM. Great. Exactly what's supposed to happen when you move the secondary spring two holes.
I noticed that the sled was engaging at 2,800 to 3,000 RPM. Gerbil said he thought it was 3,500 RPM, but we agreed to disagree. Even at 3,500 it seemed a little low since I think mine engages pretty close to 4,000. Our pea brains started spinning and we came to the conclusion that only the primary clutch has anything to do with engagement, so we took that off.
In my past experiences, logic has absolutely nothing to do with troubleshooting a piece-of-shit sled, so we weren't confident we'd find the problem in the primary, but we did have hope. We popped the cover off the primary and what did we find? Looked a lot like a broken primary spring:
Well, even a blind squirrel finds a nut now and then! We threw a spring from my boonditcher pro in there, and we'll head to the proving grounds to test it tomorrow. Anyone care to predict the outcome? DCUBA says it's gonna rock!
Here's a bonus picture I just ran across on my camera. DCUBA doesn't know clutching, but we DO know getting stuck!