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Which Dr. Pulley Sliders?

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bmwben

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I want to get a set of Dr. Pulley rollers and sliders for my 2014 c650gt. I know what size rollers to get but there are two part numbers for the sliders: SP33020AE and SP3020AH. Does anyone know which is correct for a 2014 GT? AE or AH?
 
bmwben said:
I want to get a set of Dr. Pulley rollers and sliders for my 2014 c650gt. I know what size rollers to get but there are two part numbers for the sliders: SP33020AE and SP3020AH. Does anyone know which is correct for a 2014 GT? AE or AH?
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I think the part numbers you're asking about are SP3020AE and SP3020AH. If so, those aren't rollers; they're the sliding pieces for the variator. And it's hard to say which one you need. Your best bet is to compare the measurements with the BPNW webpage and order the right one -- they're not interchageable.
 
Just an FYI here. I have a Yamaha YP 400 scooter. The OEM rollers had flat spots at 18 k miles. I experimented with different weight ( lighter) Dr.Pully sliders (14 gram) and ran higher RPM, although I thought this would be -ok- for better take off anyway, I spend too much time at hwy speeds ( 70-80mph). So instead I bought the standard weight DR.Pully sliders (16 gr.) but added .75 gram more weight by filling the center of the brass insert with epoxy, then grinding out w/dremel tool. Used a $20 scale from HF. Got all (8) to weigh exactly the same. ( 16.748 GM) .Now besides smoother Pulling, it cruises at a lower RPM at higher speeds than the OEM weight rollers and I am very happy with them.
 
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DPaul said:
Asking for a follow up on the Dr.Pulley sliding rollers. Hopefully you've had them installed for a while? How do you like them?
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I've put about 700 miles on my 2013 since I've installed the Dr Pulley sliders, guides and belt. Acceleration is slightly quicker, RPM may be slightly higher at cruising speed on the interstate, clutch engagement seems smoother and quicker, all in all I like it, but it isn't "earth shattering" difference, just a little quicker, smoother and mid range seems stronger. An improvement but not something I would tear all apart to do just for this, I did mine with the belt at 21,000 miles, I could have gone another belt life on the rollers, but i had already purchased the sliders.
 
I used the 30g, now at close to 1200 miles with rollers, I do like them but as I said above, alone, just not worth the effort (to me) but it is an improvement over stock and worth having the parts on hand when replacing the belt.
 
Pappy13 said:
I used the 30g, now at close to 1200 miles with rollers, I do like them but as I said above, alone, just not worth the effort (to me) but it is an improvement over stock and worth having the parts on hand when replacing the belt.
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Hi, just wanted to ask if you installed by yourself? I was wondering if mistake can be done as I had a dealer install mine today, 28gr and the rpm is too high. Around 5k rpm all the time. Even on high speed 60-70mph. Also the clutch disengage at 15mph.
Thanks, Ben
 
Bojan Gjoshevski said:
Hi, just wanted to ask if you installed by yourself? I was wondering if mistake can be done as I had a dealer install mine today, 28gr and the rpm is too high. Around 5k rpm all the time. Even on high speed 60-70mph. Also the clutch disengage at 15mph.
Thanks, Ben
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I did install myself, and YES, they can be installed wrong.
 
In case they are correct, does the variator position matter? I’ve seen a video where when they replace it they mark it with a line. Maybe something out of sync?? … I suspect they did something wrong as this is a BMW dealership but who knows.
 
When you see the youtube of the installers marking the variator it is to track the range of the belt, with sliders the belt can move a little more to the center and a little farther out from the center, ideally, the effects of a higher "gear" moving from stop and a lower "gear" at cruise speed. In practice, the flat sides of the slider do let the variator compress more but i think the sliders are very slightly smaller than the rollers so when they move to the outside of the variator there may not be as much travel for the belt. I'm very new to this system and I'm trying to study it to better understand it so take this with a grain of salt, I do understand the principle, and probably don't fully grasp the practice yet.
 
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