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Petel
| Posted on Monday, July 08, 2002 - 10:03 am: |
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Thanks for that Aaron. Went to a Buell meet yesterday at the National Motorcycle Museum in Birmingham,England. Most of the bikes there were running US 61t rear pulleys with no problems regarding belt adjustment etc. So that`s the way I`m going. Now to see if I can get cheaper by going direct to the US. I`ll try Sporttwin as suggested. Thanks. Petel.![](http://www.badweatherbikers.com/buell/clipart/thumbsup3.gif) |
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Petel
| Posted on Monday, July 08, 2002 - 10:34 am: |
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OK. Just looked at the Sporttwin site and can`t find a listing for rear sprockets. Also all of the products are listed as "Not available outside the US". Can anyone tell me how much they expect to pay for a standard US 61t sprocket? Am I being ripped off in the UK expecting to pay £145 ($200ish) for the same product? If so where can I get one shipped from the US? Come on guys, us Brits gave you the Spice girls,Jaguar motorcars and some other very useless things Return the favour Ta. Petel. |
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Aaron
| Posted on Monday, July 08, 2002 - 10:58 am: |
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34927-94Y, $140 |
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Aaron
| Posted on Monday, July 08, 2002 - 11:10 am: |
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Right now you have a 29/55, which is a 1.89 final With the 29/61, you'd have a 2.1. Some Buells used to come this way, including my S2. It sucked, too tall. US spec is 27/61 (2.26). It's reasonable. Could be a tick shorter. 26T front pulleys are available aftermarket for about $175. You might run out of belt adjustment with a 27/55 or a 26/55. |
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Jmartz
| Posted on Monday, July 08, 2002 - 10:39 pm: |
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AAron: Do you know by how much will the wheelbase be increased when going from a 27 to a 26? Also the belt rubs the swingarm block ever so slightly with the 27, any issues on that front with the 26? If 4000 rpm gave you 80 mph will a 26 front puley yield, 78? |
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Aaron
| Posted on Monday, July 08, 2002 - 11:54 pm: |
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"Do you know by how much will the wheelbase be increased when going from a 27 to a 26?" It seems like it'd be easy to calculate. The belt goes around roughly half the pulley (actually slightly less than half, but close enough), so 1 tooth less on the pulley gives half a tooth pitch shorter path around the pulley for the belt, right? And half of that shorter path will end up on the top strand and half on the bottom strand. So unless I'm missing something, one tooth less on the front pulley will lengthen the wheelbase by 1/4 of the tooth pitch. "Also the belt rubs the swingarm block ever so slightly with the 27, any issues on that front with the 26?" Well, lessee ... since diameter = (circumference / pi), dropping the circumference by a 27th also drops the diameter by a 27th. But half of that will get applied to the top of the pulley and half to the bottom. So I *think* the top strand will drop down, at the pulley, by 1/54th of the diameter of the 27T pulley. Drop at the swingarm would be slightly less. That becomes a triangle problem, easily solved with trig if we had all the numbers. "If 4000 rpm gave you 80 mph will a 26 front puley yield, 78?" Seems like it'd be 26/27ths ... 77mph. I dunno, ask me when I'm awake, I may look at this tomorrow and think "what was I thinking?" |
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Captpete
| Posted on Tuesday, July 09, 2002 - 12:06 am: |
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Aaron, “With the 29/61, you'd have a 2.1. Some Buells used to come this way, including my S2. It sucked, too tall.” I have just gone to 29/61 gearing on my S1W because at 101 rwhp: 1. Opening the throttle in 1st gear (at sea level) would start the bike into a back flip that happened so quickly that the one and only time I did it, I nearly completed the maneuver before I could get it shut down. (Where’s the videographer when you need him?) 2. After seizing 4 engines in a row, I thought it might be a good idea to drop the cruising rpm’s a tad. (I know, I should spring for a Baker) Your comment begs the question: You found the gearing too tall for what reasons/conditions? (Stock engine at high altitude?) C P |
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Petel
| Posted on Tuesday, July 09, 2002 - 05:20 am: |
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With the standard UK 29/55 I`m cruising at 80mph at 3000rpm . This is about my normal cruising speed here in the UK but the engine is just coming alive at these revs. By going to a US 61t rear I reacon that at 80mph it`ll be at about 3500rpm. Much healthier for the engine and I wont have to drop a gear to overtake on motorways and fast dualcarrigeways. It may seem too tall for US cruising but it`ll suit the UK roads just fine, any shorter gearing and I`ll be swapping cogs too often . Petel. |
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V2win
| Posted on Tuesday, July 09, 2002 - 07:56 am: |
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Petel, 29/61 @ 80mph = approx 4000rpm on my bike. |
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Aaron
| Posted on Tuesday, July 09, 2002 - 08:40 am: |
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Captain Pete, you hit the nail on the head ... too much wheelie power is not a big problem up here. I'm giving up 20% hp&tq just because of where I live. But, I often cruise at 4000rpm and have never seized a motor. |
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Jmartz
| Posted on Tuesday, July 09, 2002 - 12:28 pm: |
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AAron: Have you tried the 26 on one of your bikes? |
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Petel
| Posted on Tuesday, July 09, 2002 - 01:32 pm: |
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V2win. Just been searching and this link: http://www.ukbeg.com/technical/wwks.htm Works it out as 3700rpm = 80mph which will suit me just fine Petel. |
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Aaron
| Posted on Tuesday, July 09, 2002 - 02:58 pm: |
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Jose: no, but I'd like to. |
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Jmartz
| Posted on Tuesday, July 09, 2002 - 03:08 pm: |
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I'l buy one and let you know... |
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S3t_Mitch
| Posted on Tuesday, July 09, 2002 - 06:58 pm: |
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I thought I'd just throw in a bit of experience to the pulley situation. I have a 99 S3T (US-Version). I live in Europe, which means I was cruising down the highways at about 100mph+ or near to 5000rpm. It seemed like I was having alot of extra maintenance running at the higher revs so often. So, I bought a European rear pulley (55 tooth...I think). Anyway, I am guessing the speedo is off by around 9% when I use the Euro pulley. But, 90 mph indicated shows about 4300rpm, doing the math that's a respectable 95-100mph. The bike seems to like that 4000-4300 range, or I like having less things to repair! For track days or "wheelie days" I throw my US pulley on for the extra little umpfh. |
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S3t_Mitch
| Posted on Tuesday, July 09, 2002 - 07:00 pm: |
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Hey Pete, I just saw that you are looking for a US rear pulley. I have 2. Spit me an email if you want it. (invincimitch@yahoo.com) |
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Jmartz
| Posted on Wednesday, July 10, 2002 - 02:39 pm: |
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Ok AAron its on oder, shipping today. Will install this weekend an report, if it gets here (should as its coming from Michigan)... |
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Mikej
| Posted on Wednesday, July 10, 2002 - 02:41 pm: |
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Jmartz, Who'd you order it from, if you don't mind me asking? |
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Aaron
| Posted on Wednesday, July 10, 2002 - 02:55 pm: |
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You should've had it shipped to my house, I would've been glad to test it and give you a full report! |
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Jmartz
| Posted on Wednesday, July 10, 2002 - 09:33 pm: |
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Mike: I gott it from the "manufacturer", Baker. Since Andrews makes their transmissions I guess some else makes their pulleys... |
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Jmartz
| Posted on Thursday, July 11, 2002 - 08:16 am: |
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Aaron: I can see ypou have been in a festive mood recently... José |
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Aaron
| Posted on Thursday, July 11, 2002 - 08:32 am: |
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My new engine is starting to show up ![](http://www.badweatherbikers.com/buell/clipart/thumbsup3.gif) |
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Jmartz
| Posted on Thursday, July 11, 2002 - 09:48 am: |
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Aaron: I am also feeling quite happy in my search for a replacement bike. What I really would like to do is to transform the Buell in the monster bike we have often discussed but frankly, the parts don't seem to be available and all that aftermarket stuff seems to be made a lot heavier perhaps intended for drag racing. I went to the Yamaha store and could not bring myself to purchase the R1. There is no doubt now, I am in full recognition of the fact, that I am destined to always own an overpriced, overweight and underpowered 1950's technology bike. This weekend I'm looking at a 916... |
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Jmartz
| Posted on Saturday, July 13, 2002 - 02:03 pm: |
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Ok Aaron, its here (I love buying things from other than CA)! Will report on Monday on the increase/decrease in performance and whether the betlt eats the (or is eaten by) the swing arm block. Don't you hate when you finance your own R & D? José |
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Jmartz
| Posted on Saturday, July 13, 2002 - 02:11 pm: |
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Oh, I forgot to mention the construction design. The thing is ultralight, I was amazed when I picked up the box. It machined from a single piece of aliminum and has a hard anodize finish. Most interesting, there is no steel insert on the spline area. ![](http://www.badweatherbikers.com/buell/clipart/rolleyes.gif) |
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Jmartz
| Posted on Saturday, July 13, 2002 - 08:19 pm: |
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With rain all day I have not been able to ride the bike. One thing I noticed is that when tightening the stock cast iron pulley once you reach bottom on the nut that was it. With this aluminum one I reached bottom several times finally leaving a bit more output shaft than before, as if the material had been compressed a few thousandths (ca. 25 - 30). Alignment appears fine. What is the final factory recommended belt slack? I have it at 1 7/8 unloaded. |
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Jmartz
| Posted on Monday, July 15, 2002 - 02:26 pm: |
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Report, 26 tooth Baker transmission pulley: Bike accelerates a tiny bit quicker and feels stronger all around. Sweet spot (4000 rpm) speed is down from 78 to 75, a good thing considering the avoidance of criminal acts. In general I recommend it even if just as a replacement of the "tractor" device that comes stock. I'm sure that durability will be affected as stress on this part is high and aluminum is weaker than steel. Personally I don't have a prblem replacing it at shorter intervals in the interest of weight reduction and performance enhacement. I my calculations are correct the difference is about 3.5% |
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Lake_Bueller
| Posted on Wednesday, July 17, 2002 - 01:33 pm: |
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Update on "squeeking" noises....Took the bike in just before my last BRAG meeting at Hal's H-D in New Berlin. Mikey (the lead tech) came out to give the bike a quick inspection. It seems the squeeking is being caused by the belt itself. He was explaining how the ozone can affect the rubber. This would explain why I had the same problem develop in August of last year (hottest temps; highest humidity). They could find the problem at the that time. They replaced the pulley and the noise stopped. As soon as the temps & humidity dropped to tolerable levels, the squeeking stopped immediately. Has anyone ever had the happen to them? |
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Hootowl
| Posted on Wednesday, July 17, 2002 - 01:44 pm: |
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Yes. My dealer told me that the belts lose some of their natural oils over time and begin to squeak, especially when ridden in wet weather a lot. I was living in Seattle at the time, riding to work every day. It quit doing it on its own after a while. |
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Captlusk
| Posted on Thursday, July 18, 2002 - 01:33 am: |
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I have the same sqeaking problem. It comes and goes and definetly seems to do it more when the temp drops. I live in Seattle so the bike gets ridden in the rain alot. I'm glad I read this thread, I was begining to think that I was the only one experiencing this. |
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