Hustler 980 tall tub build

[dirtdobber]

Finally finished my latest round of fine tuning things and went for a ride Saturday. Everything worked well and the band chatter is almost gone. Replaced the green spring with a plain one and my top speed is up to a whopping 15 mph maybe.

The torque is amazing. My son was with me on a john deere buck 500 4 wheeler. Very heavy machine. He stuck it and I pulled it out with no effort at all.

When I finish the rear floorboard this build will be complete.

[Dw89xj]

Awesome!

[john swenson]

dobber...so to get the better torque you replace the green spring with a plain one . does that mean it's not any color ? is there green , red and plain ? j.b.

[dirtdobber]

JB there are several spring colors, from weakest to strongest is:
Plain
Black
Blue
Green
Red

The strongest spring (red) keeps the driven clutch from opening as easily, meaning it takes higher RPM and more force from the drive clutch to make it open. This "holds" the CVT in a lower ratio for longer and thus give you more torque, versus top end speed. So, when I was running the green spring, the machine was very slow, so I changed to a plain spring that allows it to shift sooner rather than later. Even with the plain spring I have more than plenty of torque.

[john swenson]

got it ....thanks, fortunately on my max 2 highboy i can easily just change the final drive sprocket to less teeth for a lower gear ratio . i need to see what my top speed now is. i don't care about going fast , but like the power , especially when running tracks . even if i'm left behind the group at busco...it only takes a minute to catch up to the first machine stuck in the mud !! j.b.

[dirtdobber]

Update on the 980.

I have been on a number of "test rides" over the last several months and I have never been happy with the speed, or lack thereof. In sand or semi soft mud I move along pretty slow, even at wide open throttle. No strain whatsoever on the engine. I got into some deep pudding mud and learned it will slip the belt rather than spin the tires...even with scoring the pulley sheaves for extra grip. Again, not a hint of strain on the engine. So, when I get time, I'm going to rebuild the drive clutch with some 109 gram weights and purple springs thanks to Roy at Quality Drive Systems.

Perhaps I'm mistaken, but with as much torque as I have, I should be able to spin the tires and sling some mud!

[john swenson]

happy to hear you are getting '' fine tuned '' just the way it works for you . j.b.

[ARGOJIM]

Update on the 980.

I have been on a number of "test rides" over the last several months and I have never been happy with the speed, or lack thereof. In sand or semi soft mud I move along pretty slow, even at wide open throttle. No strain whatsoever on the engine. I got into some deep pudding mud and learned it will slip the belt rather than spin the tires...even with scoring the pulley sheaves for extra grip. Again, not a hint of strain on the engine. So, when I get time, I'm going to rebuild the drive clutch with some 109 gram weights and purple springs thanks to Roy at Quality Drive Systems.

Perhaps I'm mistaken, but with as much torque as I have, I should be able to spin the tires and sling some mud!

At 15mph top speed, remembering that racerone3 posted top speed at 18mph, there is minimal top speed loss for the slower turning diesel. Ofcourse the diesel turns slower and differently than the gas. So that may just be what it is unless you drop sprocket teeth.
As far as wheel spinning mud slinging, you may never attain that but more of a churning and that may take time to get used to, you have to remember you have large biting tires chewing threw mud. As the big tire bites,chews and discards the mud they have already bit more and more, maybe try the less aggressive tires off the other machine and see if your perceived hp feels better and perhaps even a roost.

[dirtdobber]

Thanks JB and AJ. I'm not so worried about top end speed. The Yanmar is spinning at 3450 WOT so that's enough for me. What I'm really after is a shift to higher gear by the clutch when under a load. AJ I agree the deep lug tires have a lot of bite, and if they don't spin that's fine by me. But, the clutch should be looking for a higher gear and at least load the engine somewhat. If the new clutch weights don't do it then it is what it is, but my gut tells me performance should be better than what I have now, particularly since it will slip the belt when it should spin the tires. The drive clutch just isn't providing the bite.

On another note, I have a spare (old) drive clutch that I was going to build. But, after tearing it down, I don't like the wear pattern on the sheaves. I'm calling this one junk.
Clutch sheave.jpg

[racerone3]

Thanks JB and AJ. I'm not so worried about top end speed. The Yanmar is spinning at 3450 WOT so that's enough for me. What I'm really after is a shift to higher gear by the clutch when under a load. AJ I agree the deep lug tires have a lot of bite, and if they don't spin that's fine by me. But, the clutch should be looking for a higher gear and at least load the engine somewhat. If the new clutch weights don't do it then it is what it is, but my gut tells me performance should be better than what I have now, particularly since it will slip the belt when it should spin the tires. The drive clutch just isn't providing the bite.

On another note, I have a spare (old) drive clutch that I was going to build. But, after tearing it down, I don't like the wear pattern on the sheaves. I'm calling this one junk.
[ATTACH=CONFIG]18509[/ATTACH]

If your going to junk it, I would take it off your hands

[dirtdobber]

Racer let me get my other one built and you can have it for the cost of shipping. The rollers/weights are rusty and about to fall apart. Not sure when I'm going to get it done but hopefully soon.

[racerone3]

awesome, just let me know and no rush. I just need something to limp a machine out of the woods if I even have another massive failure. the last one happened within 1/8 mile of my trailer

[ARGOJIM]

Thanks JB and AJ. I'm not so worried about top end speed. The Yanmar is spinning at 3450 WOT so that's enough for me. What I'm really after is a shift to higher gear by the clutch when under a load. AJ I agree the deep lug tires have a lot of bite, and if they don't spin that's fine by me. But, the clutch should be looking for a higher gear and at least load the engine somewhat. If the new clutch weights don't do it then it is what it is, but my gut tells me performance should be better than what I have now, particularly since it will slip the belt when it should spin the tires. The drive clutch just isn't providing the bite.

On another note, I have a spare (old) drive clutch that I was going to build. But, after tearing it down, I don't like the wear pattern on the sheaves. I'm calling this one junk.
[ATTACH=CONFIG]18509[/ATTACH]

I might try to stick the machine in the mud with the engine cover off, sit on the hood like we often see Fmints, watch what the clutches are doing. I know you have been spring switching, and with the conflicting information here and there, how far a twist you went? 1.2.3? I think last time I green sprung a 2 stroke I needed to be at 1-1/2 bumps due to clocking.

[mightymaxIV]

Are those Mud Bug Tires? If so I have seen them on other machines and they do swim a little, not great but they do move, they are also pretty good in the mud, Lee used to have a set on his Argo Frontier.

[dirtdobber]

The tires are GBC gators. They don't swim at all.