Already picked up a Jaws trail can, sounds awesome and great build quality. Thinking I'm going to be getting a pipe from them soon as well. I've noticed I'm only pulling on average about 7900-8100 rpm riding around 2000m, engine has about 11hrs on it and I'm currently running stock weights. I've heard good things about the Jaws pipe, but I'm wondering what the "sweet spot" is for this motor, what the rpm increase will be after the mod and if I'll have to put different weights in? Thanks.
Considering getting a Jaws pipe and a question about clutch weights.
- Thread starter powsmash
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R
Reddragon800
Well-known member
Stock RPM should be at 8250. with a pipe 8400 rpm. You should be getting a bit more RPM for that elevation. Put a couple Derlin washers in your secondary. Helps a lot. The pipe is supposed to add 5-7 hp. So, you should be able to run 66 gram weights a 2000 meters.
With slp pipe and stock clutching other than weights i ran 10-72's up to 4000'
R
Reddragon800
Well-known member
The MTX weights act different then the Polaris weights. I'm assuming that you also put in there heavier primary spring. I don't understand why guys buy the SLP clutching. putting a heavier primary spring and then adding more weight to overcome that spring. Seems like they have a good sales team!
64 gram weights are for 6-8000 feet. a pipe should be able to pull the 66 gram weights for that elevation.
64 gram weights are for 6-8000 feet. a pipe should be able to pull the 66 gram weights for that elevation.
Running 76 grams in mtx weights at 4000'
8400 rpm
45mph trackspeed at turnout.....
The 10 series poo weights sucked.
Greg from Jaws says this pipe works best at 8400-8500 RPM.
I had mine out for the first time last weekend with the Jaws pipe and stock can. I heard all these stories about guys running a million grams with a pipe, so I started with 10-68s at 6500-9000 feet. RPM was low-8000-8100. Then I tried 10-66s. It was better- I got 8250 or so, still low. I didn't even think to bring 10-64s that day, but I think that's what it really needed. It was pretty warm, with soft snow on top but fairly hard stuff down 18" or so.
When you think about it, adding 10 h.p. to the engine is equivalent to 6%. That, in turn, is equivalent to about 2000 feet in elevation (3% power loss per 1000 feet of elevation gain). So your piped sled at 7000 feet would run like a stocker at 5000. I don't see how it would be possible to spin way more weight, like an extra 4 or 6 grams, with only a 10 h.p. gain, which in itself is probably optimistic.
Of course, a different weight profile, like an MTX, MDS, Bikeman, Rooster, etc. weight is a totally different ballgame. You can't compare a 68 gram 10 series weight to a 68 gram MTX.
As a side note, my track speed was definitely up with this pipe, even when I was running real low on RPM. And the motor felt great- pulled hard. My buddy was there with his SLP-MTX pipe setup, and I felt that seat of the pants, mine pulled harder, especially at low RPM. I don't really put much stock in this, though, you have to run a hill together, and we didn't end up doing so- we were hardcore tree bashing all weekend!
I also tried the primary spring spacer that comes with the pipe, and didn't see any difference. In theory it has to raise the engagement RPM, but I didn't really take the time to evaluate it.
I had mine out for the first time last weekend with the Jaws pipe and stock can. I heard all these stories about guys running a million grams with a pipe, so I started with 10-68s at 6500-9000 feet. RPM was low-8000-8100. Then I tried 10-66s. It was better- I got 8250 or so, still low. I didn't even think to bring 10-64s that day, but I think that's what it really needed. It was pretty warm, with soft snow on top but fairly hard stuff down 18" or so.
When you think about it, adding 10 h.p. to the engine is equivalent to 6%. That, in turn, is equivalent to about 2000 feet in elevation (3% power loss per 1000 feet of elevation gain). So your piped sled at 7000 feet would run like a stocker at 5000. I don't see how it would be possible to spin way more weight, like an extra 4 or 6 grams, with only a 10 h.p. gain, which in itself is probably optimistic.
Of course, a different weight profile, like an MTX, MDS, Bikeman, Rooster, etc. weight is a totally different ballgame. You can't compare a 68 gram 10 series weight to a 68 gram MTX.
As a side note, my track speed was definitely up with this pipe, even when I was running real low on RPM. And the motor felt great- pulled hard. My buddy was there with his SLP-MTX pipe setup, and I felt that seat of the pants, mine pulled harder, especially at low RPM. I don't really put much stock in this, though, you have to run a hill together, and we didn't end up doing so- we were hardcore tree bashing all weekend!
I also tried the primary spring spacer that comes with the pipe, and didn't see any difference. In theory it has to raise the engagement RPM, but I didn't really take the time to evaluate it.
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